Schinzel-Giedion syndrome is a severe autosomal dominant multisystem developmental disorder caused by de novo missense variants in the degron region of SETBP1. These variants impair normal SETBP1 protein degradation, leading to toxic accumulation of an epigenetic transcriptional regulator. Dysregulated SETBP1 activity rewires developmental gene-expression programs, impairs neurogenesis and neuronal migration, and underlies the syndrome's severe developmental delay, progressive brain disease, seizures, craniofacial abnormalities, and visceral malformations.
Conditions with similar clinical presentations that must be differentiated from Schinzel-Giedion syndrome:
name: Schinzel-Giedion syndrome
creation_date: '2026-04-11T19:38:25Z'
updated_date: '2026-04-12T00:18:00Z'
category: Mendelian
description: >-
Schinzel-Giedion syndrome is a severe autosomal dominant multisystem
developmental disorder caused by de novo missense variants in the degron
region of SETBP1. These variants impair normal SETBP1 protein degradation,
leading to toxic accumulation of an epigenetic transcriptional regulator.
Dysregulated SETBP1 activity rewires developmental gene-expression programs,
impairs neurogenesis and neuronal migration, and underlies the syndrome's
severe developmental delay, progressive brain disease, seizures, craniofacial
abnormalities, and visceral malformations.
disease_term:
preferred_term: Schinzel-Giedion syndrome
term:
id: MONDO:0010010
label: Schinzel-Giedion syndrome
mappings:
mondo_mappings:
- term:
id: MONDO:0010010
label: Schinzel-Giedion syndrome
mapping_predicate: skos:exactMatch
mapping_source: MONDO
parents:
- hereditary disease
- developmental disorder
inheritance:
- name: Autosomal dominant inheritance
inheritance_term:
preferred_term: Autosomal dominant inheritance
term:
id: HP:0000006
label: Autosomal dominant inheritance
description: >-
Schinzel-Giedion syndrome is typically caused by spontaneous de novo SETBP1
variants.
evidence:
- reference: PMID:38452171
reference_title: Schinzel-Giedion Syndrome.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Classic and atypical SGS are autosomal dominant disorders typically caused by a de novo SETBP1 pathogenic variant.
explanation: >-
GeneReviews directly supports dominant inheritance with typically de novo
SETBP1 pathogenic variants.
pathophysiology:
- name: Impaired SETBP1 degron-dependent degradation
description: >-
Classical Schinzel-Giedion syndrome is caused by degron-region SETBP1
variants that disrupt normal protein degradation and produce toxic
accumulation.
genes:
- preferred_term: SETBP1
term:
id: hgnc:15573
label: SETBP1
evidence:
- reference: PMID:37872881
reference_title: "Cell-type-specific gene expression and regulation in the cerebral cortex and kidney of atypical Setbp1(S858R) Schinzel Giedion Syndrome mice."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: >-
SETBP1 variants causing classical SGS cluster at the degron, disrupting SETBP1 protein degradation and resulting in toxic accumulation, while those located outside cause milder atypical SGS.
explanation: >-
This sentence directly states the core degron-disruption mechanism of
classical SGS.
downstream:
- target: Aberrant developmental gene transcription
description: Excess SETBP1 alters transcriptional control over developmental programs
- name: Aberrant developmental gene transcription
description: >-
SETBP1 acts as an epigenetic hub at AT-rich promoter regions to activate
developmental genes, and pathogenic variants dysregulate this transcriptional
program.
biological_processes:
- preferred_term: regulation of transcription by RNA polymerase II
modifier: ABNORMAL
term:
id: GO:0006357
label: regulation of transcription by RNA polymerase II
evidence:
- reference: PMID:29875417
reference_title: "SETBP1 induces transcription of a network of development genes by acting as an epigenetic hub."
supports: SUPPORT
evidence_source: IN_VITRO
snippet: >-
Here we show that SETBP1 binds to gDNA in AT-rich promoter regions, causing activation of gene expression through recruitment of a HCF1/KMT2A/PHF8 epigenetic complex.
explanation: >-
This directly supports SETBP1 as a transcriptional and epigenetic regulator.
- reference: PMID:29875417
reference_title: "SETBP1 induces transcription of a network of development genes by acting as an epigenetic hub."
supports: SUPPORT
evidence_source: IN_VITRO
snippet: >-
Gene ontology analysis of deregulated SETBP1 target genes indicates that they are also key controllers of visceral organ development and brain morphogenesis.
explanation: >-
This links dysregulated SETBP1 targets to the organ-development phenotype
of SGS.
downstream:
- target: Impaired neurogenesis and neuronal migration
description: Dysregulated SETBP1 activity disrupts brain development
- name: Impaired neurogenesis and neuronal migration
description: >-
Pathogenic SETBP1 activity disrupts neurogenesis, neuronal migration, and
cell-type-specific regulatory programs in the brain.
biological_processes:
- preferred_term: neuron differentiation
modifier: ABNORMAL
term:
id: GO:0030182
label: neuron differentiation
evidence:
- reference: PMID:29875417
reference_title: "SETBP1 induces transcription of a network of development genes by acting as an epigenetic hub."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: >-
In line with these findings, in utero brain electroporation of mutated SETBP1 causes impairment of mouse neurogenesis with a profound delay in neuronal migration.
explanation: >-
This directly supports a causal neurodevelopmental mechanism downstream of
mutant SETBP1.
downstream:
- target: Severe neurodevelopmental impairment
description: Impaired neurogenesis leads to profound developmental and cognitive disability
- target: Refractory epilepsy
description: Altered brain development contributes to the syndrome's severe seizure phenotype
- name: Severe neurodevelopmental impairment
description: >-
Downstream consequences of dysregulated SETBP1 activity include severe global
developmental impairment and intellectual disability.
evidence:
- reference: PMID:38452171
reference_title: Schinzel-Giedion Syndrome.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Classic Schinzel-Giedion syndrome (SGS), an ultra-rare multisystem disorder caused by gain-of-function pathogenic variants in a SETBP1 mutational hot spot, is characterized by global neurodevelopmental impairment leading to moderate-to-profound intellectual disability, epilepsy (often refractory to treatment), hypotonia, spasticity, dysautonomia, hearing loss, and cerebral visual impairment.
explanation: >-
This directly links the disease mechanism to severe human neurodevelopmental
impairment.
- name: Refractory epilepsy
description: >-
Severe epilepsy is a major downstream neurologic consequence of Schinzel-
Giedion syndrome.
evidence:
- reference: PMID:38452171
reference_title: Schinzel-Giedion Syndrome.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Classic Schinzel-Giedion syndrome (SGS), an ultra-rare multisystem disorder caused by gain-of-function pathogenic variants in a SETBP1 mutational hot spot, is characterized by global neurodevelopmental impairment leading to moderate-to-profound intellectual disability, epilepsy (often refractory to treatment), hypotonia, spasticity, dysautonomia, hearing loss, and cerebral visual impairment.
explanation: >-
This directly supports refractory epilepsy as a major downstream clinical
outcome.
phenotypes:
- name: Developmental delay
category: Neurologic
description: >-
Severe developmental delay is one of the most recognizable features of
Schinzel-Giedion syndrome.
phenotype_term:
preferred_term: Global developmental delay
term:
id: HP:0001263
label: Global developmental delay
evidence:
- reference: PMID:37872881
reference_title: "Cell-type-specific gene expression and regulation in the cerebral cortex and kidney of atypical Setbp1(S858R) Schinzel Giedion Syndrome mice."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: >-
The most notable phenotypes involve severe developmental delay, progressive brain atrophy, and drug-resistant seizures.
explanation: >-
This mouse-study abstract summarizes the hallmark phenotype background, but
is classified as model-organism evidence because of the underlying study
design.
- reference: PMID:38452171
reference_title: Schinzel-Giedion Syndrome.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Classic Schinzel-Giedion syndrome (SGS), an ultra-rare multisystem disorder caused by gain-of-function pathogenic variants in a SETBP1 mutational hot spot, is characterized by global neurodevelopmental impairment leading to moderate-to-profound intellectual disability, epilepsy (often refractory to treatment), hypotonia, spasticity, dysautonomia, hearing loss, and cerebral visual impairment.
explanation: >-
This provides direct human clinical support for severe developmental
impairment in SGS.
- name: Seizure
category: Neurologic
description: >-
Drug-resistant seizures are a prominent neurologic complication of
Schinzel-Giedion syndrome.
phenotype_term:
preferred_term: Seizure
term:
id: HP:0001250
label: Seizure
evidence:
- reference: PMID:37872881
reference_title: "Cell-type-specific gene expression and regulation in the cerebral cortex and kidney of atypical Setbp1(S858R) Schinzel Giedion Syndrome mice."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: >-
The most notable phenotypes involve severe developmental delay, progressive brain atrophy, and drug-resistant seizures.
explanation: >-
This mouse-study abstract summarizes the hallmark phenotype background, but
is classified as model-organism evidence because of the underlying study
design.
- reference: PMID:38452171
reference_title: Schinzel-Giedion Syndrome.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Classic Schinzel-Giedion syndrome (SGS), an ultra-rare multisystem disorder caused by gain-of-function pathogenic variants in a SETBP1 mutational hot spot, is characterized by global neurodevelopmental impairment leading to moderate-to-profound intellectual disability, epilepsy (often refractory to treatment), hypotonia, spasticity, dysautonomia, hearing loss, and cerebral visual impairment.
explanation: >-
This provides direct human clinical support for epilepsy in SGS.
- name: Intellectual disability
category: Neurologic
description: >-
Schinzel-Giedion syndrome is a severe neurodevelopmental disorder with major
cognitive impairment.
phenotype_term:
preferred_term: Intellectual disability
term:
id: HP:0001249
label: Intellectual disability
evidence:
- reference: PMID:38452171
reference_title: Schinzel-Giedion Syndrome.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Classic Schinzel-Giedion syndrome (SGS), an ultra-rare multisystem disorder caused by gain-of-function pathogenic variants in a SETBP1 mutational hot spot, is characterized by global neurodevelopmental impairment leading to moderate-to-profound intellectual disability, epilepsy (often refractory to treatment), hypotonia, spasticity, dysautonomia, hearing loss, and cerebral visual impairment.
explanation: >-
GeneReviews directly supports the syndrome's severe intellectual-disability
phenotype in humans.
- name: Hydronephrosis
category: Genitourinary
description: >-
Urinary tract and renal malformations are common in Schinzel-Giedion
syndrome, often including hydronephrosis.
phenotype_term:
preferred_term: Hydronephrosis
term:
id: HP:0000126
label: Hydronephrosis
evidence:
- reference: PMID:38711130
reference_title: "Novel SETBP1 D874V adjacent to the degron causes canonical schinzel-giedion syndrome: a case report and review of the literature."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
The female patient was diagnosed in the neonatal period and presented with characteristic facial phenotype (midface retraction, prominent forehead, and low-set ears), bilateral symmetrical talipes equinovarus, overlapping toes, and severe bilateral hydronephrosis accompanied by congenital heart disease, consistent with canonical SGS.
explanation: >-
This provides direct human clinical support for hydronephrosis as a
recognized SGS manifestation.
genetic:
- name: SETBP1
association: Degron-region gain-of-stability missense variants
gene_term:
preferred_term: SETBP1
term:
id: hgnc:15573
label: SETBP1
notes: >-
Classical Schinzel-Giedion syndrome is caused by de novo missense variants
in the degron region of SETBP1 that impair protein degradation and increase
aberrant transcriptional activity.
evidence:
- reference: PMID:38452171
reference_title: Schinzel-Giedion Syndrome.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Classic Schinzel-Giedion syndrome (SGS), an ultra-rare multisystem disorder caused by gain-of-function pathogenic variants in a SETBP1 mutational hot spot
explanation: >-
This provides direct human clinical support for the characteristic
SETBP1 gain-of-function variant class in classical SGS.
treatments:
- name: Supportive multidisciplinary care
description: >-
Current treatment is supportive and focuses on seizure control, nutritional
and developmental support, and surveillance for renal, respiratory, and
oncologic complications.
treatment_term:
preferred_term: supportive care
term:
id: MAXO:0000950
label: supportive care
evidence:
- reference: PMID:38452171
reference_title: Schinzel-Giedion Syndrome.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Supportive treatment to improve quality of life, maximize function, and reduce complications can include multidisciplinary care by specialists in pediatrics, neurology, physiatry, occupational and physical therapy, speech-language pathology, psychiatry, ophthalmology, ENT, surgery, pulmonology, oncology, urology, nephrology, audiology, gastroenterology, orthopedics, cardiology, and medical genetics.
explanation: >-
GeneReviews directly supports multidisciplinary supportive management as
the current standard of care.
differential_diagnoses:
- name: intellectual disability, autosomal dominant 29
disease_term:
preferred_term: intellectual disability, autosomal dominant 29
term:
id: MONDO:0014482
label: intellectual disability, autosomal dominant 29
description: >-
SETBP1 haploinsufficiency disorder overlaps genetically with SGS but is
typically milder and lacks the classical degron-mediated toxic accumulation
mechanism.
distinguishing_features:
- Classical degron-region variants with severe multisystem disease favor Schinzel-Giedion syndrome.
- Haploinsufficiency-like speech and developmental phenotypes with less severe congenital involvement favor SETBP1 haploinsufficiency disorder.
- name: Kabuki syndrome
disease_term:
preferred_term: Kabuki syndrome
term:
id: MONDO:0016512
label: Kabuki syndrome
description: >-
Kabuki syndrome can overlap through developmental delay, seizures, and
craniofacial dysmorphism, but differs in its causal genes and typical
epigenetic-developmental pattern.
distinguishing_features:
- Progressive severe neurologic disease with classical SETBP1 degron variants favors Schinzel-Giedion syndrome.
- Persistent fingertip pads and classic Kabuki facial features favor Kabuki syndrome.
clinical_trials: []
datasets:
- accession: PMID:36147799
title: Detection of a novel SETBP1 variant in a Chinese neonate with Schinzel-Giedion syndrome.
description: >-
Human longitudinal case dataset capturing neonatal presentation,
neurodevelopmental progression, seizure onset, and later hydronephrosis in a
child with molecularly confirmed Schinzel-Giedion syndrome.
organism:
preferred_term: human
term:
id: NCBITaxon:9606
label: Homo sapiens
sample_count: 1
conditions:
- Schinzel-Giedion syndrome
- de novo SETBP1 variant
publication: PMID:36147799
evidence:
- reference: PMID:36147799
reference_title: "Detection of a novel SETBP1 variant in a Chinese neonate with Schinzel-Giedion syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
A male Chinese neonate with dysmorphic facial features, nervous system disorders, and organ malformations at birth was examined in this study and long-term followed-up.
explanation: >-
This supports the publication as a disease-specific longitudinal clinical
dataset for SGS.
notes: >-
Asta deep research was run as requested, but final curation relied on direct
review of PubMed references because the retrieval output was noisy and only
partially disease-specific.