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1
Inheritance
5
Pathophys.
10
Phenotypes
19
Pathograph
1
Genes
6
Treatments
3
Differentials
2
Deep Research
👪

Inheritance

1
Autosomal recessive HP:0000007
CD27-related lymphoproliferative and immune disorder is caused by biallelic TNFRSF7/CD27 variants, most often homozygous loss-of-function alleles but also compound heterozygous variant combinations.
Autosomal recessive inheritance
Show evidence (2 references)
PMID:22801960 SUPPORT Human Clinical
"We report the simultaneous confirmation of human CD27 deficiency in 3 independent families (8 patients) due to a homozygous mutation (p. Cys53Tyr) revealed by whole exome sequencing, leading to disruption of an evolutionarily conserved cystein knot motif of the transmembrane receptor."
Multiple unrelated families with homozygous CD27 variants support autosomal recessive inheritance.
PMID:25843314 SUPPORT Human Clinical
"4 novel mutations were identified: homozygous missense c.G287A/p.C96Y"
The expanded mutational spectrum shows that disease results from biallelic CD27 loss-of-function genotypes.

Pathophysiology

5
Loss of CD27-CD70 costimulation
Biallelic CD27/TNFRSF7 variants reduce or abolish cell-surface CD27 and disrupt CD27-CD70 signaling. This removes a key TNF-receptor-family costimulatory input required for effective adaptive antiviral responses.
CD8-positive alpha-beta T cell link
CD27 link
T cell costimulation link ↓ DECREASED
Show evidence (2 references)
PMID:25843314 SUPPORT Human Clinical
"Expression of cell-surface and soluble CD27 was significantly reduced in patients and heterozygous family members."
Human patient immunophenotyping shows that TNFRSF7 variants reduce CD27 expression, establishing the primary receptor-level defect.
PMID:33827115 SUPPORT Model Organism
"This suggests that CD27 is not required for all CD8+ T-cell expansions and cytotoxicity but is required for a subset of CD8+ T-cell responses that protect us from EBV pathology."
Humanized-mouse experiments directly support CD27 as a protective costimulatory signal for EBV-specific CD8 T-cell immunity.
Reduced innate cytotoxic lymphocyte function
In severely affected CD27-deficient patients, innate cytotoxic lymphocyte compartments are also compromised, with reduced NK-cell function and fewer invariant NKT cells further weakening antiviral immune surveillance.
natural killer cell link
natural killer cell mediated cytotoxicity link ↓ DECREASED
Show evidence (1 reference)
PMID:22801960 SUPPORT Human Clinical
"In severely affected patients, numbers of iNKT cells and NK-cell function were reduced."
Human CD27 deficiency can impair innate cytotoxic lymphocyte function in addition to adaptive antiviral immunity, broadening the mechanistic basis of EBV susceptibility.
Impaired EBV-specific cytotoxic T-cell immunity
CD27 deficiency compromises expansion and effector differentiation of protective EBV-specific CD8-positive T cells, especially lytic antigen responses, allowing persistent EBV infection and defective clearance of EBV-transformed B cells.
CD8-positive alpha-beta T cell link
T cell proliferation link ↓ DECREASED T cell activation link ↓ DECREASED
Show evidence (2 references)
PMID:32603431 SUPPORT Human Clinical
"Detailed immunological characterization revealed aberrant generation of memory B and T cells, including a paucity of EBV-specific T cells, and impaired effector function of CD8+ T cells, thereby providing mechanistic insight into cellular defects underpinning the clinical features of disrupted..."
The multinational cohort directly links CD27 deficiency to deficient EBV-specific T-cell generation and impaired CD8 effector function.
PMID:33827115 SUPPORT Model Organism
"While overall CD8+ T-cell expansion and composition are unaltered after antibody blocking of CD27, only some EBV-specific CD8+ T-cell responses, exemplified by early lytic EBV antigen BMLF1-specific CD8+ T cells, are inhibited in their proliferation and killing of EBV-transformed B cells."
This functional model shows that CD27 signaling is specifically required for the EBV-directed CD8 response that restrains transformed B cells.
Impaired T cell-dependent humoral immunity
CD27 deficiency impairs T cell-dependent B-cell responses, memory B-cell generation, and antibody production. This produces hypogammaglobulinemia and contributes to recurrent infection susceptibility.
B cell link memory B cell link
B cell differentiation link ↓ DECREASED isotype switching link ↓ DECREASED
Show evidence (3 references)
PMID:22197273 SUPPORT Human Clinical
"Immunologically, lack of CD27 expression was associated with impaired T cell-dependent B-cell responses and T-cell dysfunction."
The original CD27-deficient sibling pair establishes impaired helper dependent B-cell responses as a core immune mechanism.
PMID:22801960 SUPPORT Human Clinical
"Phenotypes varied from asymptomatic memory B-cell deficiency (n=3) to EBV-associated hemophagocytosis and lymphoproliferative disorder (LPD; n=3) and malignant lymphoma (n=2; +1 after LPD)."
Some affected individuals initially present with isolated memory B-cell deficiency, showing that impaired post-germinal-center B-cell maturation is a core manifestation even before overt EBV-driven complications.
PMID:22801960 SUPPORT Human Clinical
"Following EBV infection, hypogammaglobulinemia developed in at least 3 of the affected individuals, while specific anti-viral and anti-polysaccharide antibodies and EBV-specific T-cell responses were detectable."
This cohort links CD27 deficiency to acquired humoral failure after EBV infection, including hypogammaglobulinemia and deficient immune memory.
EBV-driven lymphoproliferation and hyperinflammation
Loss of CD27-mediated immune surveillance leaves EBV insufficiently controlled, predisposing to lymphoproliferative disease, HLH-like hyperinflammation, and malignant lymphoma.
B cell link
lymphocyte proliferation link ↑ INCREASED inflammatory response link ↑ INCREASED
Show evidence (2 references)
PMID:22801960 SUPPORT Human Clinical
"Since homozygosity mapping and exome sequencing did not reveal additional modifying factors, our findings suggest that lack of functional CD27 predisposes towards a combined immunodeficiency associated with potentially fatal EBV-driven hemo-phagocytosis, lymphoproliferation, and lymphoma development."
The early CD27-deficiency cohort directly ties the upstream signaling defect to EBV-driven lymphoproliferation, hyperinflammation, and lymphoma.
PMID:32603431 SUPPORT Human Clinical
"Lymphoproliferation and lymphoma were the main clinical manifestations (70% and 43%, respectively), and 9 of the CD27-deficient patients developed HLH."
The largest CD27/CD70 cohort quantifies the major EBV-driven clinical outcomes and confirms HLH as a recurrent complication in CD27 deficiency.

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for CD27-related lymphoproliferative and immune disorder Interactive directed graph showing how pathophysiology mechanisms, phenotypes, genetic factors and variants, experimental models, environmental triggers, and treatments relate through causal and linked edges.

Phenotypes

10
Blood 3
Hypogammaglobulinemia Decreased circulating immunoglobulin concentration (HP:0004313)
Show evidence (2 references)
PMID:22197273 SUPPORT Human Clinical
"The index patient was hypogammaglobulinemic, and immunoglobulin replacement therapy was initiated."
The original sibling pair directly documents clinically relevant hypogammaglobulinemia.
PMID:22801960 SUPPORT Human Clinical
"Following EBV infection, hypogammaglobulinemia developed in at least 3 of the affected individuals, while specific anti-viral and anti-polysaccharide antibodies and EBV-specific T-cell responses were detectable."
Additional CD27-deficient patients developed hypogammaglobulinemia after EBV infection, showing this is a recurring humoral phenotype.
Lymphoproliferative disorder Lymphoproliferative disorder (HP:0005523)
Show evidence (2 references)
PMID:22801960 SUPPORT Human Clinical
"Phenotypes varied from asymptomatic memory B-cell deficiency (n=3) to EBV-associated hemophagocytosis and lymphoproliferative disorder (LPD; n=3) and malignant lymphoma (n=2; +1 after LPD)."
This case series explicitly documents EBV-associated lymphoproliferative disorder in multiple CD27-deficient patients.
PMID:32603431 SUPPORT Human Clinical
"Lymphoproliferation and lymphoma were the main clinical manifestations (70% and 43%, respectively), and 9 of the CD27-deficient patients developed HLH."
The larger cohort confirms lymphoproliferation as the most frequent major disease manifestation.
Lymphoma Lymphoma (HP:0002665)
Show evidence (2 references)
PMID:25843314 SUPPORT Human Clinical
"EBV-associated lymphoproliferative disease/hemophagocytic lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections were the predominant clinical features."
The expanded CD27-deficiency cohort identifies Hodgkin lymphoma as a predominant disease manifestation.
PMID:32603431 SUPPORT Human Clinical
"Our data highlight the marked predisposition to lymphoma of both CD27- and CD70-deficient patients."
The largest natural-history series emphasizes lymphoma as a defining risk of disrupted CD27/CD70 signaling.
Eye 1
Uveitis Uveitis (HP:0000554)
Show evidence (2 references)
PMID:25843314 SUPPORT Human Clinical
"EBV-associated lymphoproliferative disease/hemophagocytic lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections were the predominant clinical features."
The expanded clinical cohort explicitly lists uveitis among the predominant features of CD27 deficiency.
PMID:32603431 SUPPORT Human Clinical
"Twenty-one patients (43%) developed autoinflammatory features including uveitis, arthritis, and periodic fever."
The multinational cohort confirms that uveitis is a common autoinflammatory manifestation in disrupted CD27/CD70 signaling.
Immune 2
Combined immunodeficiency Combined immunodeficiency (HP:0005387)
Show evidence (1 reference)
PMID:22801960 SUPPORT Human Clinical
"Since homozygosity mapping and exome sequencing did not reveal additional modifying factors, our findings suggest that lack of functional CD27 predisposes towards a combined immunodeficiency associated with potentially fatal EBV-driven hemo-phagocytosis, lymphoproliferation, and lymphoma development."
The defining syndrome is explicitly described as a combined immunodeficiency caused by lack of functional CD27.
Recurrent infections Recurrent infections (HP:0002719)
Show evidence (1 reference)
PMID:25843314 SUPPORT Human Clinical
"EBV-associated lymphoproliferative disease/hemophagocytic lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections were the predominant clinical features."
Recurrent infections are explicitly listed among the predominant clinical features in the expanded CD27-deficiency cohort.
Metabolism 1
Recurrent fever Recurrent fever (HP:0001954)
Show evidence (1 reference)
PMID:32603431 SUPPORT Human Clinical
"Twenty-one patients (43%) developed autoinflammatory features including uveitis, arthritis, and periodic fever."
This cohort shows that recurrent fever is a common autoinflammatory manifestation in disrupted CD27/CD70 signaling.
Musculoskeletal 1
Arthritis Arthritis (HP:0001369)
Show evidence (1 reference)
PMID:32603431 SUPPORT Human Clinical
"Twenty-one patients (43%) developed autoinflammatory features including uveitis, arthritis, and periodic fever."
The multinational cohort directly documents arthritis as part of the autoinflammatory spectrum of CD27 deficiency.
Other 2
Persistent symptomatic EBV viremia Chronic active Epstein-Barr virus infection (HP:0032204)
Show evidence (2 references)
PMID:22197273 SUPPORT Human Clinical
"Both patients had persistent symptomatic EBV viremia."
The original affected siblings establish persistent symptomatic EBV viremia as a hallmark disease feature.
PMID:32603431 SUPPORT Human Clinical
"The majority of patients (90%) were EBV+ at diagnosis"
The multinational series shows that EBV infection is present in nearly all diagnosed patients even when the presentation is not classic mononucleosis.
Hemophagocytosis Hemophagocytosis (HP:0012156)
Show evidence (1 reference)
PMID:22801960 SUPPORT Human Clinical
"Phenotypes varied from asymptomatic memory B-cell deficiency (n=3) to EBV-associated hemophagocytosis and lymphoproliferative disorder (LPD; n=3) and malignant lymphoma (n=2; +1 after LPD)."
Hemophagocytosis is explicitly reported as an EBV-associated complication in CD27 deficiency.
🧬

Genetic Associations

1
CD27 (CAUSATIVE)
Show evidence (2 references)
PMID:25843314 SUPPORT Human Clinical
"4 novel mutations were identified: homozygous missense c.G287A/p.C96Y"
This study expands the disease-causing TNFRSF7/CD27 variant spectrum and confirms CD27 as the causal gene.
PMID:22801960 SUPPORT Human Clinical
"We report the simultaneous confirmation of human CD27 deficiency in 3 independent families (8 patients) due to a homozygous mutation (p. Cys53Tyr) revealed by whole exome sequencing, leading to disruption of an evolutionarily conserved cystein knot motif of the transmembrane receptor."
Independent families with the same homozygous missense variant confirm CD27 deficiency as a monogenic disorder.
💊

Treatments

6
Immunoglobulin replacement therapy
Action: immunoglobulin replacement therapy Ontology label: immunoglobulin infusion therapy MAXO:0001480
Immunoglobulin replacement is supportive treatment for the antibody deficiency component of CD27 deficiency.
Target Phenotypes: Hypogammaglobulinemia
Show evidence (2 references)
PMID:22197273 SUPPORT Human Clinical
"The index patient was hypogammaglobulinemic, and immunoglobulin replacement therapy was initiated."
This directly documents immunoglobulin replacement as supportive care for CD27-deficient hypogammaglobulinemia.
PMID:25843314 SUPPORT Human Clinical
"Immunoglobulin substitution therapy was administered in 5 of the newly diagnosed cases."
The expanded cohort confirms that immunoglobulin replacement is a common supportive treatment in clinical practice.
Allogeneic hematopoietic stem cell transplantation
Action: allogeneic hematopoietic stem cell transplantation MAXO:0001479
Allogeneic HSCT is the main potentially curative treatment for severe CD27-related disease, especially when lymphoma, HLH, or refractory EBV-driven immune dysregulation develops.
Target Phenotypes: Lymphoma
Show evidence (2 references)
PMID:32603431 SUPPORT Human Clinical
"Nineteen patients underwent allogeneic hematopoietic stem cell transplantation (HSCT) prior to adulthood predominantly because of lymphoma, with 95% survival without disease recurrence."
The multinational series shows excellent HSCT outcomes and supports early use for severe lymphoma-predominant disease.
PMID:22801960 SUPPORT Human Clinical
"Two of 8 patients died, 2 others underwent allogeneic hematopoietic stem cell transplantation successfully, and one received anti-CD20 (rituximab) therapy repeatedly."
Early case-series experience already showed successful allogeneic HSCT in severe CD27 deficiency.
Rituximab
Action: rituximab therapy Ontology label: Pharmacotherapy NCIT:C15986
Agent: rituximab
Anti-CD20 monoclonal antibody therapy has been used as adjunctive or bridge treatment for severe EBV-driven CD20-positive B-cell lymphoproliferation or lymphoma in CD27 deficiency.
Target Phenotypes: lymphoproliferative disorder Lymphoma
Show evidence (1 reference)
PMID:22801960 SUPPORT Human Clinical
"Two of 8 patients died, 2 others underwent allogeneic hematopoietic stem cell transplantation successfully, and one received anti-CD20 (rituximab) therapy repeatedly."
The early CD27-deficiency case series documents repeated rituximab use as adjunct treatment for severe EBV-driven disease.
EBV and malignancy surveillance
Action: supportive care MAXO:0000950
Longitudinal follow-up should monitor EBV burden, lymphadenopathy, cytopenias, systemic inflammatory features, and symptoms concerning for lymphoproliferative disease or lymphoma.
Target Phenotypes: persistent symptomatic Epstein-Barr virus viremia Lymphoma
Show evidence (1 reference)
PMID:32603431 SUPPORT Human Clinical
"The majority of patients (90%) were EBV+ at diagnosis, but only ∼30% presented with infectious mononucleosis. Lymphoproliferation and lymphoma were the main clinical manifestations (70% and 43%, respectively)"
EBV positivity and frequent lymphoproliferation/lymphoma support ongoing viral and malignancy surveillance.
HLH- and lymphoma-directed acute management
Action: pharmacotherapy MAXO:0000058
Suspected HLH, EBV-driven lymphoproliferative disease, or lymphoma requires urgent hematology/oncology-directed treatment using disease-standard protocols, with infection support and consideration of HSCT once acute disease is controlled.
Target Phenotypes: Hemophagocytosis Lymphoma
Show evidence (2 references)
PMID:32603431 SUPPORT Human Clinical
"Lymphoproliferation and lymphoma were the main clinical manifestations (70% and 43%, respectively), and 9 of the CD27-deficient patients developed HLH."
Frequent severe lymphoproliferative, malignant, and HLH complications support explicit acute specialty-directed management.
PMID:25843314 SUPPORT Human Clinical
"EBV-associated lymphoproliferative disease/hemophagocytic lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections were the predominant clinical features."
The clinical spectrum includes the acute complications that require disease-specific treatment rather than only immunoglobulin replacement.
Vaccine planning for combined immunodeficiency
Action: vaccination MAXO:0001017
Vaccination decisions should be individualized with immunology and infectious-disease input. Non-live vaccines may be indicated, whereas live-attenuated vaccines should be deferred or avoided when clinically significant cellular or combined immunodeficiency is present.
Target Phenotypes: Combined immunodeficiency
Show evidence (2 references)
"Administration of live vaccines might need to be deferred until immune function has improved."
CDC altered-immunocompetence guidance supports live-vaccine caution in patients with significant immune dysfunction.
"Persons with most forms of altered immunocompetence should not receive live vaccines (MMR, varicella, MMRV, LAIV, yellow fever, Ty21a oral typhoid, BCG, smallpox, and rotavirus)."
This general vaccine guidance supports explicit live-attenuated vaccine caution for CD27-related combined immunodeficiency.
🔀

Differential Diagnoses

3

Conditions with similar clinical presentations that must be differentiated from CD27-related lymphoproliferative and immune disorder:

CD70 deficiency
Overlapping Features CD70 deficiency phenocopies CD27 deficiency because both disrupt the same CD27/CD70 costimulatory axis. It is distinguished by TNFSF7/CD70 variants and abnormal CD70 expression rather than biallelic TNFRSF7/CD27 variants.
Show evidence (1 reference)
PMID:32603431 SUPPORT Human Clinical
"Biallelic mutations in the genes encoding CD27 or its ligand CD70 underlie inborn errors of immunity (IEIs) characterized predominantly by Epstein-Barr virus (EBV)-associated immune dysregulation"
The shared cohort establishes CD70 deficiency as the closest mechanistic and clinical differential diagnosis.
X-linked lymphoproliferative disease
Overlapping Features SH2D1A- and XIAP/BIRC4-related X-linked lymphoproliferative disorders can also present with severe EBV disease, HLH, and lymphoma, especially in male patients, but follow X-linked inheritance and have different causal genes.
Show evidence (1 reference)
PMID:32603431 PARTIAL Human Clinical
"inborn errors of immunity (IEIs) characterized predominantly by Epstein-Barr virus (EBV)-associated immune dysregulation, such as chronic viremia, severe infectious mononucleosis, hemophagocytic lymphohistiocytosis (HLH), lymphoproliferation, and malignancy."
The overlapping EBV-HLH-lymphoma pattern supports considering other EBV-susceptibility inborn errors of immunity in the differential.
ITK deficiency and MAGT1/XMEN disease
Overlapping Features ITK deficiency and MAGT1/XMEN disease are additional EBV-susceptibility inborn errors of immunity that can overlap clinically with CD27 deficiency; gene-panel or exome testing distinguishes them from TNFRSF7/CD27 disease.
Show evidence (1 reference)
PMID:32603431 PARTIAL Human Clinical
"A comprehensive understanding of the natural history, immune characteristics, and transplant outcomes has remained elusive."
The article frames CD27/CD70 deficiency within EBV-associated inborn errors of immunity, supporting broader gene-based differential testing.
{ }

Source YAML

click to show
name: CD27-related lymphoproliferative and immune disorder
creation_date: "2026-04-16T00:00:00Z"
updated_date: "2026-04-20T00:00:00Z"
category: Mendelian
synonyms:
- CD27 deficiency
- TNFRSF7 deficiency
- lymphoproliferative syndrome 2
- LPFS2
- CD27 lymphoproliferative syndrome
- combined immunodeficiency due to CD27 deficiency
disease_term:
  preferred_term: CD27-related lymphoproliferative and immune disorder
  term:
    id: MONDO:0014054
    label: lymphoproliferative syndrome 2
parents:
- Primary Immunodeficiency
- Combined immunodeficiency
- Lymphoproliferative Disorder
description: >-
  CD27-related lymphoproliferative and immune disorder is an autosomal recessive
  inborn error of immunity caused by biallelic loss-of-function variants in
  TNFRSF7/CD27. The disease is characterized by defective CD27-CD70
  costimulation, impaired control of Epstein-Barr virus, hypogammaglobulinemia,
  and a variable spectrum of EBV-driven immune dysregulation ranging from
  persistent viremia to hemophagocytic lymphohistiocytosis, lymphoproliferative
  disease, and lymphoma. Most reported patients are EBV-positive at diagnosis,
  and lymphoproliferation, lymphoma, and autoinflammatory features dominate the
  clinical course.
inheritance:
- name: Autosomal recessive
  description: >-
    CD27-related lymphoproliferative and immune disorder is caused by biallelic
    TNFRSF7/CD27 variants, most often homozygous loss-of-function alleles but
    also compound heterozygous variant combinations.
  inheritance_term:
    preferred_term: Autosomal recessive inheritance
    term:
      id: HP:0000007
      label: Autosomal recessive inheritance
  evidence:
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      We report the simultaneous confirmation of human CD27 deficiency in 3
      independent families (8 patients) due to a homozygous mutation
      (p. Cys53Tyr) revealed by whole exome sequencing, leading to disruption
      of an evolutionarily conserved cystein knot motif of the transmembrane
      receptor.
    explanation: >-
      Multiple unrelated families with homozygous CD27 variants support
      autosomal recessive inheritance.
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      4 novel mutations were identified: homozygous missense c.G287A/p.C96Y
    explanation: >-
      The expanded mutational spectrum shows that disease results from biallelic
      CD27 loss-of-function genotypes.
prevalence: []
pathophysiology:
- name: Loss of CD27-CD70 costimulation
  description: >-
    Biallelic CD27/TNFRSF7 variants reduce or abolish cell-surface CD27 and
    disrupt CD27-CD70 signaling. This removes a key TNF-receptor-family
    costimulatory input required for effective adaptive antiviral responses.
  genes:
  - preferred_term: CD27
    term:
      id: hgnc:11922
      label: CD27
  cell_types:
  - preferred_term: CD8-positive alpha-beta T cell
    term:
      id: CL:0000625
      label: CD8-positive, alpha-beta T cell
  biological_processes:
  - preferred_term: T cell costimulation
    term:
      id: GO:0031295
      label: T cell costimulation
    modifier: DECREASED
  evidence:
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Expression of cell-surface and soluble CD27 was significantly reduced in
      patients and heterozygous family members.
    explanation: >-
      Human patient immunophenotyping shows that TNFRSF7 variants reduce CD27
      expression, establishing the primary receptor-level defect.
  - reference: PMID:33827115
    reference_title: "CD27 is required for protective lytic EBV antigen-specific CD8+ T-cell expansion."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      This suggests that CD27 is not required for all CD8+ T-cell expansions
      and cytotoxicity but is required for a subset of CD8+ T-cell responses
      that protect us from EBV pathology.
    explanation: >-
      Humanized-mouse experiments directly support CD27 as a protective
      costimulatory signal for EBV-specific CD8 T-cell immunity.
  downstream:
  - target: Impaired EBV-specific cytotoxic T-cell immunity
    description: Loss of CD27 costimulation weakens the antiviral CD8 T-cell response to EBV.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:22801960
      reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        CD27, a tumor necrosis factor receptor family member, interacts with
        CD70 and influences T-, B- and NK-cell functions. Disturbance of this
        axis impairs immunity and memory generation against viruses including
        Epstein Barr virus (EBV), influenza, and others.
      explanation: >-
        Establishes that disrupted CD27-CD70 signaling impairs T-cell immunity
        against EBV, supporting the causal link from lost costimulation to
        impaired EBV-specific CD8 T-cell responses.
  - target: Reduced innate cytotoxic lymphocyte function
    description: Loss of CD27 signaling also weakens NK and iNKT-cell mediated antiviral surveillance.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:22801960
      reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        In severely affected patients, numbers of iNKT cells and NK-cell
        function were reduced.
      explanation: >-
        Demonstrates that CD27 loss leads to reduced iNKT cell numbers and
        impaired NK function in severely affected patients, supporting the
        causal link from disrupted CD27-CD70 signaling to innate cytotoxic
        lymphocyte dysfunction.
  - target: Impaired T cell-dependent humoral immunity
    description: CD27 loss also disrupts helper-dependent B-cell maturation and antibody generation.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:22197273
      reference_title: "CD27 deficiency is associated with combined immunodeficiency and persistent symptomatic EBV viremia."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Immunologically, lack of CD27 expression was associated with impaired T
        cell-dependent B-cell responses and T-cell dysfunction.
      explanation: >-
        The original CD27-deficient sibling pair directly links loss of CD27
        expression to impaired T cell-dependent B-cell responses, supporting
        the causal downstream edge.
- name: Reduced innate cytotoxic lymphocyte function
  description: >-
    In severely affected CD27-deficient patients, innate cytotoxic lymphocyte
    compartments are also compromised, with reduced NK-cell function and fewer
    invariant NKT cells further weakening antiviral immune surveillance.
  cell_types:
  - preferred_term: natural killer cell
    term:
      id: CL:0000623
      label: natural killer cell
  biological_processes:
  - preferred_term: natural killer cell mediated cytotoxicity
    term:
      id: GO:0042267
      label: natural killer cell mediated cytotoxicity
    modifier: DECREASED
  evidence:
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      In severely affected patients, numbers of iNKT cells and NK-cell
      function were reduced.
    explanation: >-
      Human CD27 deficiency can impair innate cytotoxic lymphocyte function in
      addition to adaptive antiviral immunity, broadening the mechanistic basis
      of EBV susceptibility.
  downstream:
  - target: Persistent symptomatic EBV viremia
    description: Reduced innate cytotoxic control contributes to incomplete containment of EBV infection.
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:22197273
      reference_title: "CD27 deficiency is associated with combined immunodeficiency and persistent symptomatic EBV viremia."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Both patients had persistent symptomatic EBV viremia.
      explanation: >-
        The original CD27-deficient siblings exhibited persistent symptomatic
        EBV viremia, consistent with the downstream link from reduced innate
        cytotoxic control to sustained viral replication.
  - target: EBV-driven lymphoproliferation and hyperinflammation
    description: Weakened NK and iNKT-cell surveillance further permits EBV-driven immune pathology.
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:22801960
      reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        our findings suggest that lack of functional CD27 predisposes towards a
        combined immunodeficiency associated with potentially fatal EBV-driven
        hemo-phagocytosis, lymphoproliferation, and lymphoma development.
      explanation: >-
        Directly links functional CD27 loss, which includes reduced innate
        cytotoxic lymphocyte function, to EBV-driven hyperinflammatory and
        lymphoproliferative pathology.
- name: Impaired EBV-specific cytotoxic T-cell immunity
  description: >-
    CD27 deficiency compromises expansion and effector differentiation of
    protective EBV-specific CD8-positive T cells, especially lytic antigen
    responses, allowing persistent EBV infection and defective clearance of
    EBV-transformed B cells.
  cell_types:
  - preferred_term: CD8-positive alpha-beta T cell
    term:
      id: CL:0000625
      label: CD8-positive, alpha-beta T cell
  biological_processes:
  - preferred_term: T cell proliferation
    term:
      id: GO:0042098
      label: T cell proliferation
    modifier: DECREASED
  - preferred_term: T cell activation
    term:
      id: GO:0042110
      label: T cell activation
    modifier: DECREASED
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Detailed immunological characterization revealed aberrant generation of
      memory B and T cells, including a paucity of EBV-specific T cells, and
      impaired effector function of CD8+ T cells, thereby providing mechanistic
      insight into cellular defects underpinning the clinical features of
      disrupted CD27/CD70 signaling.
    explanation: >-
      The multinational cohort directly links CD27 deficiency to deficient
      EBV-specific T-cell generation and impaired CD8 effector function.
  - reference: PMID:33827115
    reference_title: "CD27 is required for protective lytic EBV antigen-specific CD8+ T-cell expansion."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      While overall CD8+ T-cell expansion and composition are unaltered after
      antibody blocking of CD27, only some EBV-specific CD8+ T-cell responses,
      exemplified by early lytic EBV antigen BMLF1-specific CD8+ T cells, are
      inhibited in their proliferation and killing of EBV-transformed B cells.
    explanation: >-
      This functional model shows that CD27 signaling is specifically required
      for the EBV-directed CD8 response that restrains transformed B cells.
  downstream:
  - target: Persistent symptomatic EBV viremia
    description: Failure of EBV-specific cytotoxic immunity permits sustained viral replication.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:33827115
      reference_title: "CD27 is required for protective lytic EBV antigen-specific CD8+ T-cell expansion."
      supports: SUPPORT
      evidence_source: MODEL_ORGANISM
      snippet: >-
        While overall CD8+ T-cell expansion and composition are unaltered after
        antibody blocking of CD27, only some EBV-specific CD8+ T-cell responses,
        exemplified by early lytic EBV antigen BMLF1-specific CD8+ T cells, are
        inhibited in their proliferation and killing of EBV-transformed B cells.
      explanation: >-
        Functional evidence that blocking CD27 signaling impairs EBV-specific
        CD8 T-cell proliferation and killing of EBV-transformed B cells,
        supporting the downstream link to failure of viral control.
  - target: EBV-driven lymphoproliferation and hyperinflammation
    description: Persistent viral burden promotes uncontrolled EBV-associated immune pathology.
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:22801960
      reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Phenotypes varied from asymptomatic memory B-cell deficiency (n=3) to
        EBV-associated hemophagocytosis and lymphoproliferative disorder
        (LPD; n=3) and malignant lymphoma (n=2; +1 after LPD).
      explanation: >-
        Cohort data show that defective EBV-specific cytotoxicity in CD27
        deficiency progresses to EBV-associated hemophagocytosis,
        lymphoproliferation, and lymphoma.
- name: Impaired T cell-dependent humoral immunity
  description: >-
    CD27 deficiency impairs T cell-dependent B-cell responses, memory B-cell
    generation, and antibody production. This produces hypogammaglobulinemia
    and contributes to recurrent infection susceptibility.
  cell_types:
  - preferred_term: B cell
    term:
      id: CL:0000236
      label: B cell
  - preferred_term: memory B cell
    term:
      id: CL:0000787
      label: memory B cell
  biological_processes:
  - preferred_term: B cell differentiation
    term:
      id: GO:0030183
      label: B cell differentiation
    modifier: DECREASED
  - preferred_term: isotype switching
    term:
      id: GO:0045190
      label: isotype switching
    modifier: DECREASED
  evidence:
  - reference: PMID:22197273
    reference_title: "CD27 deficiency is associated with combined immunodeficiency and persistent symptomatic EBV viremia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Immunologically, lack of CD27 expression was associated with impaired T
      cell-dependent B-cell responses and T-cell dysfunction.
    explanation: >-
      The original CD27-deficient sibling pair establishes impaired helper
      dependent B-cell responses as a core immune mechanism.
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Phenotypes varied from asymptomatic memory B-cell deficiency (n=3) to
      EBV-associated hemophagocytosis and lymphoproliferative disorder
      (LPD; n=3) and malignant lymphoma (n=2; +1 after LPD).
    explanation: >-
      Some affected individuals initially present with isolated memory B-cell
      deficiency, showing that impaired post-germinal-center B-cell maturation
      is a core manifestation even before overt EBV-driven complications.
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Following EBV infection, hypogammaglobulinemia developed in at least 3 of
      the affected individuals, while specific anti-viral and
      anti-polysaccharide antibodies and EBV-specific T-cell responses were
      detectable.
    explanation: >-
      This cohort links CD27 deficiency to acquired humoral failure after EBV
      infection, including hypogammaglobulinemia and deficient immune memory.
  downstream:
  - target: Hypogammaglobulinemia
    description: Impaired B-cell maturation lowers serum immunoglobulin levels.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:22801960
      reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Following EBV infection, hypogammaglobulinemia developed in at least 3
        of the affected individuals, while specific anti-viral and
        anti-polysaccharide antibodies and EBV-specific T-cell responses were
        detectable.
      explanation: >-
        Shows that impaired T cell-dependent B-cell responses in CD27 deficiency
        result in hypogammaglobulinemia following EBV infection.
  - target: Recurrent infections
    description: Weak antibody-mediated immunity increases susceptibility to repeated infection.
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:32603431
      reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Detailed immunological characterization revealed aberrant generation of
        memory B and T cells, including a paucity of EBV-specific T cells, and
        impaired effector function of CD8+ T cells, thereby providing
        mechanistic insight into cellular defects underpinning the clinical
        features of disrupted CD27/CD70 signaling.
      explanation: >-
        Aberrant memory B-cell generation mechanistically underpins the recurrent
        infection susceptibility observed in CD27 deficiency.
- name: EBV-driven lymphoproliferation and hyperinflammation
  description: >-
    Loss of CD27-mediated immune surveillance leaves EBV insufficiently
    controlled, predisposing to lymphoproliferative disease, HLH-like
    hyperinflammation, and malignant lymphoma.
  cell_types:
  - preferred_term: B cell
    term:
      id: CL:0000236
      label: B cell
  biological_processes:
  - preferred_term: lymphocyte proliferation
    term:
      id: GO:0046651
      label: lymphocyte proliferation
    modifier: INCREASED
  - preferred_term: inflammatory response
    term:
      id: GO:0006954
      label: inflammatory response
    modifier: INCREASED
  evidence:
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Since homozygosity mapping and exome sequencing did not reveal additional
      modifying factors, our findings suggest that lack of functional CD27
      predisposes towards a combined immunodeficiency associated with
      potentially fatal EBV-driven hemo-phagocytosis, lymphoproliferation, and
      lymphoma development.
    explanation: >-
      The early CD27-deficiency cohort directly ties the upstream signaling
      defect to EBV-driven lymphoproliferation, hyperinflammation, and lymphoma.
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Lymphoproliferation and lymphoma were the main clinical manifestations
      (70% and 43%, respectively), and 9 of the CD27-deficient patients
      developed HLH.
    explanation: >-
      The largest CD27/CD70 cohort quantifies the major EBV-driven clinical
      outcomes and confirms HLH as a recurrent complication in CD27 deficiency.
  downstream:
  - target: Lymphoproliferative disorder
    description: Uncontrolled EBV-driven B-cell expansion manifests clinically as lymphoproliferative disorder.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:32603431
      reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Lymphoproliferation and lymphoma were the main clinical manifestations
        (70% and 43%, respectively), and 9 of the CD27-deficient patients
        developed HLH.
      explanation: >-
        The largest CD27/CD70 cohort quantifies lymphoproliferation as the
        dominant clinical manifestation of EBV-driven immune pathology.
  - target: Hemophagocytosis
    description: Hyperinflammatory immune activation can culminate in HLH-like hemophagocytosis.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:32603431
      reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        9 of the CD27-deficient patients developed HLH.
      explanation: >-
        The multinational cohort documents HLH as a recurrent outcome in
        CD27-deficient patients, supporting the downstream progression from
        EBV-driven hyperinflammation to hemophagocytic syndrome.
  - target: Lymphoma
    description: Chronic EBV-driven lymphoid proliferation increases risk of malignant lymphoma.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:22801960
      reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        our findings suggest that lack of functional CD27 predisposes towards a
        combined immunodeficiency associated with potentially fatal EBV-driven
        hemo-phagocytosis, lymphoproliferation, and lymphoma development.
      explanation: >-
        Directly supports progression from EBV-driven lymphoproliferation to
        malignant lymphoma in CD27 deficiency.
phenotypes:
- name: Combined immunodeficiency
  category: Immunologic
  diagnostic: true
  description: >-
    CD27 deficiency presents as a combined immunodeficiency with both T-cell and
    B-cell dysfunction.
  phenotype_term:
    preferred_term: Combined immunodeficiency
    term:
      id: HP:0005387
      label: Combined immunodeficiency
  evidence:
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Since homozygosity mapping and exome sequencing did not reveal additional
      modifying factors, our findings suggest that lack of functional CD27
      predisposes towards a combined immunodeficiency associated with
      potentially fatal EBV-driven hemo-phagocytosis, lymphoproliferation, and
      lymphoma development.
    explanation: >-
      The defining syndrome is explicitly described as a combined
      immunodeficiency caused by lack of functional CD27.
- name: Persistent symptomatic EBV viremia
  category: Infectious
  diagnostic: true
  description: >-
    Persistent or chronic active Epstein-Barr virus infection is one of the
    most characteristic manifestations of CD27 deficiency.
  phenotype_term:
    preferred_term: persistent symptomatic Epstein-Barr virus viremia
    term:
      id: HP:0032204
      label: Chronic active Epstein-Barr virus infection
  evidence:
  - reference: PMID:22197273
    reference_title: "CD27 deficiency is associated with combined immunodeficiency and persistent symptomatic EBV viremia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Both patients had persistent symptomatic EBV viremia.
    explanation: >-
      The original affected siblings establish persistent symptomatic EBV
      viremia as a hallmark disease feature.
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The majority of patients (90%) were EBV+ at diagnosis
    explanation: >-
      The multinational series shows that EBV infection is present in nearly all
      diagnosed patients even when the presentation is not classic mononucleosis.
- name: Hypogammaglobulinemia
  category: Immunologic
  description: >-
    Reduced circulating immunoglobulin levels emerge in many affected
    individuals, often after EBV infection.
  phenotype_term:
    preferred_term: Hypogammaglobulinemia
    term:
      id: HP:0004313
      label: Decreased circulating immunoglobulin concentration
  evidence:
  - reference: PMID:22197273
    reference_title: "CD27 deficiency is associated with combined immunodeficiency and persistent symptomatic EBV viremia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The index patient was hypogammaglobulinemic, and immunoglobulin
      replacement therapy was initiated.
    explanation: >-
      The original sibling pair directly documents clinically relevant
      hypogammaglobulinemia.
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Following EBV infection, hypogammaglobulinemia developed in at least 3 of
      the affected individuals, while specific anti-viral and
      anti-polysaccharide antibodies and EBV-specific T-cell responses were
      detectable.
    explanation: >-
      Additional CD27-deficient patients developed hypogammaglobulinemia after
      EBV infection, showing this is a recurring humoral phenotype.
- name: Uveitis
  category: Ophthalmologic
  description: >-
    Uveitis is a recurrent inflammatory manifestation in CD27 deficiency and is
    part of the broader EBV-associated immune dysregulation phenotype.
  phenotype_term:
    preferred_term: Uveitis
    term:
      id: HP:0000554
      label: Uveitis
  evidence:
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      EBV-associated lymphoproliferative disease/hemophagocytic
      lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections
      were the predominant clinical features.
    explanation: >-
      The expanded clinical cohort explicitly lists uveitis among the
      predominant features of CD27 deficiency.
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Twenty-one patients (43%) developed autoinflammatory features including
      uveitis, arthritis, and periodic fever.
    explanation: >-
      The multinational cohort confirms that uveitis is a common
      autoinflammatory manifestation in disrupted CD27/CD70 signaling.
- name: Arthritis
  category: Musculoskeletal
  description: >-
    Arthritis occurs as part of the autoinflammatory phenotype reported in a
    substantial subset of patients with CD27 deficiency.
  phenotype_term:
    preferred_term: Arthritis
    term:
      id: HP:0001369
      label: Arthritis
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Twenty-one patients (43%) developed autoinflammatory features including
      uveitis, arthritis, and periodic fever.
    explanation: >-
      The multinational cohort directly documents arthritis as part of the
      autoinflammatory spectrum of CD27 deficiency.
- name: Recurrent fever
  category: Constitutional
  description: >-
    Periodic or recurrent fever is part of the autoinflammatory phenotype seen
    in CD27 deficiency.
  phenotype_term:
    preferred_term: Recurrent fever
    term:
      id: HP:0001954
      label: Recurrent fever
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Twenty-one patients (43%) developed autoinflammatory features including
      uveitis, arthritis, and periodic fever.
    explanation: >-
      This cohort shows that recurrent fever is a common autoinflammatory
      manifestation in disrupted CD27/CD70 signaling.
- name: Lymphoproliferative disorder
  category: Hematologic
  diagnostic: true
  description: >-
    EBV-associated nonmalignant lymphoproliferation is a core manifestation of
    CD27 deficiency.
  phenotype_term:
    preferred_term: lymphoproliferative disorder
    term:
      id: HP:0005523
      label: Lymphoproliferative disorder
  evidence:
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Phenotypes varied from asymptomatic memory B-cell deficiency (n=3) to
      EBV-associated hemophagocytosis and lymphoproliferative disorder
      (LPD; n=3) and malignant lymphoma (n=2; +1 after LPD).
    explanation: >-
      This case series explicitly documents EBV-associated lymphoproliferative
      disorder in multiple CD27-deficient patients.
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Lymphoproliferation and lymphoma were the main clinical manifestations
      (70% and 43%, respectively), and 9 of the CD27-deficient patients
      developed HLH.
    explanation: >-
      The larger cohort confirms lymphoproliferation as the most frequent major
      disease manifestation.
- name: Hemophagocytosis
  category: Hematologic
  description: >-
    Some patients develop HLH-like hemophagocytic hyperinflammation during
    uncontrolled EBV disease.
  phenotype_term:
    preferred_term: Hemophagocytosis
    term:
      id: HP:0012156
      label: Hemophagocytosis
  evidence:
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Phenotypes varied from asymptomatic memory B-cell deficiency (n=3) to
      EBV-associated hemophagocytosis and lymphoproliferative disorder
      (LPD; n=3) and malignant lymphoma (n=2; +1 after LPD).
    explanation: >-
      Hemophagocytosis is explicitly reported as an EBV-associated complication
      in CD27 deficiency.
- name: Lymphoma
  category: Neoplastic
  description: >-
    CD27 deficiency markedly predisposes to EBV-driven malignant lymphoma,
    including Hodgkin lymphoma.
  phenotype_term:
    preferred_term: Lymphoma
    term:
      id: HP:0002665
      label: Lymphoma
  evidence:
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      EBV-associated lymphoproliferative disease/hemophagocytic
      lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections
      were the predominant clinical features.
    explanation: >-
      The expanded CD27-deficiency cohort identifies Hodgkin lymphoma as a
      predominant disease manifestation.
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Our data highlight the marked predisposition to lymphoma of both CD27-
      and CD70-deficient patients.
    explanation: >-
      The largest natural-history series emphasizes lymphoma as a defining risk
      of disrupted CD27/CD70 signaling.
- name: Recurrent infections
  category: Immunologic
  description: >-
    Repeated infections occur on the background of combined immunodeficiency and
    defective humoral immunity.
  phenotype_term:
    preferred_term: Recurrent infections
    term:
      id: HP:0002719
      label: Recurrent infections
  evidence:
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      EBV-associated lymphoproliferative disease/hemophagocytic
      lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections
      were the predominant clinical features.
    explanation: >-
      Recurrent infections are explicitly listed among the predominant clinical
      features in the expanded CD27-deficiency cohort.
biochemical: []
genetic:
- name: CD27
  association: CAUSATIVE
  gene_term:
    preferred_term: CD27
    term:
      id: hgnc:11922
      label: CD27
  notes: >-
    Disease is caused by biallelic TNFRSF7/CD27 loss-of-function variants that
    reduce or abolish receptor expression. TNFRSF7 is a historical alias for
    CD27. Flow-cytometric immunophenotyping for absent or markedly reduced CD27
    expression on lymphoid cells is a practical screening test before
    confirmatory sequencing in severe EBV-associated disease.
  evidence:
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      4 novel mutations were identified: homozygous missense c.G287A/p.C96Y
    explanation: >-
      This study expands the disease-causing TNFRSF7/CD27 variant spectrum and
      confirms CD27 as the causal gene.
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      We report the simultaneous confirmation of human CD27 deficiency in 3
      independent families (8 patients) due to a homozygous mutation
      (p. Cys53Tyr) revealed by whole exome sequencing, leading to disruption
      of an evolutionarily conserved cystein knot motif of the transmembrane
      receptor.
    explanation: >-
      Independent families with the same homozygous missense variant confirm
      CD27 deficiency as a monogenic disorder.
diagnosis:
- name: CD27 expression by flow cytometry
  description: >-
    Flow-cytometric immunophenotyping for absent or markedly reduced CD27 on
    lymphoid cells is a rapid screening test in patients with severe or
    persistent EBV-associated disease.
  diagnosis_term:
    preferred_term: flow cytometry procedure
    term:
      id: MAXO:0035055
      label: flow cytometry procedure
  results: >-
    Absent or strongly reduced cell-surface CD27 expression supports CD27
    deficiency and should prompt confirmatory TNFRSF7/CD27 sequencing.
  evidence:
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Flow cytometric immunophenotyping offers a reliable initial test for CD27
      deficiency.
    explanation: >-
      This directly supports CD27 flow cytometry as an initial diagnostic test.
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Flow cytometric immunophenotyping including expression analysis of CD27 on
      lymphoid cells was followed by capillary sequencing of CD27 in index
      patients, their parents, and non-affected siblings.
    explanation: >-
      The original multi-family series used CD27 expression analysis on lymphoid
      cells before family sequencing, supporting flow cytometry as part of the
      diagnostic workflow.
- name: TNFRSF7/CD27 molecular genetic testing
  description: >-
    Molecular testing confirms the diagnosis by identifying biallelic
    pathogenic TNFRSF7/CD27 variants.
  diagnosis_term:
    preferred_term: molecular genetic testing
    term:
      id: MAXO:0000533
      label: molecular genetic testing
    qualifiers:
    - predicate:
        preferred_term: has participant
        term:
          id: RO:0000057
          label: has participant
      value:
        preferred_term: CD27
        term:
          id: hgnc:11922
          label: CD27
  results: Biallelic pathogenic TNFRSF7/CD27 variants confirm the diagnosis.
  evidence:
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      We report the simultaneous confirmation of human CD27 deficiency in 3
      independent families (8 patients) due to a homozygous mutation
      (p. Cys53Tyr) revealed by whole exome sequencing, leading to disruption
      of an evolutionarily conserved cystein knot motif of the transmembrane
      receptor.
    explanation: >-
      Exome sequencing identified the causal homozygous CD27 variant in
      multiple independent families.
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      4 novel mutations were identified: homozygous missense c.G287A/p.C96Y
    explanation: >-
      The expanded cohort confirms additional disease-causing TNFRSF7/CD27
      genotypes.
- name: EBV viral-load assessment
  description: >-
    EBV DNA testing and EBV serology help establish the EBV-driven disease
    context and provide a baseline for longitudinal monitoring.
  results: >-
    Detectable or persistent EBV viremia supports the characteristic
    EBV-associated immune dysregulation phenotype but is not by itself
    diagnostic.
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The majority of patients (90%) were EBV+ at diagnosis, but only ∼30%
      presented with infectious mononucleosis.
    explanation: >-
      EBV positivity is common at diagnosis even without classic infectious
      mononucleosis, supporting EBV testing in the diagnostic workup.
- name: Humoral immune evaluation
  description: >-
    Quantitative IgG, IgA, and IgM levels, vaccine antibody responses, and
    memory B-cell phenotyping help identify the antibody-deficiency component.
  results: >-
    Hypogammaglobulinemia, impaired specific antibody responses, or reduced
    memory B cells support a combined immunodeficiency phenotype.
  evidence:
  - reference: PMID:22197273
    reference_title: "CD27 deficiency is associated with combined immunodeficiency and persistent symptomatic EBV viremia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The index patient was hypogammaglobulinemic, and immunoglobulin
      replacement therapy was initiated.
    explanation: >-
      The original sibling pair documents clinically relevant antibody
      deficiency.
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Following EBV infection, hypogammaglobulinemia developed in at least 3 of
      the affected individuals, while specific anti-viral and
      anti-polysaccharide antibodies and EBV-specific T-cell responses were
      detectable.
    explanation: >-
      Recurrent hypogammaglobulinemia after EBV infection supports quantitative
      immunoglobulin and antibody-response evaluation.
- name: Lymphocyte subset and functional immunophenotyping
  description: >-
    Lymphocyte subset analysis should assess memory B cells, T-cell memory
    compartments, EBV-specific T-cell frequencies, and CD8 T-cell effector
    function where available.
  diagnosis_term:
    preferred_term: flow cytometry procedure
    term:
      id: MAXO:0035055
      label: flow cytometry procedure
  results: >-
    Paucity of memory B/T cells, reduced EBV-specific T cells, or impaired CD8
    effector function supports disrupted CD27/CD70 signaling.
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Detailed immunological characterization revealed aberrant generation of
      memory B and T cells, including a paucity of EBV-specific T cells, and
      impaired effector function of CD8+ T cells
    explanation: >-
      The largest cohort identifies the key cellular immune abnormalities to
      evaluate when CD27 deficiency is suspected.
- name: HLH and lymphoma complication workup
  description: >-
    Patients with fever, cytopenias, organomegaly, lymphadenopathy, or systemic
    inflammation require evaluation for HLH and lymphoma, including ferritin,
    triglycerides, fibrinogen, soluble IL-2 receptor when available, tissue
    biopsy of suspicious nodes or masses, and staging imaging guided by
    hematology/oncology.
  diagnosis_term:
    preferred_term: clinical assessment
    term:
      id: MAXO:0000487
      label: clinical assessment
  results: >-
    HLH features, EBV-associated lymphoproliferative disease, or malignant
    lymphoma identify severe complications that change urgency and management.
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Lymphoproliferation and lymphoma were the main clinical manifestations
      (70% and 43%, respectively), and 9 of the CD27-deficient patients
      developed HLH.
    explanation: >-
      The high frequency of lymphoproliferation, lymphoma, and HLH supports
      directed complication workup at presentation and during flares.
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      EBV-associated lymphoproliferative disease/hemophagocytic
      lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections
      were the predominant clinical features.
    explanation: >-
      This expanded cohort confirms that lymphoproliferative disease, HLH, and
      Hodgkin lymphoma are predominant complications requiring active assessment.
differential_diagnoses:
- name: CD70 deficiency
  description: >-
    CD70 deficiency phenocopies CD27 deficiency because both disrupt the same
    CD27/CD70 costimulatory axis. It is distinguished by TNFSF7/CD70 variants
    and abnormal CD70 expression rather than biallelic TNFRSF7/CD27 variants.
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Biallelic mutations in the genes encoding CD27 or its ligand CD70
      underlie inborn errors of immunity (IEIs) characterized predominantly by
      Epstein-Barr virus (EBV)-associated immune dysregulation
    explanation: >-
      The shared cohort establishes CD70 deficiency as the closest mechanistic
      and clinical differential diagnosis.
- name: X-linked lymphoproliferative disease
  description: >-
    SH2D1A- and XIAP/BIRC4-related X-linked lymphoproliferative disorders can
    also present with severe EBV disease, HLH, and lymphoma, especially in male
    patients, but follow X-linked inheritance and have different causal genes.
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      inborn errors of immunity (IEIs) characterized predominantly by
      Epstein-Barr virus (EBV)-associated immune dysregulation, such as chronic
      viremia, severe infectious mononucleosis, hemophagocytic
      lymphohistiocytosis (HLH), lymphoproliferation, and malignancy.
    explanation: >-
      The overlapping EBV-HLH-lymphoma pattern supports considering other
      EBV-susceptibility inborn errors of immunity in the differential.
- name: ITK deficiency and MAGT1/XMEN disease
  description: >-
    ITK deficiency and MAGT1/XMEN disease are additional EBV-susceptibility
    inborn errors of immunity that can overlap clinically with CD27 deficiency;
    gene-panel or exome testing distinguishes them from TNFRSF7/CD27 disease.
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      A comprehensive understanding of the natural history, immune
      characteristics, and transplant outcomes has remained elusive.
    explanation: >-
      The article frames CD27/CD70 deficiency within EBV-associated inborn
      errors of immunity, supporting broader gene-based differential testing.
treatments:
- name: Immunoglobulin replacement therapy
  description: >-
    Immunoglobulin replacement is supportive treatment for the antibody
    deficiency component of CD27 deficiency.
  treatment_term:
    preferred_term: immunoglobulin replacement therapy
    term:
      id: MAXO:0001480
      label: immunoglobulin infusion therapy
  target_phenotypes:
  - preferred_term: Hypogammaglobulinemia
    term:
      id: HP:0004313
      label: Decreased circulating immunoglobulin concentration
  evidence:
  - reference: PMID:22197273
    reference_title: "CD27 deficiency is associated with combined immunodeficiency and persistent symptomatic EBV viremia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The index patient was hypogammaglobulinemic, and immunoglobulin
      replacement therapy was initiated.
    explanation: >-
      This directly documents immunoglobulin replacement as supportive care for
      CD27-deficient hypogammaglobulinemia.
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Immunoglobulin substitution therapy was administered in 5 of the newly
      diagnosed cases.
    explanation: >-
      The expanded cohort confirms that immunoglobulin replacement is a common
      supportive treatment in clinical practice.
- name: Allogeneic hematopoietic stem cell transplantation
  description: >-
    Allogeneic HSCT is the main potentially curative treatment for severe
    CD27-related disease, especially when lymphoma, HLH, or refractory
    EBV-driven immune dysregulation develops.
  treatment_term:
    preferred_term: allogeneic hematopoietic stem cell transplantation
    term:
      id: MAXO:0001479
      label: allogeneic hematopoietic stem cell transplantation
  target_phenotypes:
  - preferred_term: Lymphoma
    term:
      id: HP:0002665
      label: Lymphoma
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Nineteen patients underwent allogeneic hematopoietic stem cell
      transplantation (HSCT) prior to adulthood predominantly because of
      lymphoma, with 95% survival without disease recurrence.
    explanation: >-
      The multinational series shows excellent HSCT outcomes and supports early
      use for severe lymphoma-predominant disease.
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Two of 8 patients died, 2 others underwent allogeneic hematopoietic stem
      cell transplantation successfully, and one received anti-CD20
      (rituximab) therapy repeatedly.
    explanation: >-
      Early case-series experience already showed successful allogeneic HSCT in
      severe CD27 deficiency.
- name: Rituximab
  description: >-
    Anti-CD20 monoclonal antibody therapy has been used as adjunctive or bridge
    treatment for severe EBV-driven CD20-positive B-cell lymphoproliferation or
    lymphoma in CD27 deficiency.
  treatment_term:
    preferred_term: rituximab therapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: rituximab
      term:
        id: NCIT:C1702
        label: Rituximab
  target_phenotypes:
  - preferred_term: lymphoproliferative disorder
    term:
      id: HP:0005523
      label: Lymphoproliferative disorder
  - preferred_term: Lymphoma
    term:
      id: HP:0002665
      label: Lymphoma
  evidence:
  - reference: PMID:22801960
    reference_title: "Combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder in patients lacking functional CD27."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Two of 8 patients died, 2 others underwent allogeneic hematopoietic stem
      cell transplantation successfully, and one received anti-CD20
      (rituximab) therapy repeatedly.
    explanation: >-
      The early CD27-deficiency case series documents repeated rituximab use as
      adjunct treatment for severe EBV-driven disease.
- name: EBV and malignancy surveillance
  description: >-
    Longitudinal follow-up should monitor EBV burden, lymphadenopathy,
    cytopenias, systemic inflammatory features, and symptoms concerning for
    lymphoproliferative disease or lymphoma.
  treatment_term:
    preferred_term: supportive care
    term:
      id: MAXO:0000950
      label: supportive care
  target_phenotypes:
  - preferred_term: persistent symptomatic Epstein-Barr virus viremia
    term:
      id: HP:0032204
      label: Chronic active Epstein-Barr virus infection
  - preferred_term: Lymphoma
    term:
      id: HP:0002665
      label: Lymphoma
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The majority of patients (90%) were EBV+ at diagnosis, but only ∼30%
      presented with infectious mononucleosis. Lymphoproliferation and lymphoma
      were the main clinical manifestations (70% and 43%, respectively)
    explanation: >-
      EBV positivity and frequent lymphoproliferation/lymphoma support ongoing
      viral and malignancy surveillance.
- name: HLH- and lymphoma-directed acute management
  description: >-
    Suspected HLH, EBV-driven lymphoproliferative disease, or lymphoma requires
    urgent hematology/oncology-directed treatment using disease-standard
    protocols, with infection support and consideration of HSCT once acute
    disease is controlled.
  treatment_term:
    preferred_term: pharmacotherapy
    term:
      id: MAXO:0000058
      label: pharmacotherapy
  target_phenotypes:
  - preferred_term: Hemophagocytosis
    term:
      id: HP:0012156
      label: Hemophagocytosis
  - preferred_term: Lymphoma
    term:
      id: HP:0002665
      label: Lymphoma
  evidence:
  - reference: PMID:32603431
    reference_title: "Extended clinical and immunological phenotype and transplant outcome in CD27 and CD70 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Lymphoproliferation and lymphoma were the main clinical manifestations
      (70% and 43%, respectively), and 9 of the CD27-deficient patients
      developed HLH.
    explanation: >-
      Frequent severe lymphoproliferative, malignant, and HLH complications
      support explicit acute specialty-directed management.
  - reference: PMID:25843314
    reference_title: "Novel mutations in TNFRSF7/CD27: Clinical, immunologic, and genetic characterization of human CD27 deficiency."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      EBV-associated lymphoproliferative disease/hemophagocytic
      lymphohistiocytosis, Hodgkin lymphoma, uveitis, and recurrent infections
      were the predominant clinical features.
    explanation: >-
      The clinical spectrum includes the acute complications that require
      disease-specific treatment rather than only immunoglobulin replacement.
- name: Vaccine planning for combined immunodeficiency
  description: >-
    Vaccination decisions should be individualized with immunology and
    infectious-disease input. Non-live vaccines may be indicated, whereas
    live-attenuated vaccines should be deferred or avoided when clinically
    significant cellular or combined immunodeficiency is present.
  treatment_term:
    preferred_term: vaccination
    term:
      id: MAXO:0001017
      label: vaccination
  target_phenotypes:
  - preferred_term: Combined immunodeficiency
    term:
      id: HP:0005387
      label: Combined immunodeficiency
  evidence:
  - reference: url:https://www.cdc.gov/vaccines/hcp/imz-best-practices/altered-immunocompetence.html
    reference_title: "Altered Immunocompetence | Vaccines & Immunizations | CDC"
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      Administration of live vaccines might need to be deferred until immune
      function has improved.
    explanation: >-
      CDC altered-immunocompetence guidance supports live-vaccine caution in
      patients with significant immune dysfunction.
  - reference: url:https://www.cdc.gov/vaccines/hcp/imz-best-practices/altered-immunocompetence.html
    reference_title: "Altered Immunocompetence | Vaccines & Immunizations | CDC"
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      Persons with most forms of altered immunocompetence should not receive
      live vaccines (MMR, varicella, MMRV, LAIV, yellow fever, Ty21a oral
      typhoid, BCG, smallpox, and rotavirus).
    explanation: >-
      This general vaccine guidance supports explicit live-attenuated vaccine
      caution for CD27-related combined immunodeficiency.
datasets: []
notes: >-
  MONDO currently labels MONDO:0014054 as "lymphoproliferative syndrome 2". This
  entry uses the more explicit preferred term "CD27-related lymphoproliferative
  and immune disorder" consistent with MONDO new term request #10132 opened on
  April 7, 2026, to better reflect the combined immunodeficiency and
  EBV-associated immune dysregulation phenotype.
📚

References & Deep Research

Deep Research

2
Asta
Asta Literature Retrieval: Pathophysiology and clinical mechanisms of CD27-related lymphoproliferative and immune disorder. Core disease mechani...
Asta Scientific Corpus Retrieval 20 citations 2026-04-19T15:03:53.923362

Asta Literature Retrieval: Pathophysiology and clinical mechanisms of CD27-related lymphoproliferative and immune disorder. Core disease mechani...

This report is retrieval-only and is generated directly from Asta results.

  • Papers retrieved: 20
  • Snippets retrieved: 20

Relevant Papers

[1] Germline STAT3 gain-of-function mutations in primary immunodeficiency: Impact on the cellular and clinical phenotype

  • Authors: Laura Faletti, S. Ehl, Maximilian Heeg
  • Year: 2021
  • Venue: Biomedical Journal
  • URL: https://www.semanticscholar.org/paper/21f376f67897eb5eb8f262a2cd0a13850bd1144a
  • DOI: 10.1016/j.bj.2021.03.003
  • PMID: 34366294
  • PMCID: 8514798
  • Citations: 32
  • Influential citations: 2
  • Summary: The current understanding of the disease is summarized and the clinical phenotype, diagnostic approach, cellular and molecular effects of STAT3 GOF mutations and therapeutic concepts for these patients are discussed.
  • Evidence snippets:
  • Snippet 1 (score: 0.483) > unraveling the molecular and cellular mechanisms underlying this disease. In this review, we summarize our current understanding of the disease and discuss the clinical phenotype, diagnostic approach, cellular and molecular effects of STAT3 GOF mutations and therapeutic concepts for these patients. > Control of immune cell activation is critical to restore immune homeostasis after resolution of infections and to prevent immunopathology including autoimmune diseases. Uncontrolled expansion of immune cells is a hallmark feature of benign lymphoproliferation manifesting as lymphadenopathy and/or splenomegaly and of immune-cell derived malignancies. The combination of lymphoproliferation and autoimmunity or immunopathology, variably associated with increased infection susceptibility, is characteristic for a group of inborn errors of immunity that can be summarized as autoimmune-lymphoproliferative primary immunodeficiencies (AL-PID). In recent years, tremendous progress has been made in understanding the genetic and molecular mechanisms underlying this spectrum of diseases. Mutations in the FAS pathway were the first genetic variants identified to cause autoimmune-lymphoproliferative syndromes (ALPS) in the 1990s [1]. However, recent advances in genetics have allowed the discovery of defects in many other pathways that can lead to ALPS-like clinical presentations. They include disorders of the RAS-pathway, the PI3 Kinase pathway, JAK/ STAT pathways, the NFkB pathway and the CTLA4 checkpoint pathway. Amongst these genes recently associated with an ALPS-like phenotype is STAT3 (Signal transducer and activator of transcription 3) [2e4]. > Janus tyrosine kinases (JAKs) and STATs are crucial proteins in signal transduction initiated by a wide range of cytokines [5] and growth factors [6]. The important functions of the JAK-STAT signaling components in the control of the immune system homeostasis have been demonstrated by genetic knockout studies [7e9]. STAT3 is essential for vertebrate development [10] and plays a critical role in regulating key physiological functions in tissues, including the innate and adaptive immune responses [11].

[2] Pediatric lymphoproliferative disorders – Emerging insights and management: A narrative review

  • Authors: E. I. Obeagu
  • Year: 2026
  • Venue: Medicine
  • URL: https://www.semanticscholar.org/paper/c863790c34ecacab3322012ad2a9012ae860a9d2
  • DOI: 10.1097/MD.0000000000047367
  • PMID: 41578561
  • PMCID: 12851739
  • Summary: Challenges persist in ensuring equitable access to advanced diagnostics and therapies, particularly in resource-limited settings, and optimizing treatment regimens to minimize long-term complications and improve quality of life remains a critical area of focus.
  • Evidence snippets:
  • Snippet 1 (score: 0.455) > Pediatric lymphoproliferative disorders (PLPDs) encompass a spectrum of conditions marked by the abnormal proliferation of lymphocytes, often linked to genetic mutations, immune dysregulation, and infectious agents like Epstein–Barr virus. These disorders present with varied clinical phenotypes, ranging from benign lymphadenopathy to severe, life-threatening malignancies. Recent advancements in molecular diagnostics and imaging have significantly enhanced the early identification and classification of PLPDs, paving the way for timely and effective interventions. Understanding the pathophysiological mechanisms underlying PLPDs has also been instrumental in guiding the development of novel therapeutic strategies. The management of PLPDs has evolved with the advent of targeted therapies, including monoclonal antibodies and small molecule inhibitors, which have demonstrated promising efficacy in mitigating disease progression. For severe or refractory cases, hematopoietic stem cell transplantation remains a curative option, especially for disorders associated with primary immunodeficiencies. Despite these advancements, challenges persist in ensuring equitable access to advanced diagnostics and therapies, particularly in resource-limited settings. Furthermore, optimizing treatment regimens to minimize long-term complications and improve quality of life remains a critical area of focus.

[3] Effects of B-Cell Lymphoma on the Immune System and Immune Recovery after Treatment: The Paradigm of Targeted Therapy

  • Authors: S. Mancuso, Marta Mattana, M. Carlisi, M. Santoro, S. Siragusa
  • Year: 2022
  • Venue: International Journal of Molecular Sciences
  • URL: https://www.semanticscholar.org/paper/7c7575b1a80f5db2990660562a0d07f2b2f7d3e7
  • DOI: 10.3390/ijms23063368
  • PMID: 35328789
  • PMCID: 8952275
  • Citations: 19
  • Summary: The aim of this review is to report relevant data on the evolution of the immune system during and after treatment with targeted therapy of B-cell lymphomas.
  • Evidence snippets:
  • Snippet 1 (score: 0.439) > B-cell lymphoma and lymphoproliferative diseases represent a heterogeneous and complex group of neoplasms that are accompanied by a broad range of immune regulatory disorder phenotypes. Clinical features of autoimmunity, hyperinflammation, immunodeficiency and infection can variously dominate, depending on the immune pathway most involved. Immunological imbalance can play a role in lymphomagenesis, also supporting the progression of the disease, while on the other hand, lymphoma acts on the immune system to weaken immunosurveillance and facilitate immunoevasion. Therefore, the modulation of immunity can have a profound effect on disease progression or resolution, which makes the immune system a critical target for new therapies. In the current therapeutic scenario enriched by chemo-free regimens, it is important to establish the effect of various drugs on the disease, as well as on the restoration of immune functions. In fact, treatment of B-cell lymphoma with passive immunotherapy that targets tumor cells or targets the tumor microenvironment, together with adoptive immunotherapy, is becoming more frequent. The aim of this review is to report relevant data on the evolution of the immune system during and after treatment with targeted therapy of B-cell lymphomas.

[4] Clinical and functional characterization of a novel TNFRSF9 variant causing immune dysregulation with predisposition to EBV-driven lymphomagenesis

  • Authors: P. Zhao, Kailan Chen, Li Yang, Chunhui Wan, Lei Zhang et al.
  • Year: 2025
  • Venue: Frontiers in Immunology
  • URL: https://www.semanticscholar.org/paper/21b103b886f3d12184b4d129751acdd4862dfb84
  • DOI: 10.3389/fimmu.2025.1605221
  • PMID: 40843003
  • PMCID: 12364884
  • Summary: The findings expand the mutation spectrum of the TNFRSF9 gene and provide new insights into the molecular mechanisms underlying this rare immunodeficiency disorder.
  • Evidence snippets:
  • Snippet 1 (score: 0.435) > EBV-specific immunity relies on robust cellular and humoral immune responses, with CD8+ cytotoxic T cells playing a critical role in controlling EBV infection. Patients with genetic variants affecting T-cell development and function are highly susceptible to chronic EBV infection (14). Growing evidence suggests that genetic defects impairing immune surveillance pathways increase susceptibility to EBV-associated lymphoproliferative disease (EBV + LPD) (4). To date, over 20 monogenic disorders, including variants in CD27, CD70, SH2D1A, ITK, MAGT1, PRKCD, PIK3CD, CORO1A, RASGRP1 and CTPS1, have linked to immune dysregulation and susceptibility to EBV-driven B cell lymphoproliferative disorders (15)(16)(17). These defects impair virusspecific T-cell responses, highlighting critical pathways required for immune control of EBV. Research on these patients has offered valuable insights into the mechanisms of immune surveillance against EBV and the pathogenesis of EBV-driven malignancies. > In this study, we report a case presenting with EBV viremia, recurrent respiratory infections, and Burkitt lymphoma. By nextgeneration sequencing, a novel homozygous missense variant (c.359G>C, p.C120S) in the TNFRSF9 gene was identified. Functional studies revealed that the p.C120S variant reduced TNFRSF9 expression at both mRNA and protein levels, impaired AKT and NF-kB signaling pathways. These findings underscore the critical role of TNFRSF9 in maintaining immune homeostasis and controlling EBV infection, and highlight the importance of molecular diagnostics in guiding targeted therapies for Inborn Errors of Immunity. > A review of the literature revealed only nine reported patients of TNFRSF9 deficiency, with significant clinical heterogeneity even among patients carrying the same variant (Table 2).

[5] Investigating the role of NPR1 in dilated cardiomyopathy and its potential as a therapeutic target for glucocorticoid therapy

  • Authors: Yaomeng Huang, Tongxin Li, Shichao Gao, Shuyu Li, Xiaoran Zhu et al.
  • Year: 2023
  • Venue: Frontiers in Pharmacology
  • URL: https://www.semanticscholar.org/paper/be229f6f2059faab4c97ec0a04bd055adab9dfe1
  • DOI: 10.3389/fphar.2023.1290253
  • PMID: 38026943
  • PMCID: 10662320
  • Citations: 3
  • Summary: Natriuretic peptide receptor 1 (NPR1) was identified as a core gene associated with DCM through bioinformatics analysis and led to substantial improvements in cardiac and renal function, accompanied by an upregulation of NPR1 expression.
  • Evidence snippets:
  • Snippet 1 (score: 0.430) > Multiple pathways and molecules are involved in this process; however, the detailed underlying mechanisms remain unclear. In recent years, with the development of high-throughput sequencing and gene chip technologies, the use of bioinformatics technology to explore the occurrence, development, and prognosis of diseases has become a hot topic for scholars worldwide (Hwang et al., 2018;Nayor et al., 2019;Rinschen et al., 2019;Sturm et al., 2019;Montaner et al., 2020). > The present study aimed to use bioinformatics technology to screen for DCM-related genes and investigate their mechanisms, with the purpose of revealing the pathogenesis of DCM and seeking treatment methods. The GSE3586 dataset, containing expression profiles related to DCM, was selected from the Gene Expression Omnibus (GEO) database. This study aimed to predict the core genes that may play crucial roles in disease progression at the molecular level through the enrichment of relevant molecular pathways associated with DCM. Furthermore, the phenotype of the core genes was validated to further support the results of the bioinformatics analysis through basic and clinical experiments. Additionally, the role of glucocorticoids in DCM treatment is discussed in this article with the purpose of providing a theoretical and experimental basis for exploring the pathogenesis of DCM and elucidating therapeutic methods. This study also provides a theoretical reference for the interpretation, early diagnosis, and treatment of DCM.

[6] Inborn Errors of Immunity With Immune Dysregulation: From Bench to Bedside

  • Authors: O. Delmonte, R. Castagnoli, Enrica Calzoni, L. Notarangelo
  • Year: 2019
  • Venue: Frontiers in Pediatrics
  • URL: https://www.semanticscholar.org/paper/3b1a3d33817709ddb2b6cb09f861f81b11721d57
  • DOI: 10.3389/fped.2019.00353
  • PMID: 31508401
  • PMCID: 6718615
  • Citations: 91
  • Influential citations: 2
  • Summary: The clinical and laboratory features of various recently described inborn errors of immunity associated with immune dysregulation and hyperinflammation in which mechanism-based therapeutic approaches have been implemented are summarized.
  • Evidence snippets:
  • Snippet 1 (score: 0.419) > With the increased availability of high-throughput DNA sequencing, the number of genes associated with inborn errors of immunity [historically named primary immune deficiency disorders (PIDs)] has exponentially increased over the last decade. The most recent PID classification from the International Union of Immunological Sciences includes more than 350 genes, and ∼50 of these have been discovered in the last 2 years (1). In addition to the identification of novel PID-associated genes, it has been recognized that distinct clinical phenotypes may be sustained by Gain of Function (GOF) or Loss of Function (LOF) mutations in the same gene. Finally, various degrees of activity of mutant proteins due to hypomorphic and hypermorphic mutations may also cause PID phenotypic variability (1,2). > The clinical features of PIDs are broad, ranging from increased susceptibility to infections to significant immune dysregulation, often leading to multiple autoimmune phenomena, including cytopenias and solid organ autoimmunity, in addition to lymphoproliferation and malignancy. The treatment of immune disorders with coexisting immune deficiency and immune dysregulation is challenging, as it requires careful balancing of immunosuppression in subjects at increased risk of infections. In most recent years, the growing ability to define PID pathophysiology at the molecular level has set the basis for the development of targeted therapeutic interventions. New drugs have been developed or repurposed to modulate intracellular pathways whose function is increased or diminished as a result of a specific genetic defect ( Table 1). Such a "precision medicine" approach often permits to selectively target a specific cell function instead of broadly affecting the entire immune system, and may even permit to avoid deleterious side effects on other tissues. In this manuscript, we summarize the laboratory and clinical features of various recently described PIDs, focusing in particular on disorders associated with immune dysregulation in which targeted therapeutic approaches have been implemented according to the recent knowledge of the molecular mechanisms underpinning these diseases and the most common clinical manifestations.

[7] Restoration of the immune function as a complementary strategy to treat Chronic Lymphocytic Leukemia effectively

  • Authors: C. Moreno, C. Muñoz, M. Terol, J. Hernández‐Rivas, Miguel Villanueva
  • Year: 2021
  • Venue: Journal of Experimental & Clinical Cancer Research : CR
  • URL: https://www.semanticscholar.org/paper/138daa4ae761d5f2195d43842b98843f2f427564
  • DOI: 10.1186/s13046-021-02115-1
  • PMID: 34654437
  • PMCID: 8517318
  • Citations: 31
  • Summary: It is proposed that a dual therapeutic approach, acting directly against malignant B-cells and restoring the immune function is clinically relevant and should be considered when developing future strategies to treat patients with CLL.
  • Evidence snippets:
  • Snippet 1 (score: 0.415) > Chronic Lymphocytic Leukemia (CLL) is the most common B-cell malignancy in the Western world [1]. CLL is a lymphoproliferative disease characterized by the accumulation of mature monoclonal B-cells with a typical immunophenotype (i.e, CD5+CD23+ and other B-cell markers) which accumulate in peripheral blood, bone marrow and lymph nodes. A hallmark of the pathophysiology of CLL is the dysfunction of the immune system which is mostly translated in a state of humoral and cellular immunodeficiency and higher prevalence of autoimmune disorders [2,3]. > In CLL, tumor cells influence the immune system to escape immunosurveillance and create an immunosuppressive microenvironment. In general, there are four mechanisms used by CLL cells to escape from the control of immune cells: (1) non-immunogenic tumor cell death; (2) expansion and recruitment of immunosuppressive cells, including T regulatory (T-reg) cells, M2 macrophages and myeloid-derived suppressor cells (MDSC); > (3) depletion and/or inhibition of antitumor immune cells such as Th1 T-cells and CD8+ cells; and (4) production of immunosuppressive soluble factors such as IL-10 and TGF-β [4]. These changes are highly relevant for the maintenance and progression of the tumor and contribute to the complex manifestations of the disease. Recently, it has been reported that immune microenvironment plays a significant role in progression of the disease in contrast to clonal evolution [5]. > At the end of the 90´s, the introduction of chemotherapy in combination with anti-CD20 monoclonal antibodies such as rituximab was an important step forward in CLL therapy and the outcome of patients significantly improved. However, most patients will eventually relapse. Importantly, CIT decreases the disease burden but, at the same time, exacerbates certain defects of an already dysfunctional immune system which further impacts patients' health, with increased infection morbidity and secondary neoplasms [6].

[8] Immune Dysregulation in Autism Spectrum Disorder: What Do We Know about It?

  • Authors: M. Robinson-Agramonte, Elena Noris García, Jarasca Fraga Guerra, Yamilé Vega Hurtado, Nicola Antonucci et al.
  • Year: 2022
  • Venue: International Journal of Molecular Sciences
  • URL: https://www.semanticscholar.org/paper/0d5e761dc4d912894a808ce3353286fc759f2ee5
  • DOI: 10.3390/ijms23063033
  • PMID: 35328471
  • PMCID: 8955336
  • Citations: 132
  • Influential citations: 1
  • Summary: Current insights into immune dysfunction in ASD are summarized, with particular reference to the impact of immunological factors related to the maternal influence of autism development; comorbidities influencing autism disease course and severity; and others factors with particular relevance, including obesity.
  • Evidence snippets:
  • Snippet 1 (score: 0.413) > Neuropsychiatric and neurodegenerative disorders display a biologically defined expression related to brain dysfunctions and age-related disease onset. The former, considered as a disturbed behavior and emotional state derived from the functional brain impairment, and the latter, viewed as an organic brain disease where the symptoms follow the damage of specific brain regions. Studies from different groups show biological evidence for the presence of common immune-mediated mechanisms overlapping both disease processes, although understandably with some distinctive characteristics. > Clinical and experimental evidence have argued similar mechanisms of innate immunity pathway signaling overlapping immune-pathological events in both neuropsychiatric and neurodegenerative disorders, characterized by the common influence of resident glial cells mediating inflammation via soluble molecules (mainly cytokines, chemokines, and complement proteins), which promote the recruitment of local immune cells and others coming from the peripheral compartment. To show this evidence, we refer to two pathologies occurring in the both extremes of the life: ASD, the main object of this review, and Parkinson disease (PD), following the main aspects of innate immunity relevant to both disorders and where the glial cells are the main cellular element. > In general, both disorders, ASD and PD, are related to brain dysfunctions, and in their particular context, genetic causes and risk factors play a central role in disease pathophysiology, severity, and disease progression besides the overlapping immunopathological mechanisms and molecular pathways. More than 100 candidate genes identified in ASD may converge as causal factors related to neuronal development, plasticity, synaptic structure, and performance [230,231]. Several genes and genomic regions, including alpha-synuclein (SNCA), parkinRBRE3 ubiquitin protein ligase (PARK2), chromosome 22q11deletion/DiGeorge region, and fragile X mental retardation 1 (FMR1) repeats, may be relevant to the development of both ASD and PD, with converging features related to synaptic function and neurogenesis. Both PD and ASD also show alterations and impairments at the synaptic level, representing early main disease phenotypes converging upon mechanisms active in the two diseases [232].

[9] X-linked lymphoproliferative disease type 1: a clinical and genetic update

  • Authors: Jiaxun Li, Luyu Lv, Qingqing Wei, Wenpeng Pang, Chunjuan He et al.
  • Year: 2025
  • Venue: Frontiers in Immunology
  • URL: https://www.semanticscholar.org/paper/1b22fc5c7707c76b775f2b5d18b5697b64432ff0
  • DOI: 10.3389/fimmu.2025.1620327
  • PMID: 40574867
  • PMCID: 12198186
  • Citations: 1
  • Summary: Establishing a definitive correlation between specific genotypes and clinical phenotypes remains challenging, but emerging evidence suggests a potential association, and underscores the critical need for further large-scale studies to elucidate this relationship.
  • Evidence snippets:
  • Snippet 1 (score: 0.411) > X-linked lymphoproliferative disease (XLP), also known as Duncan’s disease, is a primary immunodeficiency disorder linked to the X chromosome. In 1998, SH2D1A, which encodes the signaling lymphocyte activation molecule (SLAM)-associated protein (SAP), was identified as the first pathogenic gene associated with XLP. To date, more than 100 mutation sites in this gene have been documented. The disease is associated with infection with Epstein-Barr virus (EBV) and characterized by hemophagocytic lymphohistiocytosis (HLH), hypogammaglobulinemia, and lymphomas. Pathogenesis is intricately associated with cell type-specific SAP-SLAM signaling pathways. Particularly, the immune cell defects involve impaired T cell-B cell interactions, reduced cytotoxicity of Natural Killer (NK) cells, and abnormal development of Natural Killer T (NKT) cells. These factors collectively increase susceptibility to EBV and drive clinical manifestations in XLP type 1 (XLP1) patients. Although establishing a definitive correlation between specific genotypes and clinical phenotypes remains challenging, emerging evidence suggests a potential association. This underscores the critical need for further large-scale studies to elucidate this relationship. Given the current understanding of the pathophysiological mechanisms associated with XLP1, specific treatments to normalize SAP expression and restore immune tolerance in XLP1 patients play an important role. In addition to the necessity for long-term studies to verify the efficacy and safety of hematopoietic stem cell transplantation (HSCT), gene therapies currently under development, along with other emerging treatments, exhibit substantial promise for future clinical applications.

[10] Primer immunhiány és autoimmun betegségek

  • Authors: G. Műzes, Ferenc Sipos
  • Year: 2018
  • Venue: Orvosi Hetilap
  • URL: https://www.semanticscholar.org/paper/b4e357ef596804bffea77a9812d9704dbf2e4026
  • DOI: 10.1556/650.2018.31064
  • Summary: The case presented finally highlights that both the recognition of autoimmune diseases in association with Immunodeficiencies and the diagnosis of immunodefiency in those phenotypes with predominant autoimmunity could be challenging.
  • Evidence snippets:
  • Snippet 1 (score: 0.411) > Abstract: Primary immunodeficiencies consist of a group of genetically heterogeneous immune disorders affecting distinct elements of the innate and adaptive immune system. Patients with primary immunodeficiency are more prone to develop not only recurrent infections, but non-infectious complications, like inflammatory or granulomatous conditions, lymphoproliferative and solid malignancies, autoinflammatory disorders, and a broad spectrum of autoimmune diseases. The concomitant appearance of primary immunodeficiency and autoimmunity appears to be rather paradoxical, therefore making the diagnosis of immunodeficiency patients with autoimmune complications challenging. Mutations of one or more genes playing a fundamental role in immunoregulation and/or immune tolerance network are thought to be responsible for primary immunodeficiencies. The diverse immunological abnomalities along with the compensatory and excessive sustained inflammatory response result in tissue damage and finally in manifestation of organ-, cell-specific or systemic autoimmune diseases. Several forms of primary immunodeficiency disorders are characterized by a variety of specific autoimmune phenomena. This overview addresses the spectrum of autoimmune diseases associated with primary immunodeficiencies, and explores the molecular and cellular mechanisms underlying abnormalities of the immune system. The case presented finally highlights that both the recognition of autoimmune diseases in association with immunodeficiencies and the diagnosis of immunodefiency in those phenotypes with predominant autoimmunity could be challenging. Orv Hetil. 2018; 159(23): 908–918.

[11] Organoids in gastrointestinal diseases: from bench to clinic

  • Authors: Qinying Wang, Fanying Guo, Qinyuan Zhang, Tingting Hu, Yutao Jin et al.
  • Year: 2024
  • Venue: MedComm
  • URL: https://www.semanticscholar.org/paper/9b8880d8b9d45670da950197d7e353794f51d09e
  • DOI: 10.1002/mco2.574
  • PMID: 38948115
  • PMCID: 11214594
  • Citations: 12
  • Summary: A comprehensive and systematical depiction of organoids models is drawn, providing a novel insight into the utilization of organoids models from bench to clinic and clinical adhibition.
  • Evidence snippets:
  • Snippet 1 (score: 0.410) > Organoids models offer a robust platform for investigating the potential mechanisms of GI diseases and evaluating potential therapeutic interventions.By culturing organoids derived from patients' tissues or stem cells, researchers can delve into disease-specific cellular and molecular pathways, encompassing aberrant cell signaling, perturbed immune responses, and dysfunctional metabolic processes.These disease-specific phenotypes enable the study of disease progression, screening of prospective therapeutics, as well as identification of novel drug targets and mechanisms of action for GI diseases in a clinically relevant context.

[12] [Primary immunodeficiency and autoimmune diseases].

  • Authors: G. Műzes, F. Sipos
  • Year: 2018
  • Venue: Orvosi hetilap
  • URL: https://www.semanticscholar.org/paper/14a8db6d56e353b48c82e510366b6fe608ff76bb
  • DOI: 10.1556/650.2018.31064
  • PMID: 29860882
  • Citations: 5
  • Summary: The case presented finally highlights that both the recognition of autoimmune diseases in association with Immunodeficiencies and the diagnosis of immunodefiency in those phenotypes with predominant autoimmunity could be challenging.
  • Evidence snippets:
  • Snippet 1 (score: 0.409) > Primary immunodeficiencies consist of a group of genetically heterogeneous immune disorders affecting distinct elements of the innate and adaptive immune system. Patients with primary immunodeficiency are more prone to develop not only recurrent infections, but non-infectious complications, like inflammatory or granulomatous conditions, lymphoproliferative and solid malignancies, autoinflammatory disorders, and a broad spectrum of autoimmune diseases. The concomitant appearance of primary immunodeficiency and autoimmunity appears to be rather paradoxical, therefore making the diagnosis of immunodeficiency patients with autoimmune complications challenging. Mutations of one or more genes playing a fundamental role in immunoregulation and/or immune tolerance network are thought to be responsible for primary immunodeficiencies. The diverse immunological abnomalities along with the compensatory and excessive sustained inflammatory response result in tissue damage and finally in manifestation of organ-, cell-specific or systemic autoimmune diseases. Several forms of primary immunodeficiency disorders are characterized by a variety of specific autoimmune phenomena. This overview addresses the spectrum of autoimmune diseases associated with primary immunodeficiencies, and explores the molecular and cellular mechanisms underlying abnormalities of the immune system. The case presented finally highlights that both the recognition of autoimmune diseases in association with immunodeficiencies and the diagnosis of immunodefiency in those phenotypes with predominant autoimmunity could be challenging. Orv Hetil. 2018; 159(23): 908-918.

[13] Hyper-IgE Syndrome: A Case Report with Insights from Bioinformatics Analysis of Key Pathways and Genes

  • Authors: Juan Li, Wei Han, Meng-Yu Zhang, Jia-Qi Fan, Guo-Dong Li et al.
  • Year: 2025
  • Venue: Infection and Drug Resistance
  • URL: https://www.semanticscholar.org/paper/c9acdd456b694d70efd877736518d7d6c2f818f6
  • DOI: 10.2147/IDR.S507797
  • PMID: 40162035
  • PMCID: 11952148
  • Summary: This study identified IL6, CDH2, and CLDN1 as key factors in HIES progression, suggesting naive B cells and dormant mast cells may be involved, suggesting naive B cells and dormant mast cells may be involved.
  • Evidence snippets:
  • Snippet 1 (score: 0.408) > Researchers have utilized gene sequencing techniques to identify multiple mutation sites associated with HIES, further exploring the dysregulation of immune system signaling pathways. 4,11,12 Current diagnostic and therapeutic approaches primarily rely on clinical evaluation and symptom management, which often fail to address the underlying genetic and molecular mechanisms of the disease. 13 Although advancements in genetic sequencing have provided some insights, the complexity of HIES pathophysiology remains inadequately understood. Bioinformatics offers a powerful approach to uncovering the genetic and molecular mechanisms of rare diseases like HIES, which may not be evident through clinical observation alone. 1 By integrating genomic, transcriptomic, and proteomic data, novel genetic variants and molecular pathways associated with HIES can be identified. 1,14 Whole-exome sequencing (WES) is employed to detect mutations in key immune-related genes, while RNA sequencing (RNA-seq) analysis provides insights into differential gene expression patterns, highlighting dysregulated immune signaling pathways and offering a comprehensive view of the molecular landscape of HIES. 9 Although HIES is a rare disorder, as our understanding of it deepens, we look forward to providing more effective treatment options and strategies to improve the quality of life for patients. Future research will continue to unveil the pathogenesis of HIES and explore novel therapeutic approaches to help patients better manage and cope with this condition. By advancing our knowledge in this field, we aim to enhance the overall care and outcomes for individuals affected by HIES. In this report, we presented a case diagnosed with HIES and conducted bioinformatics and immune infiltration analyses to reveal underlying genetic variants and molecular pathways that were difficult to detect through traditional clinical observation. By leveraging bioinformatics tools, this study aimed to elucidate the complex mechanisms behind HIES, ultimately contributing to the identification of new therapeutic targets and enhancing the overall understanding of this rare disease.

[14] Editorial: Human Disorders of PI3K Biology

  • Authors: C. Lucas, S. Tangye
  • Year: 2020
  • Venue: Frontiers in Immunology
  • URL: https://www.semanticscholar.org/paper/1bed33976a1ac681effe494bb0dc6e5633b70c3b
  • DOI: 10.3389/fimmu.2020.617464
  • PMID: 33329612
  • PMCID: 7732539
  • Citations: 2
  • Summary: This Research Topic, 13 manuscripts cover a range of subjects, mostly centered around findings in APDS and cancer, and structural biology concepts for Class IA PI3K variants in cancer and immunodeficiency are reviewed.
  • Evidence snippets:
  • Snippet 1 (score: 0.406) > presentation for these conditions usually begins with recurrent respiratory infections very early in life, followed by lymphoproliferative disorders, and then with gastrointestinal conditions and autoimmune cytopenias. Inhibition of mechanistic target of rapamycin (mTOR), a regulator of cell proliferation and growth downstream of PI3Kd, with rapamycin (sirolimus) is effective at mitigating lymphoproliferative disease in APDS but has had limited effect on managing other features of disease. Coulter and Cant discuss in more depth potential therapeutic approaches. APDS patients have various clinical manifestations with some patients being asymptomatic while others exhibiting recurrent infections and antibody defects. Historically, conventional therapies such as immunoglobulin replacement therapy, HSCT, and antimicrobial prophylaxis have been used as treatments. However, the heterogeneity of disease presentation requires a more tailored approach which can be achieved through the use of selective PI3Kd inhibitors such as Leniolisib. > Wentink et al. provide new data on the phenotype of CD8 + T cells in APDS as it relates to exhaustion. As a contributing mechanism for increased susceptibility to infections and dysregulated immune responses, CD8 + T cell exhaustion due to chronic T cell stimulation and proliferation is relevant for APDS pathology. Cannons et al. provide a perspective piece on the survival, differentiation, and function of CD8 + T cells in APDS. Despite having a normal or even elevated frequency of Epstein-Barr Virus (EBV)-specific CD8 + T cells, APDS patients have defects in controlling EBV and cytomegalovirus viremia. While seemingly not affecting the development of antigenspecific T cells, hyperactive PI3Kd impacts CD8 + T cell proliferation, differentiation, and survival, which have direct relevance for their function in vivo. Cohen covers consequences of herpesvirus infections in APDS in more depth. Herpesviruses can directly bind surface receptors that activate the PI3Kd pathway and further modulate signaling through viral proteins.

[15] T Cell Repertoire Analysis as a Molecular Signature of the Spectrum of T-LGL Lymphoproliferative Disorders: Tracing the Literature

  • Authors: E. Stalika, Ioannis Tsamesidis
  • Year: 2025
  • Venue: Current Issues in Molecular Biology
  • URL: https://www.semanticscholar.org/paper/ed70f16f28da3ed8937af55e88d5ef33b22cdd0e
  • DOI: 10.3390/cimb47040264
  • PMID: 40699662
  • PMCID: 12025433
  • Summary: In the ontogeny and evolution of T-LGL leukemia, repertoire limits, public clonotypes, and clonal drift all clearly show selection by limited antigens, and the progression from a polyclonal cytotoxic response to the emergence of T-LGL leukemia is slow.
  • Evidence snippets:
  • Snippet 1 (score: 0.404) > Cytotoxic T lymphocyte lymphoproliferative disorders may be chronic or transient and occur in the context of heterogeneous clinical entities, e.g., coexisting with viral infections, autoimmune disorders or developing after organ or allogeneic hematopoietic cell transplantation [6][7][8]10,12,15,16,[59][60][61][62]. Disorders in the mechanism of T lymphocyte apoptosis are believed to lead to the development of T lymphoproliferative diseases [34,[63][64][65]; however, the ontogeny of these diseases has not been fully elucidated. It is believed that chronic persistent antigenic stimulation or some perturbation in the mechanism of T-cytotoxic lymphocyte apoptosis maintains the persistence of clonal outgrowths and eventual disease manifestation [28,66,67]. The nature of the antigens involved remains to be determined. > In the above context, the analysis of T cell receptor gene rearrangements in these entities may provide clues of the role of antigen in pathogenesis and possibly disease progression, assuming that intense antigenic stimulation initially leads to polyclonal hyperplasia and, under as yet unknown conditions (which could include genetic predisposition), may result in clonal disease, e.g., T-LGL leukemia [68]. > In the last decade, the advent of high-throughput sequencing methodology and its application to T cell receptor repertoire studies in a wide range of physiological and pathological conditions has revolutionized immunogenetics [10,[69][70][71][72][73][74][75][76]. A major challenge for the scientific community is the standardization of the experimental procedure and the development of bioinformatics approaches specifically designed for the analysis of immunogenetic data derived from high-throughput sequencing methods.

[16] Integration of Immunome With Disease-Gene Network Reveals Common Cellular Mechanisms Between IMIDs and Drug Repurposing Strategies

  • Authors: Abhinandan Devaprasad, T. Radstake, A. Pandit
  • Year: 2019
  • Venue: Frontiers in Immunology
  • URL: https://www.semanticscholar.org/paper/da3d168a672593e5da82bb4178e49118bc4b3170
  • DOI: 10.3389/fimmu.2021.669400
  • PMID: 34108969
  • PMCID: 8181425
  • Citations: 13
  • Summary: The method identified top DACs, DAGs, common pathways, and proposed potential drug repurposing targets between IMIDs and built the DIME tool, paving way for future (pre-)clinical research.
  • Evidence snippets:
  • Snippet 1 (score: 0.404) > Objective Development and progression of immune-mediated inflammatory diseases (IMIDs) involve intricate dysregulation of the disease associated genes (DAGs) and their expressing immune cells. Due to the complex molecular mechanism, identifying the top disease associated cells (DACs) in IMIDs has been challenging. Here, we aim to identify the top DACs and DAGs to help understand the cellular mechanism involved in IMIDs and further explore therapeutic strategies. Method Using transcriptome profiles of 40 different immune cells, unsupervised machine learning, and disease-gene networks, we constructed the Disease-gene IMmune cell Expression (DIME) network, and identified top DACs and DAGs of 12 phenotypically different IMIDs. We compared the DIME networks of IMIDs to identify common pathways between them. We used the common pathways and publicly available drug-gene network to identify promising drug repurposing targets. Result We found CD4+Treg, CD4+Th1, and NK cells as top DACs in the inflammatory arthritis such as ankylosing spondylitis (AS), psoriatic arthritis, and rheumatoid arthritis (RA); neutrophils, granulocytes and BDCA1+CD14+ cells in systemic lupus erythematosus and systemic scleroderma; ILC2, CD4+Th1, CD4+Treg, and NK cells in the inflammatory bowel diseases (IBDs). We identified lymphoid cells (CD4+Th1, CD4+Treg, and NK) and their associated pathways to be important in HLA-B27 type diseases (psoriasis, AS, and IBDs) and in primary-joint-inflammation-based inflammatory arthritis (AS and RA). Based on the common cellular mechanisms, we identified lifitegrast as potential drug repurposing candidate for Crohn’s disease, and other IMIDs. Conclusion Our method identified top DACs, DAGs, common pathways, and proposed potential drug repurposing targets between IMIDs. To extend our method to other diseases, we built the DIME tool. Thus paving way for future (pre-)clinical research.

[17] Mitochondrial Dysfunction in Diabetes: Shedding Light on a Widespread Oversight

  • Authors: F. Iheagwam, A. J. Joseph, E. D. Adedoyin, Olawumi Toyin Iheagwam, Samuel Akpoyowvare Ejoh
  • Year: 2025
  • Venue: Pathophysiology
  • URL: https://www.semanticscholar.org/paper/dbf8042761c1a5fc50f8cd894cc498505abac7cb
  • DOI: 10.3390/pathophysiology32010009
  • PMID: 39982365
  • PMCID: 12077258
  • Citations: 26
  • Summary: This review aims to elucidate the complex link between mitochondrial dysfunction and diabetes, covering the spectrum of diabetes types, the role of mitochondria in insulin resistance, highlighting pathophysiological mechanisms, mitochondrial DNA damage, and altered mitochondrial biogenesis and dynamics.
  • Evidence snippets:
  • Snippet 1 (score: 0.403) > The landscape of DM research is continuously evolving, with emerging technologies and approaches offering new insights into the pathophysiology of the disease and potential therapeutic targets. Advancements in omics technologies, encompassing genomes, transcriptomics, proteomics, and metabolomics, have transformed the molecular mechanisms underlying DM [134]. High-throughput sequencing techniques enable comprehensive analysis of genetic variants, gene expression profiles, protein abundance, and metabolite levels associated with DM and its complications [135]. Single-cell omics approaches provide unprecedented resolution and granularity, allowing researchers to dissect cellular heterogeneity and identify novel cell types, subpopulations, and signalling pathways involved in DM pathogenesis. Integrating multi-omics data sets offers a systems-level perspective of DM, unravelling complex networks of molecular interactions and regulatory circuits underlying disease progression [136]. > In addition to omics technologies, advances in imaging modalities, such as MRI, PET, and optical imaging, enable non-invasive visualisation and quantification of metabolic, functional, and structural changes. Molecular imaging probes targeting specific biomarkers and metabolic pathways provide valuable insights into disease mechanisms and treatment responses in preclinical and clinical settings [85]. Despite significant progress in DM research, numerous unanswered questions and knowledge gaps persist, hindering the ability to develop effective prevention and treatment strategies. Key areas requiring further investigation include the role of epigenetics, environmental factors, and the microbiome in DM susceptibility and progression. Moreover, the interaction between environmental cues and genetic predisposition remains incompletely understood, highlighting the need for comprehensive multi-omics studies and large-scale epidemiological analyses to identify gene-environment interactions and modifiable risk factors for DM [137]. Furthermore, the heterogeneity of DM phenotypes and clinical outcomes poses a challenge for personalised medicine approaches, necessitating robust biomarkers and predictive models to stratify patients based on disease subtypes, prognosis, and treatment response [138].

[18] Exploring the molecular mechanisms of subarachnoid hemorrhage and potential therapeutic targets: insights from bioinformatics and drug prediction

  • Authors: Yi Liu, Yang Zhang, Huan Wei, Li Wang, Lishang Liao
  • Year: 2025
  • Venue: Scientific Reports
  • URL: https://www.semanticscholar.org/paper/19a91d9c8cabec6a5a186729d545077e252ecb67
  • DOI: 10.1038/s41598-025-97642-8
  • PMID: 40229542
  • PMCID: 11997208
  • Summary: The findings not only elucidate the molecular mechanisms underlying SAH but also provide robust bioinformatics and experimental evidence supporting IRN as a promising therapeutic candidate, offering novel insights for future intervention strategies in SAH.
  • Evidence snippets:
  • Snippet 1 (score: 0.403) > involved in SAH pathology. As a result, our understanding of the cellular composition and microenvironment in SAH remains incomplete 8 . > Advances in bioinformatics provide powerful tools to analyze large-scale gene expression data and understand complex biological processes. By integrating transcriptomic data with immune cell infiltration analysis, we can gain a deeper understanding of the molecular mechanisms underlying SAH and identify potential key genes as therapeutic targets 9,10 . Previous studies have indicated that inflammation, oxidative stress, and cell death play crucial roles in the development of SAH, processes that are often closely associated with changes in specific cell types and immune responses 11 . > The goal of this study is to explore the molecular mechanisms of SAH, with a focus on immune cell infiltration and its role in disease progression. We aim to identify key genes and signaling pathways associated with SAH and investigate potential therapeutic strategies. Specifically, we will examine Isorhynchophylline (IRN) as a potential treatment for SAH and analyze its effects on relevant targets and signaling pathways. Through a comprehensive understanding of the pathological features of SAH, this study aims to provide valuable insights into future clinical interventions and treatment strategies.

[19] New therapeutic targets in rare genetic skeletal diseases

  • Authors: M. Briggs, Peter A. Bell, M. Wright, K. A. Pirog
  • Year: 2015
  • Venue: Expert Opinion on Orphan Drugs
  • URL: https://www.semanticscholar.org/paper/1363107f71ae6d2d60abca471cddf3da5d13644b
  • DOI: 10.1517/21678707.2015.1083853
  • PMID: 26635999
  • PMCID: 4643203
  • Citations: 37
  • Influential citations: 1
  • Summary: An overview of disease mechanisms that are shared amongst groups of different GSDs and potential therapeutic approaches that are under investigation are described to generate critical mass for the identification and validation of novel therapeutic targets and biomarkers.
  • Evidence snippets:
  • Snippet 1 (score: 0.403) > proteins of the cartilage ECM such as type II collagen [50]. However, emerging knowledge suggests that the primary genetic defect may be less important than the cells' response to the expression of the mutant gene product [107]. Moreover, the largely overlooked response of a cell (i.e. chondrocyte) to the abnormal extracellular environment is also important for disease progression as illustrated by several GSDs discussed in this review. > It is important that 'omics'-based approaches and technologies are systematically applied to the study of rare GSDs so that definitive reference profiles and disease signatures are generated for each phenotype. These can then be used in a Systems Biology approach to identify both common and dissimilar pathological signatures and disease mechanisms. This approach is entirely dependent upon relevant in vitro and in vivo models (and also novel 'disease-mechanism phenocopies' [107]) for testing new diagnostic and prognostic tools and for determining the molecular mechanisms that underpin the pathophysiology so that effective therapeutic treatments can be developed and validated. This approach will eventually lead to personalized treatments and care strategies centred on shared disease mechanisms with the use of relevant biomarkers to monitor the efficacy of treatment and disease progression. > It is vital that all relevant stakeholders are involved from the outset in defining the appropriate outcomes of any potential therapeutic regime. The perceptions of a successful therapy can differ widely between the clinical academic community and the relevant patient-support groups and it is vital that there is engagement on all these issues. > In summary, the identification of causative genes and mutations for GSDs over the last 20 years, coupled with the generation and in-depth analysis of a plethora of relevant cell and mouse models, has derived new knowledge on disease mechanisms and suggested potential therapeutic targets. The fast-evolving hypothesis that clinically disparate diseases can share common disease mechanisms is a powerful concept that will generate critical mass for the identification and validation of novel therapeutic targets and biomarkers.

[20] Navigating Drug-Induced Lung Disease (DILD): A Comprehensive Review on Management and Prevention Strategies

  • Authors: Srinivasulareddy Annareddy, B. Ghewade, Ulhas S Jadhav, Pankaj B Wagh
  • Year: 2024
  • Venue: Cureus
  • URL: https://www.semanticscholar.org/paper/0b389cda78d09ed43d6169972b6b2948590d3a59
  • DOI: 10.7759/cureus.69954
  • PMID: 39445304
  • PMCID: 11496594
  • Citations: 1
  • Influential citations: 1
  • Summary: This review provides a comprehensive overview of DILD, focusing on its definition, pathophysiology, and clinical implications, and examines future research directions and emerging therapies, aiming to enhance the understanding and management of DILD.
  • Evidence snippets:
  • Snippet 1 (score: 0.402) > The pathophysiology of drug-induced lung injury (DILI) is complex, involving various mechanisms that can lead to pulmonary complications. These mechanisms can be broadly categorized into two main types: direct toxicity and immune-mediated toxicity [1]. Direct toxicity occurs when a drug or its metabolites cause cellular damage without involving the immune system. This can happen through several pathways, such as producing reactive metabolites, oxidative stress, and direct cellular injury. For example, drugs like bleomycin can generate reactive oxygen species (ROS), leading to oxidative stress, cell injury, and apoptosis. Additionally, certain drugs can directly damage alveolar epithelial cells or endothelial cells, causing inflammation and pulmonary edema [13]. Immune-mediated lung injury involves an abnormal immune response triggered by drug exposure. This can manifest through allergic reactions, where drugs act as haptens and bind to proteins, eliciting an immune response. This can result in drug-induced pneumonitis, characterized by the infiltration of immune cells and cytokine release. Some medications can also induce systemic cytokine release, causing lung inflammation and damage, such as capillary leakage and pulmonary edema [14]. Genetic factors significantly influence susceptibility to drug-induced lung injury. Variability in drug metabolism and immune response can lead to idiosyncratic reactions, which are unpredictable and not dose-dependent. Genetic polymorphisms in genes encoding drug-metabolizing enzymes can affect the production of toxic metabolites, while preexisting lung conditions or genetic predispositions may increase the risk of developing DILI. Differences in immune system function among individuals can also result in varying responses to drugs, with some patients experiencing severe immune-mediated lung injury while others do not [15]. Understanding the pathophysiology of drug-induced lung injury, including the influence of genetic predisposition and idiosyncratic reactions, is crucial for identifying at-risk patients and developing effective prevention and management strategies. Ongoing research is essential to elucidate these mechanisms further and improve clinical outcomes for patients affected by drug-induced lung injury [16].

Notes

  • This provider combines search_papers_by_relevance with snippet_search.
  • No synthesis or second-stage model call is performed.
Falcon
1. Disease Information
Edison Scientific Literature 29 citations 2026-04-20T14:16:11.418917

1. Disease Information

1.1 Concise overview

CD27-related lymphoproliferative and immune disorder is a monogenic inborn error of immunity caused by biallelic loss-of-function variants in CD27 (TNFRSF7), characterized by selective susceptibility to Epstein–Barr virus (EBV) with chronic/persistent EBV viremia and EBV-driven complications including lymphoproliferation, hemophagocytic lymphohistiocytosis (HLH), and EBV-associated lymphomas, often accompanied by hypogammaglobulinemia and defective T cell–dependent humoral immunity. (ghosh2020extendedclinicaland pages 2-3, tangye2020primaryimmunodeficienciesreveal pages 7-8, salzer2013combinedimmunodeficiencywith pages 1-2)

1.2 Key identifiers (from available evidence)

  • Disease entity name (OMIM): Lymphoproliferative syndrome 2 (also written LPS2). (golchehre2023newpresentationof pages 1-2, alkhairy2015novelmutationsin pages 1-2)
  • OMIM ID: 615122 (reported in multiple sources within retrieved evidence). (golchehre2023newpresentationof pages 1-2, alkhairy2015novelmutationsin pages 1-2)
  • Causal gene: CD27 / TNFRSF7, locus 12p13.31. (kishore2020novelmutationin pages 2-3, golchehre2023newpresentationof pages 1-2, alkhairy2015novelmutationsin pages 1-2)
  • IUIS context: discussed as an immune dysregulation/EBV-susceptibility IEI category in a 2023 case report. (golchehre2023newpresentationof pages 1-2)

Not found in retrieved evidence: MONDO ID, Orphanet ID, ICD-10/ICD-11 codes, MeSH descriptor (would require direct OMIM/Orphanet/MONDO retrieval beyond the obtained full texts).

1.3 Synonyms and alternative names

  • CD27 deficiency (common in clinical genetics/immunology literature). (alkhairy2015novelmutationsin pages 4-5)
  • Lymphoproliferative syndrome 2 (LPS2). (golchehre2023newpresentationof pages 1-2, alkhairy2015novelmutationsin pages 1-2)
  • Descriptive presentations used in titles: “combined immunodeficiency with life-threatening EBV-associated lymphoproliferative disorder”. (salzer2013combinedimmunodeficiencywith pages 1-2)

1.4 Evidence type

Knowledge is derived primarily from aggregated disease-level cohort studies and case series (e.g., multicenter cohorts) plus individual case reports adding phenotypic expansions. (ghosh2020extendedclinicaland pages 2-3, alkhairy2015novelmutationsin pages 4-5, golchehre2023newpresentationof pages 1-2)


2. Etiology

2.1 Disease causal factors

Genetic cause: biallelic pathogenic variants in CD27 (TNFRSF7) causing absent or markedly reduced CD27 surface expression and functional loss of CD27–CD70 costimulation. (montfrans2012cd27deficiencyis pages 2-4, alkhairy2015novelmutationsin pages 7-9, ghosh2020extendedclinicaland pages 2-3)

Inheritance pattern: autosomal recessive; many patients reported from consanguineous families, with heterozygous relatives typically unaffected in early reports. (montfrans2012cd27deficiencyis pages 2-4, alkhairy2015novelmutationsin pages 1-2)

2.2 Risk factors

  • Genetic: biallelic CD27 variants (see Variant Table below). (alkhairy2015novelmutationsin pages 4-5, alkhairy2015novelmutationsin pages 1-2)
  • Infectious trigger: EBV infection is a major precipitant of clinical disease (viremia, LPD, HLH, lymphoma). (ghosh2020extendedclinicaland pages 2-3, salzer2013combinedimmunodeficiencywith pages 1-2)

2.3 Protective factors / gene–environment interactions

No protective variants or environmental protective factors were identified in the retrieved evidence. The dominant gene–environment interaction described is that EBV exposure triggers severe disease manifestations in genetically susceptible hosts (CD27 deficiency). (ghosh2020extendedclinicaland pages 2-3, salzer2013combinedimmunodeficiencywith pages 1-2)


3. Phenotypes

A multicenter cohort (CD27 n=33 within a 49-patient CD27/CD70 cohort) reported: EBV-positive at diagnosis ~90%, lymphoproliferation 70%, lymphoma 43%, autoinflammatory features 43%, and HLH in 9 CD27-deficient patients. (ghosh2020extendedclinicaland pages 2-3)

A separate 17-patient CD27 cohort reported mortality 29%, and that very high EBV plasma loads were often seen (up to ~5×10^6–8×10^6 copies/mL in a table excerpt). (alkhairy2015novelmutationsin pages 5-6, alkhairy2015novelmutationsin pages 7-9)

Feature Description HPO term(s) Frequency/statistics (with cohort/source) Notes
EBV susceptibility / EBV positivity Marked susceptibility to Epstein-Barr virus with chronic/persistent viremia and EBV-driven immune dysregulation HP:0012378 Elevated circulating Epstein-Barr virus load; HP:0002731 Recurrent viral infections EBV-positive at diagnosis in 90% of the CD27/CD70 cohort; in Alkhairy 2015, high EBV loads were documented in 11/12 tested and plasma loads reached up to ~5×10^6–8×10^6 copies/mL (ghosh2020extendedclinicaland pages 2-3, alkhairy2015novelmutationsin pages 5-6) Core disease-defining feature; often precedes lymphoproliferation and lymphoma
Lymphoproliferation Persistent or recurrent EBV-driven lymphadenopathy/hepatosplenomegaly and benign or malignant lymphoid expansion HP:0002716 Lymphadenopathy; HP:0001433 Hepatosplenomegaly; HP:0002841 Lymphoproliferative disorder Lymphoproliferation reported in 70% of the multicenter cohort (49 total; 33 CD27-deficient) (ghosh2020extendedclinicaland pages 2-3) Can mimic CVID, ALPS, chronic active EBV, or lymphoma
Lymphoma Increased risk of EBV-associated lymphoma, including Hodgkin and non-Hodgkin lymphoma HP:0002665 Lymphoma; HP:0012197 Hodgkin lymphoma; HP:0100827 Non-Hodgkin lymphoma Lymphoma in 43% of the Ghosh 2020 cohort; cases in Alkhairy 2015 included DLBCL, extranodal EBV-related LPD, and classical Hodgkin lymphoma (ghosh2020extendedclinicaland pages 2-3, alkhairy2015novelmutationsin pages 5-6) Malignant transformation is a major indication for HSCT
Hemophagocytic lymphohistiocytosis (HLH) Hyperinflammatory episodes triggered by EBV with hemophagocytosis/HLH phenotype HP:0003125 Hemophagocytosis; HP:0032243 Hemophagocytic lymphohistiocytosis 9 CD27-deficient patients developed HLH in the Ghosh cohort; HLH also described in earlier cases and pooled reviews (ghosh2020extendedclinicaland pages 2-3, kishore2020novelmutationin pages 4-5) Severe, potentially life-threatening presentation
Hypogammaglobulinemia / antibody deficiency Low immunoglobulins and impaired humoral immunity, sometimes CVID-like HP:0004313 Decreased circulating IgG level; HP:0010701 Hypogammaglobulinemia; HP:0002845 Functional abnormality of humoral immunity Primary hypogammaglobulinemia in 3/17 in Alkhairy 2015; secondary/treatment-related hypogammaglobulinemia also common (rituximab/chemotherapy) (alkhairy2015novelmutationsin pages 4-5) May be present at onset or emerge after EBV disease/treatment
Impaired vaccine / protein antigen responses Defective T-cell–dependent antibody responses despite some preserved vaccine responses to other antigens HP:0034335 Abnormality of immune response to vaccination Montfrans 2012: severely impaired antibody responses to repeated protein antigens (rabies, tetanus), despite preserved responses to polysaccharide/conjugate vaccines (montfrans2012cd27deficiencyis pages 6-7) Supports combined immunodeficiency rather than isolated antibody deficiency
Memory B-cell defect Abnormal or reduced memory B-cell generation; absent/reduced CD27 expression on B cells HP:0011839 Abnormal B-cell subset distribution; HP:0011813 Reduced memory B cell count Ghosh 2020 reported aberrant generation of memory B and T cells; Alkhairy 2015 and related cases documented absent/reduced CD27 expression and reduced memory-cell compartments (ghosh2020extendedclinicaland pages 2-3, alkhairy2015novelmutationsin pages 7-9) CD27 itself is a canonical memory B-cell marker, so interpretation requires genotype context
T-cell dysfunction / paucity of EBV-specific T cells Impaired expansion and effector differentiation of EBV-specific CD8 T cells; reduced cytotoxic antiviral immunity HP:0003202 Abnormal T-cell proliferation; HP:0011832 Abnormality of CD8-positive T cells Ghosh 2020: paucity of EBV-specific T cells and impaired CD8 effector function; Montfrans 2012: reduced IL-2 production by EBV-specific CD8 T cells (ghosh2020extendedclinicaland pages 2-3, montfrans2012cd27deficiencyis pages 6-7) Mechanistically central to failure of EBV control
NK / iNKT abnormalities In some severe patients, reduced NK-cell function and/or low iNKT cells HP:0011837 Abnormal natural killer cell count; HP:0011838 Abnormal natural killer cell function Salzer 2013: in severely affected patients, iNKT-cell numbers and NK-cell function were reduced; Alkhairy 2015 reported reduced NK/NKT function in 5/7 measured (alkhairy2015novelmutationsin pages 7-9) Not universal; may correlate with more severe phenotypes
Recurrent respiratory infections Recurrent sinopulmonary infections, often preceding EBV-LPD recognition HP:0002205 Recurrent respiratory infections Frequent across reports; highlighted in case reports and pooled reviews (kishore2020novelmutationin pages 2-3, kishore2020novelmutationin pages 4-5) Often leads initially to a CVID diagnosis
Bronchiectasis Chronic airway damage from recurrent respiratory infections HP:0002110 Bronchiectasis Reported in the Kishore 2020 case with long-standing recurrent infections and hypogammaglobulinemia (kishore2020novelmutationin pages 2-3) Represents chronic morbidity from delayed diagnosis
Hepatosplenomegaly Enlarged liver and spleen, often with EBV-LPD HP:0001433 Hepatosplenomegaly Seen in Montfrans 2012 and Kishore 2020 case descriptions (montfrans2012cd27deficiencyis pages 2-4, kishore2020novelmutationin pages 2-3) Common accompaniment of lymphoproliferation/HLH
Uveitis / inflammatory complications Immune dysregulation can include ocular and systemic inflammatory disease HP:0000554 Uveitis; HP:0002721 Immune dysregulation EBV-associated uveitis reported in Montfrans 2012; autoinflammatory features occurred in 43% of the Ghosh cohort (montfrans2012cd27deficiencyis pages 2-4, ghosh2020extendedclinicaland pages 2-3) Broadens phenotype beyond infection and malignancy
Autoinflammation Periodic fever, arthritis, uveitis, and other inflammatory manifestations HP:0012649 Autoinflammation; HP:0001945 Fever; HP:0001369 Arthritis Autoinflammatory features in 21/49 overall (43%) in Ghosh 2020 (ghosh2020extendedclinicaland pages 2-3) Important because disease may present as immune dysregulation rather than infection alone
Coronary ectasia / aneurysm Unusual cardiovascular inflammatory phenotype reported in a recent child with CD27 deficiency HP:0031364 Coronary artery aneurysm; HP:0031363 Coronary artery ectasia Single 2023 case report of a 20-month-old boy with coronary ectasia/aneurysm plus EBV-associated lymphoma and COVID-19 (golchehre2023newpresentationof pages 1-2, golchehre2023newpresentationof pages 2-4) Recent phenotype expansion; causality uncertain (EBV, lymphoma, inflammation, or CD27 deficiency itself)
Mortality Substantial disease-related mortality without curative treatment in severe cases HP:0003826 Reduced life expectancy Mortality 29% in Alkhairy 2015 (approximately 5/17); two of eight died in Salzer 2013; pooled review summarized mortality as 30% (6/18) (alkhairy2015novelmutationsin pages 4-5, kishore2020novelmutationin pages 4-5) Deaths attributed to malignancy, sepsis, aplastic anemia, hepatic failure, and severe EBV disease
Response to rituximab Anti-CD20 B-cell depletion can reduce EBV load and improve EBV-LPD/HLH, sometimes transiently HP:0031370 Abnormal response to treatment Rituximab used in 6/17 in Alkhairy 2015; favorable but sometimes transient responses reported; Salzer 2013 reported repeated anti-CD20 therapy in one patient (alkhairy2015novelmutationsin pages 4-5, alkhairy2015novelmutationsin pages 1-2) Useful for EBV-driven B-cell disease but not curative
HSCT outcome Allogeneic HSCT is the only curative immune reconstitution approach for severe disease HP:0012337 Abnormality of immune system physiology Ghosh 2020: 19 patients underwent allogeneic HSCT with 95% overall survival; Alkhairy 2015: 3/17 received cord blood HSCT and were alive; Salzer 2013: 2 underwent HSCT successfully (ghosh2020extendedclinicaland pages 2-3, alkhairy2015novelmutationsin pages 4-5, alkhairy2015novelmutationsin pages 7-9) Strong real-world evidence supporting HSCT in severe EBV-LPD/lymphoma or refractory disease

Table: This table summarizes the major clinical features of CD27-related lymphoproliferative and immune disorder, with suggested HPO terms and quantitative observations from key cohorts and case reports. It is useful for knowledge-base curation because it links phenotype labels to disease frequency, mechanism-relevant findings, and treatment context.

Additional phenotype expansions (2023–2024 prioritized)

A 2023 case report described a 20-month-old with CD27 deficiency and EBV-associated lymphoma plus coronary artery ectasia/aneurysm (Kawasaki-like phenotype) and SARS-CoV-2 infection, which the authors presented as an expansion beyond the canonical EBV phenotype spectrum. (golchehre2023newpresentationof pages 1-2, golchehre2023newpresentationof pages 2-4)


4. Genetic / Molecular Information

4.1 Causal gene

  • Gene: CD27 (TNFRSF7), TNF receptor superfamily costimulatory receptor. (tangye2020primaryimmunodeficienciesreveal pages 7-8, golchehre2023newpresentationof pages 1-2)

4.2 Pathogenic variants (examples)

Multiple pathogenic variants (nonsense and missense) have been reported across cohorts, including c.24G>A (p.W8X), p.C53Y, p.C10X, p.R78W, p.C96Y, p.R107C, p.W110X, and additional novel alleles across multicenter studies. (montfrans2012cd27deficiencyis pages 2-4, alkhairy2015novelmutationsin pages 4-5, alkhairy2015novelmutationsin pages 7-9)

Variant (cDNA/protein as reported) Variant type Inheritance / zygosity Key phenotype highlights Key treatment / outcome notes Primary source(s) with year / journal / URL
c.24G>A, p.W8X Nonsense / truncating Homozygous AR in affected siblings; heterozygous carrier parents/unaffected sib Persistent symptomatic EBV viremia; severe EBV-driven lymphadenopathy; fever; hepatosplenomegaly; EBV-associated uveitis; hypogammaglobulinemia with impaired T-cell–dependent antibody responses; one sibling died of aplastic anemia with sepsis. EBV detected in purified B cells; viral loads reported as ~3000 and 2050 copies/µg DNA in one report. Broader pooled reports associate this variant with very high EBV loads and EBV-LPD/lymphoma. (montfrans2012cd27deficiencyis pages 2-4, montfrans2012cd27deficiencyis pages 6-7, alkhairy2015novelmutationsin pages 1-2) Immunoglobulin replacement used in surviving patient with stabilization; no HSCT/rituximab described in Montfrans excerpt. Included among variants in later pooled series/case summaries. (montfrans2012cd27deficiencyis pages 2-4, alkhairy2015novelmutationsin pages 4-5, kishore2020novelmutationin pages 4-5) van Montfrans 2012, J Allergy Clin Immunol, https://doi.org/10.1016/j.jaci.2011.11.013; Alkhairy 2015, J Allergy Clin Immunol, https://doi.org/10.1016/j.jaci.2015.02.022 (montfrans2012cd27deficiencyis pages 2-4, alkhairy2015novelmutationsin pages 1-2)
c.G158A, p.C53Y Missense Homozygous AR in 3 independent families (8 patients total in Salzer cohort) Phenotypic range from asymptomatic memory B-cell deficiency to EBV-associated hemophagocytosis/HLH, lymphoproliferative disorder, and malignant lymphoma; after EBV infection, hypogammaglobulinemia developed in at least 3 affected individuals; reduced iNKT cells and impaired NK function in severe cases. (salzer2013combinedimmunodeficiencywith pages 1-2, alkhairy2015novelmutationsin pages 1-2) Two of 8 patients died; two underwent allogeneic HSCT successfully; one received repeated anti-CD20 (rituximab) therapy. (salzer2013combinedimmunodeficiencywith pages 1-2) Salzer 2013, Haematologica, https://doi.org/10.3324/haematol.2012.068791; Alkhairy 2015, J Allergy Clin Immunol, https://doi.org/10.1016/j.jaci.2015.02.022 (salzer2013combinedimmunodeficiencywith pages 1-2, alkhairy2015novelmutationsin pages 1-2)
c.C30A, p.C10X Nonsense / truncating Reported in pooled CD27-deficient cohort; zygosity not specified in excerpt Listed among pathogenic CD27 variants in patients with EBV viremia / EBV-related LPD / HLH / lymphoma and hypogammaglobulinemia spectrum. (kishore2020novelmutationin pages 4-5, alkhairy2015novelmutationsin pages 4-5) Included in cohorts where rituximab often produced favorable but sometimes transient responses and HSCT was curative in selected severe cases; variant-specific outcome not isolated in excerpt. (alkhairy2015novelmutationsin pages 4-5, kishore2020novelmutationin pages 4-5) Alkhairy 2015, J Allergy Clin Immunol, https://doi.org/10.1016/j.jaci.2015.02.022; Kishore 2020, BMJ Case Rep, https://doi.org/10.1136/bcr-2019-233482 (alkhairy2015novelmutationsin pages 4-5, kishore2020novelmutationin pages 4-5)
c.C232T, p.R78W Missense Reported in pooled cohort; zygosity not specified in excerpt In silico prediction damaging; associated within pooled CD27-deficiency series with EBV viremia/LPD, lymphoma, HLH, and antibody deficiency spectrum. (alkhairy2015novelmutationsin pages 5-6, kishore2020novelmutationin pages 4-5) Variant-specific treatment not isolated; pooled cohort treatments included IVIG, rituximab, chemotherapy, and HSCT. (alkhairy2015novelmutationsin pages 5-6, kishore2020novelmutationin pages 4-5) Alkhairy 2015, J Allergy Clin Immunol, https://doi.org/10.1016/j.jaci.2015.02.022; Kishore 2020, BMJ Case Rep, https://doi.org/10.1136/bcr-2019-233482 (alkhairy2015novelmutationsin pages 5-6, kishore2020novelmutationin pages 4-5)
c.G287A, p.C96Y Missense Reported in pooled cohort; zygosity not specified in excerpt In silico prediction damaging; reported among pathogenic variants in CD27 deficiency with EBV-related disease, including chronic/persistent EBV viremia, LPD, lymphoma, and hypogammaglobulinemia. (alkhairy2015novelmutationsin pages 5-6, kishore2020novelmutationin pages 4-5) Variant-specific treatment not isolated; pooled treatment experience includes IVIG, rituximab, conventional chemotherapy, and HSCT. (alkhairy2015novelmutationsin pages 4-5, kishore2020novelmutationin pages 4-5) Alkhairy 2015, J Allergy Clin Immunol, https://doi.org/10.1016/j.jaci.2015.02.022; Kishore 2020, BMJ Case Rep, https://doi.org/10.1136/bcr-2019-233482 (alkhairy2015novelmutationsin pages 5-6, kishore2020novelmutationin pages 4-5)
c.C319T, p.R107C Missense Reported in pooled cohort; one report notes structural misfolding prediction; zygosity not specified in excerpt Associated with EBV viremia / EBV-related extranodal LPD / Hodgkin or diffuse large B-cell lymphoma / HLH spectrum in pooled cases; impaired CD27 expression and high EBV loads reported across affected cohort. (alkhairy2015novelmutationsin pages 5-6, kishore2020novelmutationin pages 4-5) Variant-specific response not isolated; pooled cohort notes rituximab can be favorable but transient, chemotherapy responses variable, and HSCT successful in selected cases. (alkhairy2015novelmutationsin pages 4-5, alkhairy2015novelmutationsin pages 7-9) Alkhairy 2015, J Allergy Clin Immunol, https://doi.org/10.1016/j.jaci.2015.02.022; Kishore 2020, BMJ Case Rep, https://doi.org/10.1136/bcr-2019-233482 (alkhairy2015novelmutationsin pages 5-6, kishore2020novelmutationin pages 4-5)
c.G329A, p.W110X Nonsense / truncating Reported in pooled case summary; zygosity not specified in excerpt Listed among CD27 pathogenic variants in patients with recurrent infections, hypogammaglobulinemia/CVID-like disease, persistent lymphadenopathy/hepatosplenomegaly, high EBV titers, EBV-driven LPD, HLH, and lymphoma. (kishore2020novelmutationin pages 4-5, izawa2017inheritedcd70deficiency pages 10-11) Variant-specific treatment not isolated; broader cohort experience supports rituximab for EBV-driven B-cell disease and HSCT as definitive therapy in severe disease. (kishore2020novelmutationin pages 4-5, tangye2020primaryimmunodeficienciesreveal pages 7-8) Kishore 2020, BMJ Case Rep, https://doi.org/10.1136/bcr-2019-233482; Izawa 2017 mechanistic comparison, J Exp Med, https://doi.org/10.1084/jem.20160784 (kishore2020novelmutationin pages 4-5, izawa2017inheritedcd70deficiency pages 10-11)
Homozygous CD27 variant (not specified in excerpt) Not specified in excerpt Homozygous AR 20-month-old boy with CD27 deficiency; EBV-associated lymphoma (EBER-positive), dysgammaglobulinemia / impaired antibody responses in disease background, coronary artery ectasia / aneurysm, and later SARS-CoV-2 infection; authors note >35 CD27-deficient patients reported. (golchehre2023newpresentationof pages 1-2, golchehre2023newpresentationof pages 2-4) Treated with IVIG and aspirin for Kawasaki-like/coronary presentation; lymphoma treated with ABVD and COPP; coronary aneurysm size decreased with aspirin/Plavix; short-term survival reported. (golchehre2023newpresentationof pages 2-4) Golchehre 2023, Iran J Allergy Asthma Immunol, https://doi.org/10.18502/ijaai.v22i1.12013 (golchehre2023newpresentationof pages 1-2, golchehre2023newpresentationof pages 2-4)
Multiple biallelic CD27 variants (16 distinct mutations across cohort) Mixed: nonsense, missense, other LOF Predominantly homozygous / biallelic AR; some compound heterozygous In the largest multicenter cohort of CD27/CD70 defects, 90% were EBV-positive at diagnosis; lymphoproliferation 70%; lymphoma 43%; 9 CD27-deficient patients developed HLH; autoinflammatory features in 43%; aberrant memory B/T-cell generation and paucity of EBV-specific T cells. (ghosh2020extendedclinicaland pages 2-3) 19 patients underwent allogeneic HSCT with 95% overall survival and no disease recurrence reported; timely HSCT advocated, especially for malignant transformation. (ghosh2020extendedclinicaland pages 2-3, ghosh2020extendedclinicaland pages 3-4) Ghosh 2020, Blood (cohort summarized in retrieved evidence), DOI noted in excerpt as 10.1182/blood.2020006738 (ghosh2020extendedclinicaland pages 2-3, ghosh2020extendedclinicaland pages 3-4)
Mixed CD27 cohort variants including c.24G>A/p.W8X, c.G158A/p.C53Y, c.C30A/p.C10X, c.C232T/p.R78W, c.G287A/p.C96Y, c.C319T/p.R107C Mixed Mixed biallelic AR; many from consanguineous families 17-patient cohort: EBV disease prominent; high EBV plasma loads in 11/12 tested, up to ~5×10^6–8×10^6 copies/mL; DLBCL, extranodal EBV-related LPD, classical Hodgkin lymphoma, HLH, and hypogammaglobulinemia/secondary HGG all reported; mortality 29%. (alkhairy2015novelmutationsin pages 5-6, alkhairy2015novelmutationsin pages 7-9, alkhairy2015novelmutationsin pages 4-5) Rituximab used in 6/17 with favorable sometimes transient response; conventional chemotherapy responses variable; 3/17 underwent cord blood HSCT and were alive. (alkhairy2015novelmutationsin pages 4-5, alkhairy2015novelmutationsin pages 7-9) Alkhairy 2015, J Allergy Clin Immunol, https://doi.org/10.1016/j.jaci.2015.02.022 (alkhairy2015novelmutationsin pages 4-5, alkhairy2015novelmutationsin pages 5-6, alkhairy2015novelmutationsin pages 7-9)

Table: This table compiles reported pathogenic CD27 (TNFRSF7) variants from the retrieved evidence and links each variant to the clinical phenotype spectrum, EBV-related manifestations, and available treatment/outcome data. It is useful for quickly mapping genotype to phenotype and identifying where variant-specific versus cohort-level evidence is currently available.

4.3 Functional consequence

The consistent mechanistic interpretation is loss of CD27 function (reduced/absent CD27 expression and/or impaired CD70 binding/costimulation), leading to defective EBV-specific T-cell expansion and impaired post-germinal-center B-cell responses. (montfrans2012cd27deficiencyis pages 8-10, tangye2020primaryimmunodeficienciesreveal pages 7-8, izawa2017inheritedcd70deficiency pages 1-2)

4.4 Modifier genes / epigenetics / chromosomal abnormalities

No specific modifier genes, epigenetic signatures, or recurrent chromosomal abnormalities were identified in the retrieved evidence.


5. Environmental Information

The key environmental/infectious factor is EBV as a trigger for disease expression and progression to LPD/HLH/lymphoma. (ghosh2020extendedclinicaland pages 2-3, salzer2013combinedimmunodeficiencywith pages 1-2)

A 2023 report noted concomitant SARS-CoV-2 infection in an infant with CD27 deficiency, but causal contribution to the phenotype remains uncertain. (golchehre2023newpresentationof pages 1-2)


6. Mechanism / Pathophysiology

6.1 Core molecular mechanism (CD27–CD70 costimulation)

CD27 is a TNFR superfamily costimulatory receptor expressed on multiple immune subsets, and its ligand CD70 is induced on activated and EBV-infected B cells. CD27–CD70 engagement provides costimulation that enhances T-cell activation, survival, proliferation, and differentiation, which is required for effective anti-EBV immunity. (tangye2020primaryimmunodeficienciesreveal pages 7-8, izawa2017inheritedcd70deficiency pages 1-2, ghosh2020extendedclinicaland pages 2-3)

Direct abstract-supported statement (example): Salzer et al. reported: “CD27… interacts with CD70 and influences T-, B- and NK-cell functions. Disturbance of this axis impairs immunity and memory generation against viruses including Epstein Barr virus (EBV).” (salzer2013combinedimmunodeficiencywith pages 1-2)

6.2 Causal chain (from genotype to clinical manifestations)

  1. Biallelic CD27 LOF → absent/reduced CD27 signaling. (montfrans2012cd27deficiencyis pages 2-4, alkhairy2015novelmutationsin pages 7-9)
  2. Activated/EBV-infected B cells upregulate CD70, but cannot deliver effective CD70→CD27 costimulation to T cells. (tangye2020primaryimmunodeficienciesreveal pages 7-8, izawa2017inheritedcd70deficiency pages 1-2)
  3. Impaired EBV-specific T-cell expansion/effector function → failure of EBV control → chronic EBV viremia and EBV-driven lymphoproliferation and lymphoma. (ghosh2020extendedclinicaland pages 2-3, tangye2020primaryimmunodeficienciesreveal pages 7-8)
  4. Parallel humoral defects (post-germinal-center/plasma-cell biology and memory generation abnormalities) contribute to hypogammaglobulinemia and recurrent infections. (montfrans2012cd27deficiencyis pages 8-10, ghosh2020extendedclinicaland pages 2-3)

6.3 Cell types involved (Cell Ontology suggestions)

  • CD8+ T cells (CL:0000625): EBV-specific cytotoxic responses impaired. (ghosh2020extendedclinicaland pages 2-3, tangye2020primaryimmunodeficienciesreveal pages 7-8)
  • B cells (CL:0000236), especially memory B cells (CL:0000787) and plasma cells (CL:0000786): memory/plasma cell abnormalities and hypogammaglobulinemia. (montfrans2012cd27deficiencyis pages 8-10, alkhairy2015novelmutationsin pages 7-9)
  • Natural killer (NK) cells (CL:0000623) and invariant NKT cells (CL:0000814): reduced function/numbers in subsets of severe patients. (alkhairy2015novelmutationsin pages 7-9, salzer2013combinedimmunodeficiencywith pages 1-2)

6.4 Pathway / ontology mapping suggestions

  • GO:0002429 immune response-activating cell surface receptor signaling pathway
  • GO:0031295 T cell costimulation
  • GO:0042110 T cell activation
  • GO:0002250 adaptive immune response
  • GO:0045321 leukocyte activation

(These GO mappings are consistent with costimulatory receptor biology described in primary texts but were not enumerated as GO terms in the retrieved papers.)


7. Anatomical Structures Affected

Primary systems/organs: - Lymphoid system: lymph nodes (lymphadenopathy/LPD), spleen and liver (hepatosplenomegaly). Suggested UBERON: lymph node (UBERON:0000029), spleen (UBERON:0002106), liver (UBERON:0002107). (montfrans2012cd27deficiencyis pages 2-4, ghosh2020extendedclinicaland pages 2-3) - Respiratory system: recurrent airway infections and bronchiectasis. Suggested UBERON: lung (UBERON:0002048), bronchus (UBERON:0002185). (kishore2020novelmutationin pages 2-3) - Eye: uveitis in EBV context. Suggested UBERON: uvea (UBERON:0001769). (montfrans2012cd27deficiencyis pages 2-4) - Cardiovascular system (recent report): coronary artery ectasia/aneurysm. Suggested UBERON: coronary artery (UBERON:0001621). (golchehre2023newpresentationof pages 2-4)


8. Temporal Development

Onset: typically childhood (mean age of disease manifestation ~7.3 years in one multicenter cohort). (ghosh2020extendedclinicaland pages 3-4)

Course: variable; patients may be asymptomatic early, or develop progressive EBV viremia leading to LPD/HLH/lymphoma; autoinflammatory features may occur. (ghosh2020extendedclinicaland pages 2-3, salzer2013combinedimmunodeficiencywith pages 1-2)


9. Inheritance and Population

9.1 Epidemiology

No robust population-level prevalence/incidence estimates were identified in the retrieved evidence. The disease is described via rare-case aggregation, with authors noting “more than 35 patients” reported as of 2023. (golchehre2023newpresentationof pages 1-2)

9.2 Population genetics and counseling-relevant points

  • Autosomal recessive inheritance, often with consanguinity reported in cohorts. (alkhairy2015novelmutationsin pages 1-2)
  • High penetrance of EBV-related disease features at cohort level: EBV positivity at diagnosis ~90% in a large cohort. (ghosh2020extendedclinicaland pages 2-3)
  • Variant spectrum: multiple distinct mutations across cohorts, including recurrent truncating and missense variants. (alkhairy2015novelmutationsin pages 4-5, ghosh2020extendedclinicaland pages 2-3)

Carrier frequencies and founder effects were not extractable from the obtained texts (gnomAD and population-genetic databases were not queried by tools in this run).


10. Diagnostics

10.1 Clinical and laboratory tests

  • Flow cytometry screening: CD27 expression on lymphocytes can be used as a screening test. (kishore2020novelmutationin pages 4-5, salzer2013combinedimmunodeficiencywith pages 1-2)
  • Humoral immunity: serum immunoglobulins and specific antibody responses (including protein antigen responses) are informative; CD27 deficiency can present as CVID-like hypogammaglobulinemia with impaired T-dependent antibody responses. (montfrans2012cd27deficiencyis pages 6-7, alkhairy2015novelmutationsin pages 4-5)
  • EBV testing: plasma EBV PCR/viral load monitoring, EBV serology, and detection of EBV in purified B-cell fractions were used in diagnostic workups. (montfrans2012cd27deficiencyis pages 2-4)
  • Tissue pathology: immunohistochemistry panels and EBV tissue detection (e.g., EBER by CISH in lymphoma tissue) were used in a 2023 case report. (golchehre2023newpresentationof pages 2-4)

10.2 Genetic testing

Approaches used in reported studies include: - Targeted Sanger sequencing of CD27 and related differential genes (e.g., SH2D1A, XIAP, PRF1 in one report). (montfrans2012cd27deficiencyis pages 2-4) - Whole-exome sequencing with confirmatory Sanger sequencing and family segregation. (salzer2013combinedimmunodeficiencywith pages 1-2, alkhairy2015novelmutationsin pages 1-2)

10.3 Differential diagnosis (examples from retrieved evidence)

  • CVID and CVID-like antibody deficiency. (kishore2020novelmutationin pages 4-5, salzer2013combinedimmunodeficiencywith pages 1-2)
  • ALPS and lymphoproliferation/autoimmune cytopenia syndromes. (kishore2020novelmutationin pages 4-5)
  • EBV-susceptibility IEIs: XLP1 (SH2D1A), XLP2 (XIAP), ITK, MAGT1, CTPS1, CD70, and others. (kishore2020novelmutationin pages 1-2, salzer2013combinedimmunodeficiencywith pages 1-2)

11. Outcome / Prognosis

  • Disease severity is variable, ranging from asymptomatic immune subset abnormalities to life-threatening EBV-LPD/HLH and lymphoma. (salzer2013combinedimmunodeficiencywith pages 1-2)
  • Reported mortality in a 17-patient cohort was 29%. (alkhairy2015novelmutationsin pages 7-9)
  • Mortality in a larger multicenter cohort included 6/33 CD27-deficient deaths (within 49 total), attributed to lymphoproliferation/lymphoma and infections. (ghosh2020extendedclinicaland pages 3-4)
  • HSCT appears associated with favorable outcomes in appropriately selected severe cases (see Treatment). (ghosh2020extendedclinicaland pages 3-4)

12. Treatment (current applications / real-world implementation)

12.1 Supportive care

  • Immunoglobulin replacement (IgRT/IVIG): hypogammaglobulinemia detected in 18/49 and IgG substitution given to 18/49 in a multicenter cohort. (ghosh2020extendedclinicaland pages 8-8)
  • Antibiotic prophylaxis: provided in 17/49 in that same cohort. (ghosh2020extendedclinicaland pages 8-8)

12.2 EBV-driven lymphoproliferation: B-cell–directed therapy

  • Rituximab (anti-CD20): used in 6/17 in one cohort; reported to yield favorable (sometimes transient) responses in EBV-related LPD/HLH/lymphoma contexts. (alkhairy2015novelmutationsin pages 4-5)

12.3 Hyperinflammation / HLH

  • HLH-2004/HLH-1994 protocols were used in cohort practice; HLH-2004 was also explicitly referenced in a CD27 cohort. (ghosh2020extendedclinicaland pages 8-8, alkhairy2015novelmutationsin pages 4-5)

12.4 Lymphoma therapy

  • Treated using disease-specific protocols; regimens cited include ABVD/R-ABVD and CHOP-based approaches in multicenter summaries. (alkhairy2015novelmutationsin pages 4-5, ghosh2020extendedclinicaland pages 8-8)
  • In a 2023 case report, lymphoma was treated with ABVD and COPP, alongside cardiovascular-directed therapy for coronary disease. (golchehre2023newpresentationof pages 2-4)

12.5 Curative therapy: allogeneic HSCT

  • In the multicenter cohort, 20 allogeneic HSCT procedures were performed in 19 patients with 95% overall survival. (ghosh2020extendedclinicaland pages 3-4)
  • Within that cohort, 11/33 (33%) CD27-deficient patients underwent HSCT; major indications included persistent EBV viremia/LPD, lymphoma, and HLH combinations. (ghosh2020extendedclinicaland pages 8-8)

MAXO term suggestions (not exhaustive): hematopoietic stem cell transplantation; immunoglobulin replacement therapy; anti-CD20 monoclonal antibody therapy; antimicrobial prophylaxis; chemotherapy; HLH treatment protocol.

Clinical trials: No CD27-deficiency–specific interventional trials were identified via the clinical trials tool in this run.


13. Prevention

No disease-specific primary prevention strategies exist beyond genetic counseling and early diagnosis; however, practical risk reduction includes: - Early identification and monitoring for EBV DNAemia and lymphoproliferation. (montfrans2012cd27deficiencyis pages 2-4, ghosh2020extendedclinicaland pages 2-3) - Family testing/cascade screening in autosomal recessive pedigrees once a familial variant is known. (montfrans2012cd27deficiencyis pages 2-4)


14. Other Species / Natural Disease

No naturally occurring veterinary CD27-deficiency disease analogs were identified in the retrieved evidence.


15. Model Organisms and Experimental Systems

15.1 Mouse models

Mouse studies cited in human CD27-deficiency literature indicate that Cd27−/− impacts antiviral T-cell biology (e.g., impaired primary/memory CD4/CD8 responses and reduced IL-2–producing CD8 memory cells), supporting biological plausibility for human EBV susceptibility. (montfrans2012cd27deficiencyis pages 7-8, salzer2013combinedimmunodeficiencywith pages 1-2)

15.2 Human in vitro / ex vivo systems

  • EBV-transformed B-cell lines (LCLs) and patient T cells are used to demonstrate that CD70 on B cells and CD27 on T cells are required for robust T-cell proliferation/costimulation in EBV contexts; CRISPR-modified CD70-deficient LCLs and CD27-blocking antibodies were used in mechanistic experiments. (izawa2017inheritedcd70deficiency pages 10-11)
  • Patient-derived systems in early reports included EBV-specific T-cell assays and lysis of autologous EBV-transformed B cells, plus detailed immunophenotyping and functional B-cell differentiation assays. (montfrans2012cd27deficiencyis pages 6-7)

Notes on evidence gaps (limitations of this run)

  • MONDO, Orphanet, ICD-10/11, MeSH identifiers were not recovered from the obtained documents.
  • Population prevalence/incidence, carrier frequency estimates (gnomAD), and founder effects were not extracted.
  • No figures/tables could be retrieved via the image tool due to an extraction error for the key cohort paper.

References

  1. (ghosh2020extendedclinicaland pages 2-3): S Ghosh, SK Bal, and ES Edwards. Extended clinical and immunological phenot pe and transplant outcome in cd27 and cd70 deficienc.,(23), 2638-2655. doi: 10.1182/blood. 2020006738 …. Unknown journal, 2020.

  2. (tangye2020primaryimmunodeficienciesreveal pages 7-8): Stuart G. Tangye and Sylvain Latour. Primary immunodeficiencies reveal the molecular requirements for effective host defense against ebv infection. Blood, 135:644-655, Feb 2020. URL: https://doi.org/10.1182/blood.2019000928, doi:10.1182/blood.2019000928. This article has 128 citations and is from a highest quality peer-reviewed journal.

  3. (salzer2013combinedimmunodeficiencywith pages 1-2): E. Salzer, S. Daschkey, S. Choo, M. Gombert, E. Santos-Valente, S. Ginzel, M. Schwendinger, O. A. Haas, G. Fritsch, W. F. Pickl, E. Forster-Waldl, A. Borkhardt, K. Boztug, K. Bienemann, and M. G. Seidel. Combined immunodeficiency with life-threatening ebv-associated lymphoproliferative disorder in patients lacking functional cd27. Haematologica, 98:473-478, Mar 2013. URL: https://doi.org/10.3324/haematol.2012.068791, doi:10.3324/haematol.2012.068791. This article has 200 citations.

  4. (golchehre2023newpresentationof pages 1-2): Zahra Golchehre, Samin Sharafian, Nader Momtazmanesh, Zahra Chavoshzadeh, Abdollah Karimi, Hassan Abolhassani, Maryam Kazemi Aghdam, Koroush Vahidshahi, Seyedehatefeh Hashemimoghaddam, Farid Kosari, Zahra Khafafpour, Bibi Shahin Shamsian, and Mohammad Keramatipour. New presentation of cd27 deficiency; coronary ectasia and covid-19. Iranian Journal of Allergy, Asthma and Immunology, Feb 2023. URL: https://doi.org/10.18502/ijaai.v22i1.12013, doi:10.18502/ijaai.v22i1.12013. This article has 7 citations.

  5. (alkhairy2015novelmutationsin pages 1-2): Omar K. Alkhairy, Ruy Perez-Becker, Gertjan J. Driessen, Hassan Abolhassani, Joris van Montfrans, Stephan Borte, Sharon Choo, Ning Wang, Kiki Tesselaar, Mingyan Fang, Kirsten Bienemann, Kaan Boztug, Ana Daneva, Francoise Mechinaud, Thomas Wiesel, Christian Becker, Gregor Dückers, Kathrin Siepermann, Menno C. van Zelm, Nima Rezaei, Mirjam van der Burg, Asghar Aghamohammadi, Markus G. Seidel, Tim Niehues, and Lennart Hammarström. Novel mutations in tnfrsf7/cd27: clinical, immunologic, and genetic characterization of human cd27 deficiency. The Journal of allergy and clinical immunology, 136 3:703-712.e10, Sep 2015. URL: https://doi.org/10.1016/j.jaci.2015.02.022, doi:10.1016/j.jaci.2015.02.022. This article has 160 citations.

  6. (kishore2020novelmutationin pages 2-3): Rashmi Kishore, Aditya Gupta, Aditya Kumar Gupta, and Sushil Kumar Kabra. Novel mutation in the cd27 gene in a patient presenting with hypogammaglobulinemia, bronchiectasis and ebv-driven lymphoproliferative disease. BMJ Case Reports, 13:e233482, Feb 2020. URL: https://doi.org/10.1136/bcr-2019-233482, doi:10.1136/bcr-2019-233482. This article has 8 citations and is from a peer-reviewed journal.

  7. (alkhairy2015novelmutationsin pages 4-5): Omar K. Alkhairy, Ruy Perez-Becker, Gertjan J. Driessen, Hassan Abolhassani, Joris van Montfrans, Stephan Borte, Sharon Choo, Ning Wang, Kiki Tesselaar, Mingyan Fang, Kirsten Bienemann, Kaan Boztug, Ana Daneva, Francoise Mechinaud, Thomas Wiesel, Christian Becker, Gregor Dückers, Kathrin Siepermann, Menno C. van Zelm, Nima Rezaei, Mirjam van der Burg, Asghar Aghamohammadi, Markus G. Seidel, Tim Niehues, and Lennart Hammarström. Novel mutations in tnfrsf7/cd27: clinical, immunologic, and genetic characterization of human cd27 deficiency. The Journal of allergy and clinical immunology, 136 3:703-712.e10, Sep 2015. URL: https://doi.org/10.1016/j.jaci.2015.02.022, doi:10.1016/j.jaci.2015.02.022. This article has 160 citations.

  8. (montfrans2012cd27deficiencyis pages 2-4): Joris M. van Montfrans, Andy I.M. Hoepelman, Sigrid Otto, Marielle van Gijn, Lisette van de Corput, Roel A. de Weger, Linda Monaco-Shawver, Pinaki P. Banerjee, Elisabeth A.M. Sanders, Cornelia M. Jol–van der Zijde, Michael R. Betts, Jordan S. Orange, Andries C. Bloem, and Kiki Tesselaar. Cd27 deficiency is associated with combined immunodeficiency and persistent symptomatic ebv viremia. The Journal of allergy and clinical immunology, 129 3:787-793.e6, Mar 2012. URL: https://doi.org/10.1016/j.jaci.2011.11.013, doi:10.1016/j.jaci.2011.11.013. This article has 259 citations.

  9. (alkhairy2015novelmutationsin pages 7-9): Omar K. Alkhairy, Ruy Perez-Becker, Gertjan J. Driessen, Hassan Abolhassani, Joris van Montfrans, Stephan Borte, Sharon Choo, Ning Wang, Kiki Tesselaar, Mingyan Fang, Kirsten Bienemann, Kaan Boztug, Ana Daneva, Francoise Mechinaud, Thomas Wiesel, Christian Becker, Gregor Dückers, Kathrin Siepermann, Menno C. van Zelm, Nima Rezaei, Mirjam van der Burg, Asghar Aghamohammadi, Markus G. Seidel, Tim Niehues, and Lennart Hammarström. Novel mutations in tnfrsf7/cd27: clinical, immunologic, and genetic characterization of human cd27 deficiency. The Journal of allergy and clinical immunology, 136 3:703-712.e10, Sep 2015. URL: https://doi.org/10.1016/j.jaci.2015.02.022, doi:10.1016/j.jaci.2015.02.022. This article has 160 citations.

  10. (alkhairy2015novelmutationsin pages 5-6): Omar K. Alkhairy, Ruy Perez-Becker, Gertjan J. Driessen, Hassan Abolhassani, Joris van Montfrans, Stephan Borte, Sharon Choo, Ning Wang, Kiki Tesselaar, Mingyan Fang, Kirsten Bienemann, Kaan Boztug, Ana Daneva, Francoise Mechinaud, Thomas Wiesel, Christian Becker, Gregor Dückers, Kathrin Siepermann, Menno C. van Zelm, Nima Rezaei, Mirjam van der Burg, Asghar Aghamohammadi, Markus G. Seidel, Tim Niehues, and Lennart Hammarström. Novel mutations in tnfrsf7/cd27: clinical, immunologic, and genetic characterization of human cd27 deficiency. The Journal of allergy and clinical immunology, 136 3:703-712.e10, Sep 2015. URL: https://doi.org/10.1016/j.jaci.2015.02.022, doi:10.1016/j.jaci.2015.02.022. This article has 160 citations.

  11. (kishore2020novelmutationin pages 4-5): Rashmi Kishore, Aditya Gupta, Aditya Kumar Gupta, and Sushil Kumar Kabra. Novel mutation in the cd27 gene in a patient presenting with hypogammaglobulinemia, bronchiectasis and ebv-driven lymphoproliferative disease. BMJ Case Reports, 13:e233482, Feb 2020. URL: https://doi.org/10.1136/bcr-2019-233482, doi:10.1136/bcr-2019-233482. This article has 8 citations and is from a peer-reviewed journal.

  12. (montfrans2012cd27deficiencyis pages 6-7): Joris M. van Montfrans, Andy I.M. Hoepelman, Sigrid Otto, Marielle van Gijn, Lisette van de Corput, Roel A. de Weger, Linda Monaco-Shawver, Pinaki P. Banerjee, Elisabeth A.M. Sanders, Cornelia M. Jol–van der Zijde, Michael R. Betts, Jordan S. Orange, Andries C. Bloem, and Kiki Tesselaar. Cd27 deficiency is associated with combined immunodeficiency and persistent symptomatic ebv viremia. The Journal of allergy and clinical immunology, 129 3:787-793.e6, Mar 2012. URL: https://doi.org/10.1016/j.jaci.2011.11.013, doi:10.1016/j.jaci.2011.11.013. This article has 259 citations.

  13. (golchehre2023newpresentationof pages 2-4): Zahra Golchehre, Samin Sharafian, Nader Momtazmanesh, Zahra Chavoshzadeh, Abdollah Karimi, Hassan Abolhassani, Maryam Kazemi Aghdam, Koroush Vahidshahi, Seyedehatefeh Hashemimoghaddam, Farid Kosari, Zahra Khafafpour, Bibi Shahin Shamsian, and Mohammad Keramatipour. New presentation of cd27 deficiency; coronary ectasia and covid-19. Iranian Journal of Allergy, Asthma and Immunology, Feb 2023. URL: https://doi.org/10.18502/ijaai.v22i1.12013, doi:10.18502/ijaai.v22i1.12013. This article has 7 citations.

  14. (izawa2017inheritedcd70deficiency pages 10-11): Kazushi Izawa, Emmanuel Martin, Claire Soudais, Julie Bruneau, David Boutboul, Rémy Rodriguez, Christelle Lenoir, Andrew D. Hislop, Caroline Besson, Fabien Touzot, Capucine Picard, Isabelle Callebaut, Jean-Pierre de Villartay, Despina Moshous, Alain Fischer, and Sylvain Latour. Inherited cd70 deficiency in humans reveals a critical role for the cd70–cd27 pathway in immunity to epstein-barr virus infection. The Journal of Experimental Medicine, 214:73-89, Jan 2017. URL: https://doi.org/10.1084/jem.20160784, doi:10.1084/jem.20160784. This article has 181 citations.

  15. (ghosh2020extendedclinicaland pages 3-4): S Ghosh, SK Bal, and ES Edwards. Extended clinical and immunological phenot pe and transplant outcome in cd27 and cd70 deficienc.,(23), 2638-2655. doi: 10.1182/blood. 2020006738 …. Unknown journal, 2020.

  16. (montfrans2012cd27deficiencyis pages 8-10): Joris M. van Montfrans, Andy I.M. Hoepelman, Sigrid Otto, Marielle van Gijn, Lisette van de Corput, Roel A. de Weger, Linda Monaco-Shawver, Pinaki P. Banerjee, Elisabeth A.M. Sanders, Cornelia M. Jol–van der Zijde, Michael R. Betts, Jordan S. Orange, Andries C. Bloem, and Kiki Tesselaar. Cd27 deficiency is associated with combined immunodeficiency and persistent symptomatic ebv viremia. The Journal of allergy and clinical immunology, 129 3:787-793.e6, Mar 2012. URL: https://doi.org/10.1016/j.jaci.2011.11.013, doi:10.1016/j.jaci.2011.11.013. This article has 259 citations.

  17. (izawa2017inheritedcd70deficiency pages 1-2): Kazushi Izawa, Emmanuel Martin, Claire Soudais, Julie Bruneau, David Boutboul, Rémy Rodriguez, Christelle Lenoir, Andrew D. Hislop, Caroline Besson, Fabien Touzot, Capucine Picard, Isabelle Callebaut, Jean-Pierre de Villartay, Despina Moshous, Alain Fischer, and Sylvain Latour. Inherited cd70 deficiency in humans reveals a critical role for the cd70–cd27 pathway in immunity to epstein-barr virus infection. The Journal of Experimental Medicine, 214:73-89, Jan 2017. URL: https://doi.org/10.1084/jem.20160784, doi:10.1084/jem.20160784. This article has 181 citations.

  18. (kishore2020novelmutationin pages 1-2): Rashmi Kishore, Aditya Gupta, Aditya Kumar Gupta, and Sushil Kumar Kabra. Novel mutation in the cd27 gene in a patient presenting with hypogammaglobulinemia, bronchiectasis and ebv-driven lymphoproliferative disease. BMJ Case Reports, 13:e233482, Feb 2020. URL: https://doi.org/10.1136/bcr-2019-233482, doi:10.1136/bcr-2019-233482. This article has 8 citations and is from a peer-reviewed journal.

  19. (ghosh2020extendedclinicaland pages 8-8): S Ghosh, SK Bal, and ES Edwards. Extended clinical and immunological phenot pe and transplant outcome in cd27 and cd70 deficienc.,(23), 2638-2655. doi: 10.1182/blood. 2020006738 …. Unknown journal, 2020.

  20. (montfrans2012cd27deficiencyis pages 7-8): Joris M. van Montfrans, Andy I.M. Hoepelman, Sigrid Otto, Marielle van Gijn, Lisette van de Corput, Roel A. de Weger, Linda Monaco-Shawver, Pinaki P. Banerjee, Elisabeth A.M. Sanders, Cornelia M. Jol–van der Zijde, Michael R. Betts, Jordan S. Orange, Andries C. Bloem, and Kiki Tesselaar. Cd27 deficiency is associated with combined immunodeficiency and persistent symptomatic ebv viremia. The Journal of allergy and clinical immunology, 129 3:787-793.e6, Mar 2012. URL: https://doi.org/10.1016/j.jaci.2011.11.013, doi:10.1016/j.jaci.2011.11.013. This article has 259 citations.