Hereditary Gingival Fibromatosis

Mendelian MONDO:0016070 Pathograph 10 Show in embeddings browser

Hereditary gingival fibromatosis (HGF) is a rare, genetically heterogeneous, benign and slowly progressive non-hemorrhagic fibrous enlargement of the maxillary and mandibular gingivae. Onset is usually at eruption of the primary or permanent dentition (occasionally at birth), and overgrowth may be localized or generalized, covering the crowns of teeth and producing delayed tooth eruption, tooth malposition, diastemas, and difficulties with speech and mastication. The defining lesion is excessive collagen (type I) deposition in the gingival connective tissue by hyperactive gingival fibroblasts, with relatively little inflammation. Most cases are non-syndromic and autosomal dominant; the disorder is genetically heterogeneous, with the SOS1 gene (chromosome 2p21-p22, HGF1/GINGF1 locus) being the first and best-characterized cause, and additional genes (REST, ZNF862) and loci (GINGF2-GINGF4) implicated. Less commonly HGF is autosomal recessive or part of a syndrome. Drug-induced gingival overgrowth (phenytoin, ciclosporin, calcium-channel blockers) is a key acquired differential diagnosis.

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3
Inheritance
5
Pathophys.
1
Histopath.
5
Phenotypes
10
Pathograph
6
Genes
4
Medical Actions
5
Subtypes
12
References
1
Deep Research
👪

Inheritance

3
Autosomal dominant inheritance HP:0000006
Most non-syndromic HGF segregates as an autosomal dominant trait with high penetrance; the prototypic SOS1 single-cytosine insertion (HGF1) segregated dominantly over four generations.
Autosomal dominant inheritance
Show evidence (1 reference)
PMID:11868160 SUPPORT Human Clinical
"This insertion mutation, which segregates in a dominant manner over four generations, introduces a frameshift and creates a premature stop codon"
Documents autosomal dominant segregation of the SOS1 HGF1 mutation across a multigenerational family.
Autosomal recessive inheritance HP:0000007
A minority of HGF families show autosomal recessive inheritance, more often when gingival overgrowth co-occurs as part of a syndrome.
Autosomal recessive inheritance
Show evidence (1 reference)
PMID:35665929 SUPPORT Human Clinical
"HGF occurs in approximately 1:750,000 individuals and can exhibit dominant or recessive inheritance."
Confirms that HGF can follow either a dominant or recessive inheritance pattern.
Digenic inheritance HP:0010984
HGF mapping to the GINGF3 locus follows a digenic mode of inheritance requiring co-occurring pathogenic variants in both ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H); a knock-in mouse model shows that either single mutation alone is insufficient and only the double mutation produces the gingival fibromatosis phenotype.
Digenic inheritance
Show evidence (2 references)
PMID:37752101 SUPPORT Human Clinical
"identified double heterozygous pathogenic mutations in the ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) genes within the GINGF3 locus related to"
Establishes the human double-heterozygous (digenic) ZNF513 + KIF3C genotype segregating with HGF at the GINGF3 locus.
PMID:37752101 SUPPORT Model Organism
"a knock-in mouse model confirmed that heterozygous or homozygous mutations within Zfp513 (p.R250W) or Kif3c (p.R412H) alone do not led to clear phenotypes with gingival fibromatosis, whereas the double mutations led to gingival hyperplasia phenotypes"
A knock-in mouse model demonstrates the epistatic digenic requirement: single-locus mutations do not produce gingival fibromatosis, only the combined ZNF513 + KIF3C double mutation does.
◆

Subtypes

5
HGF type 1 (SOS1-related, GINGF1 locus, 2p21-p22)
Autosomal dominant non-syndromic HGF caused by a heterozygous frameshift mutation in SOS1 (Son of Sevenless-1) at the GINGF1 locus on chromosome 2p21-p22. A single-cytosine insertion in codon 1083 truncates the protein, removing the C-terminal proline-rich SH3-binding domains and generating a constitutively active RAS-MAPK signaling output in gingival fibroblasts.
Show evidence (1 reference)
PMID:11868160 SUPPORT Human Clinical
"Sequencing of these genes, in affected and unaffected HGF1 family members, identified a mutation in the Son of sevenless-1 (SOS1) gene in affected individuals."
Establishes SOS1 as the HGF1 disease gene at the 2p21-p22 locus.
ZNF862-related HGF
Autosomal dominant non-syndromic HGF caused by a heterozygous missense mutation (c.2812G>A) in the zinc finger protein 862 gene (ZNF862), identified in a four-generation Chinese family, acting through increased profibrotic COL1A1 synthesis.
Show evidence (1 reference)
PMID:35142290 SUPPORT Human Clinical
"A novel heterozygous missense mutation (c.2812G > A) in zinc finger protein 862 gene (ZNF862) was identified"
Identifies ZNF862 as a causative HGF gene in an autosomal dominant family.
REST-related HGF (GINGF5 locus, 4q12)
Autosomal dominant non-syndromic HGF caused by heterozygous final-exon truncating mutations in REST (RE1-silencing transcription factor) at the GINGF5 locus on chromosome 4q12. REST is a transcriptional repressor, and the truncating alleles are thought to act through altered repressor activity rather than simple haploinsufficiency.
Show evidence (1 reference)
PMID:28686854 SUPPORT Human Clinical
"RE1-silencing transcription factor (REST) in the probands from all families"
Primary report identifying REST final-exon truncating mutations as a cause of HGF.
ZNF513 + KIF3C digenic HGF (GINGF3 locus, 2p22.3-p23.3)
HGF caused by combined (digenic) double-heterozygous pathogenic mutations in ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) within the GINGF3 locus. In a knock-in mouse model, each single mutation alone does not produce the gingival fibromatosis phenotype, whereas the double mutation does, consistent with a digenic requirement.
Show evidence (2 references)
PMID:37752101 SUPPORT Human Clinical
"identified double heterozygous pathogenic mutations in the ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) genes within the GINGF3 locus related to"
Identifies the digenic ZNF513 + KIF3C cause of HGF at the GINGF3 locus.
PMID:37752101 SUPPORT Model Organism
"a knock-in mouse model confirmed that heterozygous or homozygous mutations within Zfp513 (p.R250W) or Kif3c (p.R412H) alone do not led to clear phenotypes with gingival fibromatosis, whereas the double mutations led to gingival hyperplasia phenotypes"
A knock-in mouse model confirms the digenic requirement: single-locus mutations do not reproduce the phenotype, whereas the double mutation does.
Locus-defined HGF (GINGF2 5q13-q22, GINGF4 11p15)
Additional autosomal dominant non-syndromic HGF families map to loci for which the causative gene is not firmly established: GINGF2 (5q13-q22) and GINGF4 (11p15). These reflect the locus heterogeneity of HGF beyond the cloned genes.
Show evidence (1 reference)
PMID:35665929 SUPPORT Human Clinical
"To date, five loci (2p21-p22, 2p22.3-p23.3, 4q12, 5q13-q22, and 11p15) and three genes"
Documents the full set of mapped HGF loci establishing genetic heterogeneity.
⚙

Pathophysiology

5
Gingival Fibroblast Hyperactivity and Collagen Overproduction
The central lesion of HGF is overproduction and accumulation of type I collagen and other extracellular matrix macromolecules by hyperactive gingival fibroblasts, producing dense, relatively acellular fibrous connective tissue. Affected gingiva shows increased fibroblast numbers and increased collagen content, and HGF fibroblasts proliferate faster in culture.
Gingival fibroblast CL:0000057
Collagen biosynthetic process GO:0032964 ↑ INCREASED Extracellular matrix organization GO:0030198 ↕ DYSREGULATED Fibroblast proliferation GO:0048144 ↑ INCREASED
Downstream
Gingival fibromatosis Collagen-rich fibrous connective-tissue accumulation produces the defining gingival fibromatosis lesion.
Gingival overgrowth Fibrotic expansion of gingival connective tissue causes progressive gingival enlargement.
Tooth malposition Expanding fibrous gingiva can cover tooth crowns and mechanically displace teeth.
Delayed eruption of teeth Gingival overgrowth can mechanically impede eruption and prolong retention of primary dentition.
Feeding and speech difficulties Severe fibrous gingival enlargement can deform the palate and impair swallowing and speech.
Show evidence (2 references)
PMID:17062749 SUPPORT In Vitro
"Histological assessment of HGF gingiva indicated increased numbers of fibroblasts (30%) and increased collagen (10%). Cell proliferation studies demonstrated increased growth rates"
Demonstrates increased fibroblast numbers, collagen, and proliferation in SOS1-mutant HGF gingiva and fibroblasts.
PMID:35142290 SUPPORT In Vitro
"The functional study supports a biological role of ZNF862 for increasing the profibrotic factors particularly COL1A1 synthesis and hence resulting in HGF."
Links the ZNF862 mutation to increased COL1A1 (type I collagen) synthesis.
Constitutive RAS-MAPK Signaling in Gingival Fibroblasts
The HGF1 SOS1 frameshift removes the C-terminal autoinhibitory proline-rich SH3-binding domains of the SOS1 guanine-nucleotide exchange factor, yielding a truncated protein that drives constitutive RAS activation and downstream MAPK signaling, promoting fibroblast proliferation and a profibrotic phenotype. A KCNQ1-driven feedback amplifies Ras clustering/activation and MAPK/AP-1 output in HGF fibroblasts.
Gingival fibroblast CL:0000057
Ras protein signal transduction GO:0007265 ↑ INCREASED MAPK cascade GO:0000165 ↑ INCREASED PI3K/AKT signaling GO:0043491 ↑ INCREASED
Downstream
Gingival Fibroblast Hyperactivity and Collagen Overproduction Constitutive SOS1/RAS-MAPK and PI3K/AKT activation drives fibroblast proliferation and a profibrotic phenotype, directly fueling collagen overproduction and ECM accumulation in gingival tissue.
Show evidence (3 references)
PMID:11868160 SUPPORT Human Clinical
"introduces a frameshift and creates a premature stop codon, abolishing four functionally important proline-rich SH3 binding domains normally present in the carboxyl-terminal region of the SOS1 protein"
The SOS1 truncation removes autoinhibitory SH3-binding domains of this RAS exchange factor, the molecular basis for dysregulated RAS signaling.
PMID:33381870 SUPPORT In Vitro
"ML277 generated lateral clustering and activation of Ras on plasma membrane, followed by augmented MAPK/AP-1 signaling pathway output."
Demonstrates a KCNQ1-channel-driven Ras/MAPK activation pathway promoting the fibrogenic response in HGF gingival fibroblasts.
PMID:37752101 SUPPORT In Vitro
"proliferation, migration, and fibrosis response via the PI3K/AKT/mTOR and Ras/Raf/MEK/ERK pathways"
Shows the digenic ZNF513/KIF3C lesion drives gingival fibroblast proliferation and fibrosis through PI3K/AKT/mTOR and Ras/MAPK signaling.
Profibrotic Cytokine Signaling and Matrix-Remodeling Imbalance
HGF gingival fibroblasts show elevated TGF-beta1 and connective tissue growth factor (CTGF) signaling and increased HSP47 (a collagen-specific chaperone), together with a shift in the TIMP-1/MMP-1 ratio toward reduced matrix degradation. The combination of increased collagen synthesis and decreased matrix turnover drives net fibrotic accumulation.
Gingival fibroblast CL:0000057
Transforming growth factor beta receptor signaling pathway GO:0007179 ↑ INCREASED Collagen fibril organization GO:0030199 ↕ DYSREGULATED
Downstream
Gingival Fibroblast Hyperactivity and Collagen Overproduction TGF-beta1/CTGF signaling and the TIMP-1/MMP-1 imbalance amplify collagen synthesis while reducing matrix degradation, converging on net fibrotic accumulation in gingival fibroblasts.
Show evidence (1 reference)
PMID:29989318 SUPPORT In Vitro
"The synthesis of collagen I, HSP47, TGF-β1, CTGF and TIMP-1 was significantly elevated in HGF gingival fibroblasts compared with controls, while the production of MMP-1 was decreased."
Documents the profibrotic cytokine/chaperone upregulation and the TIMP-1/MMP-1 imbalance driving collagen I overproduction in HGF.
Oxidative Stress and Epithelial-Mesenchymal Transition
HGF gingival fibroblasts exhibit metabolic alterations including increased lipid peroxidation and reduced antioxidant CoQ10, and oxidant exposure increases collagen production in vitro. Histology shows basal lamina disruption with epithelial cells migrating into connective tissue, consistent with an epithelial-mesenchymal-transition contribution to the fibroblast pool.
Gingival fibroblast CL:0000057
Response to oxidative stress GO:0006979 ↑ INCREASED Epithelial to mesenchymal transition GO:0001837 ⚠ ABNORMAL
Downstream
Gingival Fibroblast Hyperactivity and Collagen Overproduction Oxidative stress increases collagen synthesis in gingival fibroblasts, while EMT expands the local fibroblast pool, together amplifying the fibrotic output.
Show evidence (3 references)
PMID:31130610 SUPPORT In Vitro
"The results of the biochemical analysis showed increased collagen synthesis, reduced antioxidant CoQ10 content, and high levels of lipid peroxidation."
Documents oxidative-stress metabolic alterations in HGF fibroblasts that promote collagen production.
PMID:31130610 SUPPORT Human Clinical
"A histological study revealed dense fibrous tissue, basal lamina disruption, and epithelial cell migration into the connective tissue."
Histological evidence of basal lamina disruption and epithelial migration consistent with EMT in HGF gingiva.
PMID:31130610 SUPPORT In Vitro
"fibroblasts culture incubation with the oxidant H2O2 increased collagen levels that have been reduced by the addition of the antioxidant CoQ10"
Direct causal in vitro evidence that oxidative stress (H2O2) increases collagen production in HGF gingival fibroblasts and that the antioxidant CoQ10 reverses it, linking oxidative stress to the fibrotic output.
miR-335-3p Loss and Convergent Profibrotic Network Derepression
miR-335-3p is downregulated in HGF gingival fibroblasts and in TGF-beta- stimulated normal gingival fibroblasts. This microRNA directly targets and represses several core profibrotic hubs - SOS1 (the HGF1/RAS-MAPK driver), SMAD2/3 (TGF-beta signaling), and CTNNB1 (Wnt/beta-catenin) - so its loss derepresses the convergent profibrotic program. Restoring miR-335-3p attenuates, and knocking it down promotes, the fibrogenic activity of human gingival fibroblasts, nominating it as a candidate antifibrotic target.
Gingival fibroblast CL:0000057
Transforming growth factor beta receptor signaling pathway GO:0007179 ↑ INCREASED Fibroblast proliferation GO:0048144 ↑ INCREASED
Downstream
Constitutive RAS-MAPK Signaling in Gingival Fibroblasts miR-335-3p directly represses SOS1; its loss derepresses the RAS-MAPK axis, amplifying constitutive RAS activation in gingival fibroblasts.
Profibrotic Cytokine Signaling and Matrix-Remodeling Imbalance miR-335-3p directly targets SMAD2/3 (TGF-beta downstream effectors); its loss derepresses TGF-beta/CTGF profibrotic cytokine signaling.
Show evidence (2 references)
PMID:31323181 SUPPORT In Vitro
"miR-335-3p directly targeted SOS1, SMAD2/3, and CTNNB1 by canonical and noncanonical base paring"
Identifies miR-335-3p as a regulator that represses the SOS1, SMAD2/3, and CTNNB1 profibrotic hubs converging in HGF gingival fibroblasts.
PMID:31323181 SUPPORT In Vitro
"Ectopic miR-335-3p attenuated, whereas knockdown of miR-335-3p promoted, the fibrogenic activity of human gingival fibroblasts"
Demonstrates that miR-335-3p loss promotes, and restoration attenuates, the fibrogenic activity of gingival fibroblasts.
✶

Histopathology

1
Dense hypocellular collagenous connective tissue
HGF gingiva shows hyperplastic dense fibrous connective tissue formed by thick, randomly arranged bundles of collagen with relatively few cells and little inflammation, often with elongated epithelial rete ridges; histologic features are nonspecific and diagnosis relies on clinical findings and family history.
Show evidence (1 reference)
PMID:28425619 SUPPORT Human Clinical
"Histopathological evaluation showed hyperplastic epithelium, numerous collagen bundles, and abundant-to-moderate fibroblasts in subepithelial and connective tissue."
Describes the characteristic dense collagenous histopathology of HGF gingiva.
⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for Hereditary Gingival Fibromatosis 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

5
Digestive 1
Feeding and speech difficulties Feeding difficulties HP:0011968
Show evidence (1 reference)
PMID:31130610 SUPPORT Human Clinical
"causing deformity of the palate and impairing phonation and deglutition, even reaching the midline"
Documents impaired deglutition (feeding) and phonation in severe HGF.
Head and Neck 1
Delayed eruption of teeth FREQUENT Delayed eruption of teeth HP:0000684
Show evidence (1 reference)
PMID:28425619 SUPPORT Human Clinical
"the overgrowth can cover entire crowns of the teeth, thus resulting in prolonged retention of primary dentition"
Prolonged retention of primary dentition reflects delayed/impeded tooth eruption due to the fibrous overgrowth.
Other 3
Gingival fibromatosis VERY_FREQUENT Gingival fibromatosis HP:0000169
Course: PROGRESSIVE
Show evidence (1 reference)
PMID:35665929 SUPPORT Human Clinical
"characterized by slow but progressive fibrous, non-hemorrhagic, and painless growth of the gingival tissues due to the increased deposition of collagen"
Describes the defining progressive fibrous gingival overgrowth of HGF.
Gingival overgrowth VERY_FREQUENT Gingival overgrowth HP:0000212
Show evidence (1 reference)
PMID:31130610 SUPPORT Human Clinical
"a disorder characterized by progressive enlargement of the gingiva. This enlargement results from an increase in the connective tissue elements of the submucosa"
Documents progressive gingival enlargement from connective tissue expansion.
Tooth malposition FREQUENT Tooth malposition HP:0000692
Show evidence (1 reference)
PMID:28425619 SUPPORT Human Clinical
"the overgrowth can cover entire crowns of the teeth, thus resulting in prolonged retention of primary dentition, diastemas or malposition of teeth"
Documents tooth malposition and diastemas caused by gingival overgrowth.
🧬

Genetic Associations

6
SOS1 (Causative)
Gene: SOS1 hgnc:11187
Show evidence (1 reference)
PMID:11868160 SUPPORT Human Clinical
"insertion of a cytosine between nucleotides 126,142 and 126,143 in codon 1083 of the SOS1 gene is responsible for HGF1"
Identifies the causative SOS1 insertion mutation for HGF1.
ZNF862 (Causative)
Gene: ZNF862 hgnc:34519
Show evidence (1 reference)
PMID:35142290 SUPPORT Human Clinical
"A novel heterozygous missense mutation (c.2812G > A) in zinc finger protein 862 gene (ZNF862) was identified, and it is absent among the population as per the Genome Aggregation Database."
Identifies the causative ZNF862 missense mutation in HGF.
REST (Causative)
Gene: REST hgnc:9966
Show evidence (2 references)
PMID:28686854 SUPPORT Human Clinical
"RE1-silencing transcription factor (REST) in the probands from all families"
Primary report identifying causative REST truncating mutations in HGF families.
PMID:28686854 SUPPORT Human Clinical
"REST is a transcriptional repressor that is expressed throughout the body"
Establishes REST as a transcriptional repressor, the basis for the proposed altered-repressor disease mechanism.
ZNF513 (Causative (digenic with KIF3C))
Gene: ZNF513 hgnc:26498
Show evidence (3 references)
PMID:37752101 SUPPORT Human Clinical
"identified double heterozygous pathogenic mutations in the ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) genes within the GINGF3 locus related to"
Identifies ZNF513 as one of the two digenic HGF genes at the GINGF3 locus.
PMID:37752101 SUPPORT In Vitro
"ZNF513, a transcription factor, binds to KIF3C exon 1 and participates"
Demonstrates the regulatory relationship between ZNF513 and KIF3C in gingival fibroblasts.
PMID:37752101 SUPPORT In Vitro
"ZNF513 binds to the SOS1 promoter and plays an important positive role in regulating the expression of SOS1"
Shows ZNF513 also transcriptionally up-regulates SOS1, connecting the digenic GINGF3 mechanism to the SOS1/RAS-MAPK pathway that underlies HGF1.
KIF3C (Causative (digenic with ZNF513))
Gene: KIF3C hgnc:6321
Show evidence (2 references)
PMID:37752101 SUPPORT Human Clinical
"identified double heterozygous pathogenic mutations in the ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) genes within the GINGF3 locus related to"
Identifies KIF3C as one of the two digenic HGF genes at the GINGF3 locus.
PMID:37752101 SUPPORT In Vitro
"the KIF3C p.R410H mutation could activate the PI3K and KCNQ1 potassium channels"
Links the pathogenic KIF3C variant to activation of PI3K and the KCNQ1 channel, connecting the digenic lesion to the PI3K/AKT and KCNQ1/Ras fibrogenic mechanisms.
KCNQ1 (Modifier/Mechanistic)
Gene: KCNQ1 hgnc:6294
Show evidence (2 references)
PMID:33381870 SUPPORT In Vitro
"KCNQ1 was upregulated in gingival tissues derived from HGF patients and HGF gingival fibroblasts presented increased outward K+ currents than NHGFs."
Documents KCNQ1 upregulation and increased K+ currents in HGF gingival fibroblasts as a mechanistic contributor.
PMID:33381870 SUPPORT In Vitro
"TGF-β1 and KCNQ1 channels formed a positive feed-back loop."
Identifies a KCNQ1-TGF-beta1 positive feedback loop that amplifies the profibrotic cytokine signaling driving gingival fibrosis.
💊

Medical Actions

4
Gingivectomy / Gingivoplasty
Action: gingivectomy / gingivoplasty Ontology label: Dental Procedure NCIT:C38052
Surgical removal of excess fibrous gingival tissue (gingivectomy or gingivoplasty) is the primary treatment to restore function and esthetics. Recurrence is common, especially during active dentition/orthodontic phases, so long-term maintenance is required.
Show evidence (2 references)
PMID:34565352 SUPPORT Human Clinical
"satisfying long-term outcomes can be achieved with gingivectomy, malocclusion correction, and regular follow-up maintenance."
Documents gingivectomy as the mainstay surgical treatment with the need for long-term follow-up.
PMID:34565352 SUPPORT Human Clinical
"HGF is likely to recur, with an overall recurrence rate of 34.92% after surgical treatment"
Quantifies the high post-surgical recurrence rate of HGF, underscoring the need for ongoing periodontal maintenance after gingivectomy.
Oral hygiene and periodontal maintenance
Action: oral hygiene and periodontal maintenance Ontology label: supportive care MAXO:0000950
Rigorous oral hygiene, professional scaling/debridement, and regular periodontal maintenance help control plaque-related inflammation and secondary periodontitis and limit recurrence after surgery.
Show evidence (1 reference)
PMID:34565352 SUPPORT Human Clinical
"periodontal scaling and oral hygiene reinforcement were performed regularly"
Documents oral-hygiene reinforcement and scaling as part of HGF management.
Orthodontic treatment
Action: orthodontic treatment Ontology label: Dental Procedure NCIT:C38052
Orthodontic correction of resulting malocclusion is part of a multidisciplinary approach, performed after gingival reduction; recurrence risk during orthodontics is high and requires ongoing monitoring.
Show evidence (1 reference)
PMID:34565352 SUPPORT Human Clinical
"The risk of gingival hyperplasia recurrence during and after orthodontic treatment is high"
Documents orthodontic treatment in the multidisciplinary HGF approach and its recurrence risk.
Genetic counseling
Action: Genetic Counseling NCIT:C15240
Genetic counseling is appropriate given the predominantly autosomal dominant inheritance and genetic heterogeneity of HGF.
Show evidence (1 reference)
PMID:35665929 SUPPORT Human Clinical
"HGF occurs in approximately 1:750,000 individuals and can exhibit dominant or recessive inheritance."
The Mendelian inheritance and rarity of HGF support genetic counseling for affected families.
🔬

Biochemical Markers

1
Type I collagen overproduction
Show evidence (1 reference)
PMID:29989318 SUPPORT In Vitro
"excessive production of collagen I was associated with increased synthesis of HSP47, TGF-β1 and CTGF by HGF gingival fibroblasts"
Documents collagen I overproduction with associated HSP47/TGF-beta1/CTGF upregulation.
{ }

Source YAML

click to show 
name: Hereditary Gingival Fibromatosis
creation_date: "2026-06-15T00:00:00Z"
category: Mendelian
disease_term:
  preferred_term: hereditary gingival fibromatosis
  term:
    id: MONDO:0016070
    label: hereditary gingival fibromatosis
description: >
  Hereditary gingival fibromatosis (HGF) is a rare, genetically heterogeneous,
  benign and slowly progressive non-hemorrhagic fibrous enlargement of the
  maxillary and mandibular gingivae. Onset is usually at eruption of the primary
  or permanent dentition (occasionally at birth), and overgrowth may be localized
  or generalized, covering the crowns of teeth and producing delayed tooth
  eruption, tooth malposition, diastemas, and difficulties with speech and
  mastication. The defining lesion is excessive collagen (type I) deposition in
  the gingival connective tissue by hyperactive gingival fibroblasts, with
  relatively little inflammation. Most cases are non-syndromic and autosomal
  dominant; the disorder is genetically heterogeneous, with the SOS1 gene
  (chromosome 2p21-p22, HGF1/GINGF1 locus) being the first and best-characterized
  cause, and additional genes (REST, ZNF862) and loci (GINGF2-GINGF4) implicated.
  Less commonly HGF is autosomal recessive or part of a syndrome. Drug-induced
  gingival overgrowth (phenytoin, ciclosporin, calcium-channel blockers) is a key
  acquired differential diagnosis.

inheritance:
- name: Autosomal dominant inheritance
  inheritance_term:
    preferred_term: Autosomal dominant inheritance
    term:
      id: HP:0000006
      label: Autosomal dominant inheritance
  description: >
    Most non-syndromic HGF segregates as an autosomal dominant trait with high
    penetrance; the prototypic SOS1 single-cytosine insertion (HGF1) segregated
    dominantly over four generations.
  evidence:
  - reference: PMID:11868160
    reference_title: "A mutation in the SOS1 gene causes hereditary gingival fibromatosis type 1."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "This insertion mutation, which segregates in a dominant manner over four generations, introduces a frameshift and creates a premature stop codon"
    explanation: >
      Documents autosomal dominant segregation of the SOS1 HGF1 mutation across
      a multigenerational family.
- name: Autosomal recessive inheritance
  inheritance_term:
    preferred_term: Autosomal recessive inheritance
    term:
      id: HP:0000007
      label: Autosomal recessive inheritance
  description: >
    A minority of HGF families show autosomal recessive inheritance, more often
    when gingival overgrowth co-occurs as part of a syndrome.
  evidence:
  - reference: PMID:35665929
    reference_title: "New evidence of genetic heterogeneity causing hereditary gingival fibromatosis and ALK and CD36 as new candidate genes."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "HGF occurs in approximately 1:750,000 individuals and can exhibit dominant or recessive inheritance."
    explanation: >
      Confirms that HGF can follow either a dominant or recessive inheritance
      pattern.
- name: Digenic inheritance
  inheritance_term:
    preferred_term: Digenic inheritance
    term:
      id: HP:0010984
      label: Digenic inheritance
  description: >
    HGF mapping to the GINGF3 locus follows a digenic mode of inheritance
    requiring co-occurring pathogenic variants in both ZNF513 (c.C748T, p.R250W)
    and KIF3C (c.G1229A, p.R410H); a knock-in mouse model shows that either
    single mutation alone is insufficient and only the double mutation produces
    the gingival fibromatosis phenotype.
  evidence:
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "identified double heterozygous pathogenic mutations in the ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) genes within the GINGF3 locus related to"
    explanation: >
      Establishes the human double-heterozygous (digenic) ZNF513 + KIF3C
      genotype segregating with HGF at the GINGF3 locus.
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "a knock-in mouse model confirmed that heterozygous or homozygous mutations within Zfp513 (p.R250W) or Kif3c (p.R412H) alone do not led to clear phenotypes with gingival fibromatosis, whereas the double mutations led to gingival hyperplasia phenotypes"
    explanation: >
      A knock-in mouse model demonstrates the epistatic digenic requirement:
      single-locus mutations do not produce gingival fibromatosis, only the
      combined ZNF513 + KIF3C double mutation does.

has_subtypes:
- name: HGF1
  display_name: HGF type 1 (SOS1-related, GINGF1 locus, 2p21-p22)
  description: >
    Autosomal dominant non-syndromic HGF caused by a heterozygous frameshift
    mutation in SOS1 (Son of Sevenless-1) at the GINGF1 locus on chromosome
    2p21-p22. A single-cytosine insertion in codon 1083 truncates the protein,
    removing the C-terminal proline-rich SH3-binding domains and generating a
    constitutively active RAS-MAPK signaling output in gingival fibroblasts.
  evidence:
  - reference: PMID:11868160
    reference_title: "A mutation in the SOS1 gene causes hereditary gingival fibromatosis type 1."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Sequencing of these genes, in affected and unaffected HGF1 family members, identified a mutation in the Son of sevenless-1 (SOS1) gene in affected individuals."
    explanation: >
      Establishes SOS1 as the HGF1 disease gene at the 2p21-p22 locus.
- name: ZNF862-related
  display_name: ZNF862-related HGF
  description: >
    Autosomal dominant non-syndromic HGF caused by a heterozygous missense
    mutation (c.2812G>A) in the zinc finger protein 862 gene (ZNF862),
    identified in a four-generation Chinese family, acting through increased
    profibrotic COL1A1 synthesis.
  evidence:
  - reference: PMID:35142290
    reference_title: "A novel gene ZNF862 causes hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A novel heterozygous missense mutation (c.2812G > A) in zinc finger protein 862 gene (ZNF862) was identified"
    explanation: >
      Identifies ZNF862 as a causative HGF gene in an autosomal dominant family.
- name: REST-related
  display_name: REST-related HGF (GINGF5 locus, 4q12)
  description: >
    Autosomal dominant non-syndromic HGF caused by heterozygous final-exon
    truncating mutations in REST (RE1-silencing transcription factor) at the
    GINGF5 locus on chromosome 4q12. REST is a transcriptional repressor, and
    the truncating alleles are thought to act through altered repressor activity
    rather than simple haploinsufficiency.
  evidence:
  - reference: PMID:28686854
    reference_title: "REST Final-Exon-Truncating Mutations Cause Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "RE1-silencing transcription factor (REST) in the probands from all families"
    explanation: >
      Primary report identifying REST final-exon truncating mutations as a cause
      of HGF.
- name: ZNF513/KIF3C digenic
  display_name: ZNF513 + KIF3C digenic HGF (GINGF3 locus, 2p22.3-p23.3)
  description: >
    HGF caused by combined (digenic) double-heterozygous pathogenic mutations in
    ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) within the GINGF3
    locus. In a knock-in mouse model, each single mutation alone does not produce
    the gingival fibromatosis phenotype, whereas the double mutation does,
    consistent with a digenic requirement.
  evidence:
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "identified double heterozygous pathogenic mutations in the ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) genes within the GINGF3 locus related to"
    explanation: >
      Identifies the digenic ZNF513 + KIF3C cause of HGF at the GINGF3 locus.
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "a knock-in mouse model confirmed that heterozygous or homozygous mutations within Zfp513 (p.R250W) or Kif3c (p.R412H) alone do not led to clear phenotypes with gingival fibromatosis, whereas the double mutations led to gingival hyperplasia phenotypes"
    explanation: >
      A knock-in mouse model confirms the digenic requirement: single-locus
      mutations do not reproduce the phenotype, whereas the double mutation does.
- name: Locus-defined (GINGF2, GINGF4)
  display_name: Locus-defined HGF (GINGF2 5q13-q22, GINGF4 11p15)
  description: >
    Additional autosomal dominant non-syndromic HGF families map to loci for
    which the causative gene is not firmly established: GINGF2 (5q13-q22) and
    GINGF4 (11p15). These reflect the locus heterogeneity of HGF beyond the
    cloned genes.
  evidence:
  - reference: PMID:35665929
    reference_title: "New evidence of genetic heterogeneity causing hereditary gingival fibromatosis and ALK and CD36 as new candidate genes."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "To date, five loci (2p21-p22, 2p22.3-p23.3, 4q12, 5q13-q22, and 11p15) and three genes"
    explanation: >
      Documents the full set of mapped HGF loci establishing genetic
      heterogeneity.

pathophysiology:
- name: Gingival Fibroblast Hyperactivity and Collagen Overproduction
  description: >
    The central lesion of HGF is overproduction and accumulation of type I
    collagen and other extracellular matrix macromolecules by hyperactive
    gingival fibroblasts, producing dense, relatively acellular fibrous
    connective tissue. Affected gingiva shows increased fibroblast numbers and
    increased collagen content, and HGF fibroblasts proliferate faster in
    culture.
  cell_types:
  - preferred_term: Gingival fibroblast
    term:
      id: CL:0000057
      label: fibroblast
  biological_processes:
  - preferred_term: Collagen biosynthetic process
    term:
      id: GO:0032964
      label: collagen biosynthetic process
    modifier: INCREASED
  - preferred_term: Extracellular matrix organization
    term:
      id: GO:0030198
      label: extracellular matrix organization
    modifier: DYSREGULATED
  - preferred_term: Fibroblast proliferation
    term:
      id: GO:0048144
      label: fibroblast proliferation
    modifier: INCREASED
  evidence:
  - reference: PMID:17062749
    reference_title: "Characterization of fibroblasts with Son of Sevenless-1 mutation."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Histological assessment of HGF gingiva indicated increased numbers of fibroblasts (30%) and increased collagen (10%). Cell proliferation studies demonstrated increased growth rates"
    explanation: >
      Demonstrates increased fibroblast numbers, collagen, and proliferation in
      SOS1-mutant HGF gingiva and fibroblasts.
  - reference: PMID:35142290
    reference_title: "A novel gene ZNF862 causes hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "The functional study supports a biological role of ZNF862 for increasing the profibrotic factors particularly COL1A1 synthesis and hence resulting in HGF."
    explanation: >
      Links the ZNF862 mutation to increased COL1A1 (type I collagen) synthesis.
  downstream:
  - target: Gingival fibromatosis
    causal_link_type: DIRECT
    description: >
      Collagen-rich fibrous connective-tissue accumulation produces the defining
      gingival fibromatosis lesion.
    evidence:
    - reference: PMID:35665929
      reference_title: "New evidence of genetic heterogeneity causing hereditary gingival fibromatosis and ALK and CD36 as new candidate genes."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "characterized by slow but progressive fibrous, non-hemorrhagic, and painless growth of the gingival tissues due to the increased deposition of collagen"
      explanation: >
        The review directly links progressive gingival fibromatosis to increased
        collagen deposition.
  - target: Gingival overgrowth
    causal_link_type: DIRECT
    description: >
      Fibrotic expansion of gingival connective tissue causes progressive
      gingival enlargement.
    evidence:
    - reference: PMID:31130610
      reference_title: "Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "a disorder characterized by progressive enlargement of the gingiva. This enlargement results from an increase in the connective tissue elements of the submucosa"
      explanation: >
        This clinical report links gingival enlargement to expanded connective
        tissue elements.
  - target: Tooth malposition
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    intermediate_mechanisms:
    - fibrous gingival overgrowth covering tooth crowns
    - deformation of the dental arch
    description: >
      Expanding fibrous gingiva can cover tooth crowns and mechanically displace
      teeth.
    evidence:
    - reference: PMID:28425619
      reference_title: "Analysis of mutations in the SOS-1 gene in two Polish families with hereditary gingival fibromatosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "the overgrowth can cover entire crowns of the teeth, thus resulting in prolonged retention of primary dentition, diastemas or malposition of teeth"
      explanation: >
        The full-text review section describes malposition as a direct
        consequence of gingival overgrowth covering tooth crowns.
  - target: Delayed eruption of teeth
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    intermediate_mechanisms:
    - fibrous gingival overgrowth covering tooth crowns
    description: >
      Gingival overgrowth can mechanically impede eruption and prolong retention
      of primary dentition.
    evidence:
    - reference: PMID:28425619
      reference_title: "Analysis of mutations in the SOS-1 gene in two Polish families with hereditary gingival fibromatosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "the overgrowth can cover entire crowns of the teeth, thus resulting in prolonged retention of primary dentition"
      explanation: >
        Crown-covering gingival overgrowth explains delayed or impeded tooth
        eruption.
  - target: Feeding and speech difficulties
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    intermediate_mechanisms:
    - palatal deformity from severe gingival overgrowth
    - impaired deglutition and phonation
    description: >
      Severe fibrous gingival enlargement can deform the palate and impair
      swallowing and speech.
    evidence:
    - reference: PMID:31130610
      reference_title: "Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "causing deformity of the palate and impairing phonation and deglutition, even reaching the midline"
      explanation: >
        This report directly connects severe gingival enlargement with impaired
        phonation and deglutition.

- name: Constitutive RAS-MAPK Signaling in Gingival Fibroblasts
  description: >
    The HGF1 SOS1 frameshift removes the C-terminal autoinhibitory proline-rich
    SH3-binding domains of the SOS1 guanine-nucleotide exchange factor, yielding
    a truncated protein that drives constitutive RAS activation and downstream
    MAPK signaling, promoting fibroblast proliferation and a profibrotic
    phenotype. A KCNQ1-driven feedback amplifies Ras clustering/activation and
    MAPK/AP-1 output in HGF fibroblasts.
  cell_types:
  - preferred_term: Gingival fibroblast
    term:
      id: CL:0000057
      label: fibroblast
  biological_processes:
  - preferred_term: Ras protein signal transduction
    term:
      id: GO:0007265
      label: Ras protein signal transduction
    modifier: INCREASED
  - preferred_term: MAPK cascade
    term:
      id: GO:0000165
      label: MAPK cascade
    modifier: INCREASED
  - preferred_term: PI3K/AKT signaling
    term:
      id: GO:0043491
      label: phosphatidylinositol 3-kinase/protein kinase B signal transduction
    modifier: INCREASED
  evidence:
  - reference: PMID:11868160
    reference_title: "A mutation in the SOS1 gene causes hereditary gingival fibromatosis type 1."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "introduces a frameshift and creates a premature stop codon, abolishing four functionally important proline-rich SH3 binding domains normally present in the carboxyl-terminal region of the SOS1 protein"
    explanation: >
      The SOS1 truncation removes autoinhibitory SH3-binding domains of this
      RAS exchange factor, the molecular basis for dysregulated RAS signaling.
  - reference: PMID:33381870
    reference_title: "Activated KCNQ1 channel promotes fibrogenic response in hereditary gingival fibromatosis via clustering and activation of Ras."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "ML277 generated lateral clustering and activation of Ras on plasma membrane, followed by augmented MAPK/AP-1 signaling pathway output."
    explanation: >
      Demonstrates a KCNQ1-channel-driven Ras/MAPK activation pathway promoting
      the fibrogenic response in HGF gingival fibroblasts.
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "proliferation, migration, and fibrosis response via the PI3K/AKT/mTOR and Ras/Raf/MEK/ERK pathways"
    explanation: >
      Shows the digenic ZNF513/KIF3C lesion drives gingival fibroblast
      proliferation and fibrosis through PI3K/AKT/mTOR and Ras/MAPK signaling.
  downstream:
  - target: Gingival Fibroblast Hyperactivity and Collagen Overproduction
    description: >-
      Constitutive SOS1/RAS-MAPK and PI3K/AKT activation drives fibroblast
      proliferation and a profibrotic phenotype, directly fueling collagen
      overproduction and ECM accumulation in gingival tissue.

- name: Profibrotic Cytokine Signaling and Matrix-Remodeling Imbalance
  description: >
    HGF gingival fibroblasts show elevated TGF-beta1 and connective tissue
    growth factor (CTGF) signaling and increased HSP47 (a collagen-specific
    chaperone), together with a shift in the TIMP-1/MMP-1 ratio toward reduced
    matrix degradation. The combination of increased collagen synthesis and
    decreased matrix turnover drives net fibrotic accumulation.
  cell_types:
  - preferred_term: Gingival fibroblast
    term:
      id: CL:0000057
      label: fibroblast
  biological_processes:
  - preferred_term: Transforming growth factor beta receptor signaling pathway
    term:
      id: GO:0007179
      label: transforming growth factor beta receptor signaling pathway
    modifier: INCREASED
  - preferred_term: Collagen fibril organization
    term:
      id: GO:0030199
      label: collagen fibril organization
    modifier: DYSREGULATED
  evidence:
  - reference: PMID:29989318
    reference_title: "TIMP-1 association with collagen type I overproduction in hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "The synthesis of collagen I, HSP47, TGF-β1, CTGF and TIMP-1 was significantly elevated in HGF gingival fibroblasts compared with controls, while the production of MMP-1 was decreased."
    explanation: >
      Documents the profibrotic cytokine/chaperone upregulation and the
      TIMP-1/MMP-1 imbalance driving collagen I overproduction in HGF.
  downstream:
  - target: Gingival Fibroblast Hyperactivity and Collagen Overproduction
    description: >-
      TGF-beta1/CTGF signaling and the TIMP-1/MMP-1 imbalance amplify collagen
      synthesis while reducing matrix degradation, converging on net fibrotic
      accumulation in gingival fibroblasts.

- name: Oxidative Stress and Epithelial-Mesenchymal Transition
  description: >
    HGF gingival fibroblasts exhibit metabolic alterations including increased
    lipid peroxidation and reduced antioxidant CoQ10, and oxidant exposure
    increases collagen production in vitro. Histology shows basal lamina
    disruption with epithelial cells migrating into connective tissue,
    consistent with an epithelial-mesenchymal-transition contribution to the
    fibroblast pool.
  cell_types:
  - preferred_term: Gingival fibroblast
    term:
      id: CL:0000057
      label: fibroblast
  biological_processes:
  - preferred_term: Response to oxidative stress
    term:
      id: GO:0006979
      label: response to oxidative stress
    modifier: INCREASED
  - preferred_term: Epithelial to mesenchymal transition
    term:
      id: GO:0001837
      label: epithelial to mesenchymal transition
    modifier: ABNORMAL
  evidence:
  - reference: PMID:31130610
    reference_title: "Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "The results of the biochemical analysis showed increased collagen synthesis, reduced antioxidant CoQ10 content, and high levels of lipid peroxidation."
    explanation: >
      Documents oxidative-stress metabolic alterations in HGF fibroblasts that
      promote collagen production.
  - reference: PMID:31130610
    reference_title: "Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A histological study revealed dense fibrous tissue, basal lamina disruption, and epithelial cell migration into the connective tissue."
    explanation: >
      Histological evidence of basal lamina disruption and epithelial migration
      consistent with EMT in HGF gingiva.
  - reference: PMID:31130610
    reference_title: "Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "fibroblasts culture incubation with the oxidant H2O2 increased collagen levels that have been reduced by the addition of the antioxidant CoQ10"
    explanation: >
      Direct causal in vitro evidence that oxidative stress (H2O2) increases
      collagen production in HGF gingival fibroblasts and that the antioxidant
      CoQ10 reverses it, linking oxidative stress to the fibrotic output.
  downstream:
  - target: Gingival Fibroblast Hyperactivity and Collagen Overproduction
    description: >-
      Oxidative stress increases collagen synthesis in gingival fibroblasts,
      while EMT expands the local fibroblast pool, together amplifying the
      fibrotic output.

- name: miR-335-3p Loss and Convergent Profibrotic Network Derepression
  description: >
    miR-335-3p is downregulated in HGF gingival fibroblasts and in TGF-beta-
    stimulated normal gingival fibroblasts. This microRNA directly targets and
    represses several core profibrotic hubs - SOS1 (the HGF1/RAS-MAPK driver),
    SMAD2/3 (TGF-beta signaling), and CTNNB1 (Wnt/beta-catenin) - so its loss
    derepresses the convergent profibrotic program. Restoring miR-335-3p
    attenuates, and knocking it down promotes, the fibrogenic activity of human
    gingival fibroblasts, nominating it as a candidate antifibrotic target.
  cell_types:
  - preferred_term: Gingival fibroblast
    term:
      id: CL:0000057
      label: fibroblast
  biological_processes:
  - preferred_term: Transforming growth factor beta receptor signaling pathway
    term:
      id: GO:0007179
      label: transforming growth factor beta receptor signaling pathway
    modifier: INCREASED
  - preferred_term: Fibroblast proliferation
    term:
      id: GO:0048144
      label: fibroblast proliferation
    modifier: INCREASED
  evidence:
  - reference: PMID:31323181
    reference_title: "Antifibrotic Potential of MiR-335-3p in Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "miR-335-3p directly targeted SOS1, SMAD2/3, and CTNNB1 by canonical and noncanonical base paring"
    explanation: >
      Identifies miR-335-3p as a regulator that represses the SOS1, SMAD2/3, and
      CTNNB1 profibrotic hubs converging in HGF gingival fibroblasts.
  - reference: PMID:31323181
    reference_title: "Antifibrotic Potential of MiR-335-3p in Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Ectopic miR-335-3p attenuated, whereas knockdown of miR-335-3p promoted, the fibrogenic activity of human gingival fibroblasts"
    explanation: >
      Demonstrates that miR-335-3p loss promotes, and restoration attenuates, the
      fibrogenic activity of gingival fibroblasts.
  downstream:
  - target: Constitutive RAS-MAPK Signaling in Gingival Fibroblasts
    description: >-
      miR-335-3p directly represses SOS1; its loss derepresses the RAS-MAPK
      axis, amplifying constitutive RAS activation in gingival fibroblasts.
  - target: Profibrotic Cytokine Signaling and Matrix-Remodeling Imbalance
    description: >-
      miR-335-3p directly targets SMAD2/3 (TGF-beta downstream effectors); its
      loss derepresses TGF-beta/CTGF profibrotic cytokine signaling.

phenotypes:
- category: Oral
  name: Gingival fibromatosis
  description: >
    Generalized or localized fibrous overgrowth of the maxillary and mandibular
    gingivae, the defining feature of HGF.
  phenotype_term:
    preferred_term: Gingival fibromatosis
    term:
      id: HP:0000169
      label: Gingival fibromatosis
    clinical_course: PROGRESSIVE
  frequency: VERY_FREQUENT
  evidence:
  - reference: PMID:35665929
    reference_title: "New evidence of genetic heterogeneity causing hereditary gingival fibromatosis and ALK and CD36 as new candidate genes."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "characterized by slow but progressive fibrous, non-hemorrhagic, and painless growth of the gingival tissues due to the increased deposition of collagen"
    explanation: >
      Describes the defining progressive fibrous gingival overgrowth of HGF.
- category: Oral
  name: Gingival overgrowth
  description: >
    Enlargement of gingival tissue that can cover the crowns of teeth and deform
    the dental arch.
  phenotype_term:
    preferred_term: Gingival overgrowth
    term:
      id: HP:0000212
      label: Gingival overgrowth
  frequency: VERY_FREQUENT
  evidence:
  - reference: PMID:31130610
    reference_title: "Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "a disorder characterized by progressive enlargement of the gingiva. This enlargement results from an increase in the connective tissue elements of the submucosa"
    explanation: >
      Documents progressive gingival enlargement from connective tissue
      expansion.
- category: Oral
  name: Tooth malposition
  description: >
    Displacement and malposition of teeth, including diastemas and crowding,
    resulting from the expanding fibrous gingival mass.
  phenotype_term:
    preferred_term: Tooth malposition
    term:
      id: HP:0000692
      label: Tooth malposition
  frequency: FREQUENT
  evidence:
  - reference: PMID:28425619
    reference_title: "Analysis of mutations in the SOS-1 gene in two Polish families with hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "the overgrowth can cover entire crowns of the teeth, thus resulting in prolonged retention of primary dentition, diastemas or malposition of teeth"
    explanation: >
      Documents tooth malposition and diastemas caused by gingival overgrowth.
- category: Oral
  name: Delayed eruption of teeth
  description: >
    Mechanical impedance of tooth eruption by the fibrous gingival mass, with
    prolonged retention of primary dentition.
  phenotype_term:
    preferred_term: Delayed eruption of teeth
    term:
      id: HP:0000684
      label: Delayed eruption of teeth
  frequency: FREQUENT
  evidence:
  - reference: PMID:28425619
    reference_title: "Analysis of mutations in the SOS-1 gene in two Polish families with hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "the overgrowth can cover entire crowns of the teeth, thus resulting in prolonged retention of primary dentition"
    explanation: >
      Prolonged retention of primary dentition reflects delayed/impeded tooth
      eruption due to the fibrous overgrowth.
- category: Constitutional
  name: Feeding and speech difficulties
  description: >
    Severe gingival overgrowth can impair mastication and phonation, sometimes
    with palatal deformity extending to the midline.
  phenotype_term:
    preferred_term: Feeding difficulties
    term:
      id: HP:0011968
      label: Feeding difficulties
  evidence:
  - reference: PMID:31130610
    reference_title: "Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "causing deformity of the palate and impairing phonation and deglutition, even reaching the midline"
    explanation: >
      Documents impaired deglutition (feeding) and phonation in severe HGF.

biochemical:
- name: Type I collagen overproduction
  notes: >
    HGF gingival fibroblasts overproduce type I collagen, the biochemical
    hallmark of the disorder, accompanied by elevated HSP47 collagen chaperone.
  evidence:
  - reference: PMID:29989318
    reference_title: "TIMP-1 association with collagen type I overproduction in hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "excessive production of collagen I was associated with increased synthesis of HSP47, TGF-β1 and CTGF by HGF gingival fibroblasts"
    explanation: >
      Documents collagen I overproduction with associated HSP47/TGF-beta1/CTGF
      upregulation.

genetic:
- name: SOS1
  gene_term:
    preferred_term: SOS1
    term:
      id: hgnc:11187
      label: SOS1
  association: Causative
  subtype: HGF1
  notes: >
    Heterozygous frameshift insertion (single cytosine in codon 1083) at the
    GINGF1 locus (2p21-p22); the first identified and best-characterized cause of
    non-syndromic autosomal dominant HGF (type 1).
  evidence:
  - reference: PMID:11868160
    reference_title: "A mutation in the SOS1 gene causes hereditary gingival fibromatosis type 1."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "insertion of a cytosine between nucleotides 126,142 and 126,143 in codon 1083 of the SOS1 gene is responsible for HGF1"
    explanation: >
      Identifies the causative SOS1 insertion mutation for HGF1.
- name: ZNF862
  gene_term:
    preferred_term: ZNF862
    term:
      id: hgnc:34519
      label: ZNF862
  association: Causative
  subtype: ZNF862-related
  notes: >
    Heterozygous missense mutation (c.2812G>A) identified in an autosomal
    dominant Chinese HGF family; functions by increasing profibrotic COL1A1
    synthesis.
  evidence:
  - reference: PMID:35142290
    reference_title: "A novel gene ZNF862 causes hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A novel heterozygous missense mutation (c.2812G > A) in zinc finger protein 862 gene (ZNF862) was identified, and it is absent among the population as per the Genome Aggregation Database."
    explanation: >
      Identifies the causative ZNF862 missense mutation in HGF.
- name: REST
  gene_term:
    preferred_term: REST
    term:
      id: hgnc:9966
      label: REST
  association: Causative
  subtype: REST-related
  notes: >
    RE1-silencing transcription factor (GINGF5 locus, 4q12); heterozygous
    final-exon truncating variants (frameshift and nonsense) cause autosomal
    dominant HGF, identified by whole-exome sequencing across multiple families.
  evidence:
  - reference: PMID:28686854
    reference_title: "REST Final-Exon-Truncating Mutations Cause Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "RE1-silencing transcription factor (REST) in the probands from all families"
    explanation: >
      Primary report identifying causative REST truncating mutations in HGF
      families.
  - reference: PMID:28686854
    reference_title: "REST Final-Exon-Truncating Mutations Cause Hereditary Gingival Fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "REST is a transcriptional repressor that is expressed throughout the body"
    explanation: >
      Establishes REST as a transcriptional repressor, the basis for the
      proposed altered-repressor disease mechanism.
- name: ZNF513
  gene_term:
    preferred_term: ZNF513
    term:
      id: hgnc:26498
      label: ZNF513
  association: Causative (digenic with KIF3C)
  subtype: ZNF513/KIF3C digenic
  notes: >
    Transcription factor at the GINGF3 locus; the pathogenic ZNF513 c.C748T
    (p.R250W) variant requires a co-occurring KIF3C variant to produce HGF.
    ZNF513 binds KIF3C exon 1 and positively regulates KIF3C expression in
    gingival fibroblasts, and also binds the SOS1 promoter to positively
    regulate SOS1 expression, linking the digenic GINGF3 lesion to the canonical
    SOS1/RAS-MAPK driver.
  evidence:
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "identified double heterozygous pathogenic mutations in the ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) genes within the GINGF3 locus related to"
    explanation: >
      Identifies ZNF513 as one of the two digenic HGF genes at the GINGF3 locus.
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "ZNF513, a transcription factor, binds to KIF3C exon 1 and participates"
    explanation: >
      Demonstrates the regulatory relationship between ZNF513 and KIF3C in
      gingival fibroblasts.
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "ZNF513 binds to the SOS1 promoter and plays an important positive role in regulating the expression of SOS1"
    explanation: >
      Shows ZNF513 also transcriptionally up-regulates SOS1, connecting the
      digenic GINGF3 mechanism to the SOS1/RAS-MAPK pathway that underlies HGF1.
- name: KIF3C
  gene_term:
    preferred_term: KIF3C
    term:
      id: hgnc:6321
      label: KIF3C
  association: Causative (digenic with ZNF513)
  subtype: ZNF513/KIF3C digenic
  notes: >
    Kinesin family member at the GINGF3 locus; the pathogenic KIF3C c.G1229A
    (p.R410H) variant, in combination with the ZNF513 variant, drives gingival
    fibroblast proliferation and fibrosis via PI3K/AKT/mTOR and Ras/MAPK
    signaling. The KIF3C p.R410H mutation activates PI3K and the KCNQ1
    potassium channel, converging on the same fibrogenic effectors implicated
    in HGF.
  evidence:
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "identified double heterozygous pathogenic mutations in the ZNF513 (c.C748T, p.R250W) and KIF3C (c.G1229A, p.R410H) genes within the GINGF3 locus related to"
    explanation: >
      Identifies KIF3C as one of the two digenic HGF genes at the GINGF3 locus.
  - reference: PMID:37752101
    reference_title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "the KIF3C p.R410H mutation could activate the PI3K and KCNQ1 potassium channels"
    explanation: >
      Links the pathogenic KIF3C variant to activation of PI3K and the KCNQ1
      channel, connecting the digenic lesion to the PI3K/AKT and KCNQ1/Ras
      fibrogenic mechanisms.
- name: KCNQ1
  gene_term:
    preferred_term: KCNQ1
    term:
      id: hgnc:6294
      label: KCNQ1
  association: Modifier/Mechanistic
  notes: >
    Not an established Mendelian HGF gene, but the KCNQ1 potassium channel is
    upregulated in HGF gingiva and drives a fibrogenic Ras/MAPK response in
    gingival fibroblasts, implicating it in HGF pathophysiology. KCNQ1 and
    TGF-beta1 form a positive feedback loop that reinforces the profibrotic
    response.
  evidence:
  - reference: PMID:33381870
    reference_title: "Activated KCNQ1 channel promotes fibrogenic response in hereditary gingival fibromatosis via clustering and activation of Ras."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "KCNQ1 was upregulated in gingival tissues derived from HGF patients and HGF gingival fibroblasts presented increased outward K+ currents than NHGFs."
    explanation: >
      Documents KCNQ1 upregulation and increased K+ currents in HGF gingival
      fibroblasts as a mechanistic contributor.
  - reference: PMID:33381870
    reference_title: "Activated KCNQ1 channel promotes fibrogenic response in hereditary gingival fibromatosis via clustering and activation of Ras."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "TGF-β1 and KCNQ1 channels formed a positive feed-back loop."
    explanation: >
      Identifies a KCNQ1-TGF-beta1 positive feedback loop that amplifies the
      profibrotic cytokine signaling driving gingival fibrosis.

histopathology:
- name: Dense hypocellular collagenous connective tissue
  description: >
    HGF gingiva shows hyperplastic dense fibrous connective tissue formed by
    thick, randomly arranged bundles of collagen with relatively few cells and
    little inflammation, often with elongated epithelial rete ridges; histologic
    features are nonspecific and diagnosis relies on clinical findings and family
    history.
  evidence:
  - reference: PMID:28425619
    reference_title: "Analysis of mutations in the SOS-1 gene in two Polish families with hereditary gingival fibromatosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Histopathological evaluation showed hyperplastic epithelium, numerous collagen bundles, and abundant-to-moderate fibroblasts in subepithelial and connective tissue."
    explanation: >
      Describes the characteristic dense collagenous histopathology of HGF
      gingiva.

treatments:
- name: Gingivectomy / Gingivoplasty
  description: >
    Surgical removal of excess fibrous gingival tissue (gingivectomy or
    gingivoplasty) is the primary treatment to restore function and esthetics.
    Recurrence is common, especially during active dentition/orthodontic phases,
    so long-term maintenance is required.
  treatment_term:
    preferred_term: gingivectomy / gingivoplasty
    term:
      id: NCIT:C38052
      label: Dental Procedure
  evidence:
  - reference: PMID:34565352
    reference_title: "Seven-year follow-up of a patient with hereditary gingival fibromatosis treated with a multidisciplinary approach: case report."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "satisfying long-term outcomes can be achieved with gingivectomy, malocclusion correction, and regular follow-up maintenance."
    explanation: >
      Documents gingivectomy as the mainstay surgical treatment with the need
      for long-term follow-up.
  - reference: PMID:34565352
    reference_title: "Seven-year follow-up of a patient with hereditary gingival fibromatosis treated with a multidisciplinary approach: case report."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "HGF is likely to recur, with an overall recurrence rate of 34.92% after surgical treatment"
    explanation: >
      Quantifies the high post-surgical recurrence rate of HGF, underscoring the
      need for ongoing periodontal maintenance after gingivectomy.
- name: Oral hygiene and periodontal maintenance
  description: >
    Rigorous oral hygiene, professional scaling/debridement, and regular
    periodontal maintenance help control plaque-related inflammation and
    secondary periodontitis and limit recurrence after surgery.
  treatment_term:
    preferred_term: oral hygiene and periodontal maintenance
    term:
      id: MAXO:0000950
      label: supportive care
  evidence:
  - reference: PMID:34565352
    reference_title: "Seven-year follow-up of a patient with hereditary gingival fibromatosis treated with a multidisciplinary approach: case report."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "periodontal scaling and oral hygiene reinforcement were performed regularly"
    explanation: >
      Documents oral-hygiene reinforcement and scaling as part of HGF
      management.
- name: Orthodontic treatment
  description: >
    Orthodontic correction of resulting malocclusion is part of a
    multidisciplinary approach, performed after gingival reduction; recurrence
    risk during orthodontics is high and requires ongoing monitoring.
  treatment_term:
    preferred_term: orthodontic treatment
    term:
      id: NCIT:C38052
      label: Dental Procedure
  evidence:
  - reference: PMID:34565352
    reference_title: "Seven-year follow-up of a patient with hereditary gingival fibromatosis treated with a multidisciplinary approach: case report."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The risk of gingival hyperplasia recurrence during and after orthodontic treatment is high"
    explanation: >
      Documents orthodontic treatment in the multidisciplinary HGF approach and
      its recurrence risk.
- name: Genetic counseling
  description: >
    Genetic counseling is appropriate given the predominantly autosomal dominant
    inheritance and genetic heterogeneity of HGF.
  treatment_term:
    preferred_term: Genetic Counseling
    term:
      id: NCIT:C15240
      label: Genetic Counseling
  evidence:
  - reference: PMID:35665929
    reference_title: "New evidence of genetic heterogeneity causing hereditary gingival fibromatosis and ALK and CD36 as new candidate genes."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "HGF occurs in approximately 1:750,000 individuals and can exhibit dominant or recessive inheritance."
    explanation: >
      The Mendelian inheritance and rarity of HGF support genetic counseling for
      affected families.

references:
- reference: PMID:11868160
  title: "A mutation in the SOS1 gene causes hereditary gingival fibromatosis type 1."
- reference: PMID:28686854
  title: "REST Final-Exon-Truncating Mutations Cause Hereditary Gingival Fibromatosis."
- reference: PMID:35142290
  title: "A novel gene ZNF862 causes hereditary gingival fibromatosis."
- reference: PMID:37752101
  title: "Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis."
- reference: PMID:31323181
  title: "Antifibrotic Potential of MiR-335-3p in Hereditary Gingival Fibromatosis."
- reference: PMID:35665929
  title: "New evidence of genetic heterogeneity causing hereditary gingival fibromatosis and ALK and CD36 as new candidate genes."
- reference: PMID:17062749
  title: "Characterization of fibroblasts with Son of Sevenless-1 mutation."
- reference: PMID:29989318
  title: "TIMP-1 association with collagen type I overproduction in hereditary gingival fibromatosis."
- reference: PMID:31130610
  title: "Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis."
- reference: PMID:28425619
  title: "Analysis of mutations in the SOS-1 gene in two Polish families with hereditary gingival fibromatosis."
- reference: PMID:33381870
  title: "Activated KCNQ1 channel promotes fibrogenic response in hereditary gingival fibromatosis via clustering and activation of Ras."
- reference: PMID:34565352
  title: "Seven-year follow-up of a patient with hereditary gingival fibromatosis treated with a multidisciplinary approach: case report."
📚

References & Deep Research

References

12
PMID:11868160
A mutation in the SOS1 gene causes hereditary gingival fibromatosis type 1.
No top-level findings curated for this source.
PMID:28686854
REST Final-Exon-Truncating Mutations Cause Hereditary Gingival Fibromatosis.
No top-level findings curated for this source.
PMID:35142290
A novel gene ZNF862 causes hereditary gingival fibromatosis.
No top-level findings curated for this source.
PMID:37752101
Double heterozygous pathogenic mutations in KIF3C and ZNF513 cause hereditary gingival fibromatosis.
No top-level findings curated for this source.
PMID:31323181
Antifibrotic Potential of MiR-335-3p in Hereditary Gingival Fibromatosis.
No top-level findings curated for this source.
PMID:35665929
New evidence of genetic heterogeneity causing hereditary gingival fibromatosis and ALK and CD36 as new candidate genes.
No top-level findings curated for this source.
PMID:17062749
Characterization of fibroblasts with Son of Sevenless-1 mutation.
No top-level findings curated for this source.
PMID:29989318
TIMP-1 association with collagen type I overproduction in hereditary gingival fibromatosis.
No top-level findings curated for this source.
PMID:31130610
Fibroblasts Collagen Production and Histological Alterations in Hereditary Gingival Fibromatosis.
No top-level findings curated for this source.
PMID:28425619
Analysis of mutations in the SOS-1 gene in two Polish families with hereditary gingival fibromatosis.
No top-level findings curated for this source.
PMID:33381870
Activated KCNQ1 channel promotes fibrogenic response in hereditary gingival fibromatosis via clustering and activation of Ras.
No top-level findings curated for this source.
PMID:34565352
Seven-year follow-up of a patient with hereditary gingival fibromatosis treated with a multidisciplinary approach: case report.
No top-level findings curated for this source.

Deep Research

1
Falcon ▸
Disease Characteristics Research Template
Edison Scientific Literature 44 citations 2026-06-15T21:43:59.086329

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on: 1. Key concepts and definitions with current understanding 2. Recent developments and latest research (prioritize 2023-2024 sources) 3. Current applications and real-world implementations 4. Expert opinions and analysis from authoritative sources 5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available. Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Disease Characteristics Research Template

Target Disease

  • Disease Name: Hereditary Gingival Fibromatosis
  • MONDO ID: (if available)
  • Category: Mendelian

Research Objectives

Please provide a comprehensive research report on Hereditary Gingival Fibromatosis covering all of the disease characteristics listed below. This report will be used to populate a disease knowledge base entry. Be thorough and cite primary literature (PMID preferred) for all claims.

For each section, suggested databases/resources are listed. These are the first places you should search for information on each topic.

1. Disease Information

Search first: OMIM, Orphanet, ICD-10/ICD-11, MeSH, PubMed

  • What is the disease? Provide a concise overview.
  • What are the key identifiers? (OMIM, Orphanet, ICD-10/ICD-11, MeSH, Mondo)
  • What are the common synonyms and alternative names?
  • Is the information derived from individual patients (e.g., EHR) or aggregated disease-level resources?

2. Etiology

  • Disease Causal Factors: What are the primary causes? (genetic, environmental, infectious, mechanistic)
  • Risk Factors:

    Search first: PubMed, Cochrane Library, UpToDate, clinical guidelines, ClinVar, ClinGen, GWAS Catalog, PheGenI, CTD, CDC, WHO, epidemiological databases

  • Genetic risk factors (causal variants, susceptibility loci, modifier genes)
  • Environmental risk factors (toxins, lifestyle, occupational exposures, age, sex, family history)
  • Protective Factors:

    Search first: PubMed, Cochrane Library, clinical trial databases, GWAS Catalog, gnomAD, WHO, CDC, nutrition databases

  • Genetic protective factors (protective variants, modifier alleles)
  • Environmental protective factors (diet, lifestyle, exposures that reduce risk)
  • Gene-Environment Interactions: How do genetic and environmental factors interact to influence disease?

    Search first: CTD, PubMed, PheGenI, GxE databases

3. Phenotypes

Search first: HPO (Human Phenotype Ontology), OMIM, Orphanet, PubMed, clinicaltrials.gov, MedDRA, SNOMED CT, DECIPHER, LOINC

For each phenotype, provide: - Phenotype type: symptoms, clinical signs, physical manifestations, behavioral changes, or laboratory abnormalities

For symptoms/signs: HPO, OMIM, Orphanet, PubMed For behavioral changes: HPO, DSM, RDoC (Research Domain Criteria), PubMed For laboratory abnormalities: LOINC, SNOMED CT, LabTests Online, PubMed - Phenotype characteristics: Search first: OMIM, Orphanet, HPO, PubMed - Age of symptom onset (neonatal, childhood, adult-onset, late-onset) - Symptom severity (mild, moderate, severe, variable) - Symptom progression (stable, progressive, episodic, fluctuating) - Frequency among affected individuals (percentage or qualitative) - Quality of life impact: Effects on daily functioning and well-being (per-phenotype when possible) Search first: EQ-5D database, SF-36, WHO QOL databases, PubMed - Suggest HPO (Human Phenotype Ontology) terms for each phenotype

4. Genetic/Molecular Information

  • Causal Genes: Gene mutations or chromosomal abnormalities responsible for disease (gene symbols, OMIM IDs)

    Search first: OMIM, ClinVar, HGMD, Ensembl, NCBI Gene

  • Pathogenic Variants:
  • Affected genes (gene symbols, HGNC IDs) > Search first: OMIM, NCBI Gene, Ensembl, HGNC, UniProt, GeneCards
  • Variant classification (pathogenic, likely pathogenic, VUS per ACMG/AMP guidelines) > Search first: ClinVar, ClinGen, ACMG/AMP guidelines, VarSome
  • Variant type/class (missense, frameshift, nonsense, splice-site, structural)
  • Allele frequency in population databases > Search first: gnomAD, 1000 Genomes, ExAC, TOPMed, dbSNP
  • Somatic vs germline origin > Search first: COSMIC (somatic), ClinVar, ICGC, TCGA
  • Functional consequences (loss of function, gain of function, dominant negative)
  • Modifier Genes: Genes that modify disease severity or expression
  • Epigenetic Information: DNA methylation, histone modifications, chromatin changes affecting disease

    Search first: ENCODE, Roadmap Epigenomics, MethBase, DiseaseMeth

  • Chromosomal Abnormalities: Large-scale genetic changes (aneuploidy, translocations, inversions)

    Search first: DECIPHER, ClinVar, ECARUCA, UCSC Genome Browser

5. Environmental Information

  • Environmental Factors: Non-genetic contributing factors (toxins, radiation, pollution, occupational exposure)

    Search first: CTD (Comparative Toxicogenomics Database), TOXNET, PubMed, EPA databases

  • Lifestyle Factors: Behavioral factors (smoking, diet, exercise, alcohol consumption)

    Search first: CDC databases, WHO, PubMed, NHANES

  • Infectious Agents: If applicable, pathogens causing or triggering disease (bacteria, viruses, fungi, parasites)

    Search first: NCBI Taxonomy, ViPR, BV-BRC, MicrobeDB, GIDEON

6. Mechanism / Pathophysiology

  • Molecular Pathways: Specific signaling cascades or biochemical pathways involved (Wnt, MAPK, mTOR, PI3K-AKT, etc.)

    Search first: KEGG, Reactome, WikiPathways, PathBank, BioCyc

  • Cellular Processes: Cell-level mechanisms (apoptosis, autophagy, cell cycle dysregulation, inflammation, etc.)

    Search first: Gene Ontology (GO), Reactome, KEGG, PubMed

  • Protein Dysfunction: How protein structure or function is altered (misfolding, aggregation, loss of function, gain of function)

    Search first: UniProt, PDB (Protein Data Bank), InterPro, Pfam, AlphaFold

  • Metabolic Changes: Alterations in metabolic processes (energy metabolism, lipid metabolism, amino acid metabolism)

    Search first: KEGG, BioCyc, HMDB (Human Metabolome Database), BRENDA

  • Immune System Involvement: Role of immune response (autoimmunity, immunodeficiency, chronic inflammation)

    Search first: ImmPort, Immunome Database, IEDB, Gene Ontology

  • Tissue Damage Mechanisms: How tissues/ are injured (oxidative stress, ischemia, fibrosis, necrosis)

    Search first: PubMed, Gene Ontology, Reactome

  • Biochemical Abnormalities: Specific molecular defects (enzyme deficiencies, receptor dysfunction, ion channel defects)

    Search first: BRENDA, UniProt, KEGG, OMIM, PubMed

  • Epigenetic Changes: DNA methylation, histone modifications affecting gene expression in disease

    Search first: ENCODE, Roadmap Epigenomics, MethBase, DiseaseMeth

  • Molecular Profiling (if available):
  • Transcriptomics/gene expression changes > Search first: GEO (Gene Expression Omnibus), ArrayExpress, GTEx, Human Cell Atlas, SRA
  • Proteomics findings > Search first: PRIDE, ProteomeXchange, Human Protein Atlas, STRING, BioGRID
  • Metabolomics signatures > Search first: MetaboLights, Metabolomics Workbench, HMDB, METLIN
  • Lipidomics alterations > Search first: LIPID MAPS, SwissLipids, LipidHome, Metabolomics Workbench
  • Genomic structural features > Search first: UCSC Genome Browser, Ensembl, NCBI, dbVar, DGV
  • Advanced Technologies (if applicable):
  • Single-cell analysis findings (cell-type specific mechanisms, cellular heterogeneity) > Search first: Human Cell Atlas, Single Cell Portal, GEO, CELLxGENE
  • Spatial transcriptomics findings > Search first: GEO, Spatial Research, Vizgen, 10x Genomics data
  • Multi-omics integration results > Search first: TCGA, ICGC, cBioPortal, LinkedOmics, PubMed
  • Functional genomics screens (CRISPR, RNAi) > Search first: DepMap, GenomeRNAi, PubMed, BioGRID ORCS

For each mechanism, describe: - The causal chain from initial trigger to clinical manifestation - Which mechanisms are upstream vs downstream - What cell types and biological processes are involved - Suggest GO terms for biological processes and CL terms for cell types

7. Anatomical Structures Affected

  • Organ Level:
  • Primary organs directly affected
  • Secondary organ involvement (complications, secondary effects)
  • Body systems involved (cardiovascular, nervous, digestive, respiratory, endocrine, etc.)

    Search first: Uberon, FMA (Foundational Model of Anatomy), OMIM, HPO, ICD-11, MeSH, SNOMED CT

  • Tissue and Cell Level:
  • Specific tissue types affected (epithelial, connective, muscle, nervous)
  • Specific cell populations targeted (with Cell Ontology terms)

    Search first: Uberon, Human Protein Atlas, Cell Ontology, Human Cell Atlas, CellMarker, PanglaoDB

  • Subcellular Level:
  • Cellular compartments involved (mitochondria, nucleus, ER, lysosomes) (with GO Cellular Component terms)

    Search first: Gene Ontology (Cellular Component), UniProt, Human Protein Atlas

  • Localization:
  • Specific anatomical sites (with UBERON terms) > Search first: FMA, Uberon, NeuroNames (for brain), SNOMED CT
  • Lateralization (unilateral, bilateral, asymmetric) > Search first: HPO, clinical literature, imaging databases

8. Temporal Development

  • Onset:
  • Typical age of onset (congenital, pediatric, adult, geriatric)
  • Onset pattern (acute, subacute, chronic, insidious)

    Search first: OMIM, Orphanet, HPO, PubMed

  • Progression:
  • Disease stages (early, intermediate, advanced, end-stage) > Search first: Cancer Staging Manual (AJCC), WHO classifications, PubMed
  • Progression rate (rapid, slow, variable)
  • Disease course pattern (episodic, relapsing-remitting, progressive, stable)
  • Disease duration (self-limited, chronic lifelong)

    Search first: Disease registries, longitudinal cohort databases, natural history studies, PubMed, Orphanet, OMIM

  • Patterns:
  • Remission patterns (spontaneous, treatment-induced) > Search first: Clinical trial databases, disease registries, PubMed
  • Critical periods (time windows of vulnerability or opportunity for intervention) > Search first: PubMed, developmental biology databases, clinical guidelines

9. Inheritance and Population

  • Epidemiology:
  • Prevalence (cases per 100,000 at given time)
  • Incidence (new cases per 100,000 per year)

    Search first: Orphanet, CDC, WHO, GBD (Global Burden of Disease), national registries, SEER, disease registries

  • For Genetic Etiology:
  • Inheritance pattern (AD, AR, X-linked, mitochondrial, multifactorial, polygenic) > Search first: OMIM, Orphanet, ClinVar, GTR (Genetic Testing Registry)
  • Penetrance (complete, incomplete, age-dependent) > Search first: ClinVar, OMIM, PubMed, ClinGen
  • Expressivity (variable, consistent) > Search first: OMIM, ClinVar, PubMed
  • Genetic anticipation (increasing severity in successive generations) > Search first: OMIM, PubMed (especially for repeat expansion disorders)
  • Germline mosaicism > Search first: ClinVar, OMIM, genetic counseling literature, PubMed
  • Founder effects (population-specific mutations) > Search first: gnomAD, population genetics databases, PubMed
  • Consanguinity role > Search first: OMIM, population studies, genetic counseling resources
  • Carrier frequency > Search first: gnomAD, carrier screening databases, GeneReviews, GTR
  • Population Demographics:
  • Affected populations (ethnic or demographic groups with higher prevalence) > Search first: gnomAD, 1000 Genomes, PAGE Study, PubMed, population registries
  • Geographic distribution (endemic areas, regional variation) > Search first: WHO, CDC, GBD, Orphanet, geographic epidemiology databases
  • Geographic distribution of specific variants
  • Sex ratio (male:female) > Search first: Disease registries, OMIM, PubMed, epidemiological databases
  • Age distribution of affected individuals > Search first: CDC, disease registries, SEER, Orphanet

10. Diagnostics

  • Clinical Tests:
  • Laboratory tests (blood, urine, tissue chemistry, specific enzyme assays) > Search first: LOINC, LabTests Online, PubMed
  • Biomarkers (proteins, metabolites, genetic markers, circulating biomarkers) > Search first: FDA Biomarker List, BEST (Biomarkers, EndpointS, and other Tools), PubMed
  • Imaging studies (X-ray, CT, MRI, PET, ultrasound) > Search first: RadLex, DICOM, Radiopaedia, imaging databases
  • Functional tests (pulmonary function, cardiac stress tests) > Search first: LOINC, clinical guidelines, PubMed
  • Electrophysiology (EEG, EMG, ECG, nerve conduction studies) > Search first: LOINC, clinical neurophysiology databases, PubMed
  • Biopsy findings (histopathology, immunohistochemistry) > Search first: SNOMED CT, College of American Pathologists resources, PubMed
  • Pathology findings (microscopic examination) > Search first: SNOMED CT, Digital Pathology databases, PubMed
  • Genetic Testing:

    Search first: GTR (Genetic Testing Registry), GeneReviews, ClinGen

  • Overview of recommended genetic testing approach
  • Whole genome sequencing (WGS) utility > Search first: GTR, ClinVar, GEL (Genomics England), gnomAD
  • Whole exome sequencing (WES) utility > Search first: GTR, ClinVar, OMIM, GeneMatcher
  • Gene panels (which panels, which genes) > Search first: GTR, ClinVar, laboratory-specific databases
  • Single gene testing > Search first: GTR, ClinVar, OMIM, GeneReviews
  • Chromosomal microarray (CMA) > Search first: DECIPHER, ClinVar, dbVar, ECARUCA
  • Karyotyping > Search first: Chromosome Abnormality Database, ClinVar, cytogenetics resources
  • FISH > Search first: ClinVar, cytogenetics databases, PubMed
  • Mitochondrial DNA testing > Search first: MITOMAP, MSeqDR, ClinVar, GTR
  • Repeat expansion testing > Search first: GTR, ClinVar, repeat expansion databases, PubMed
  • Omics-Based Diagnostics (if applicable):
  • RNA sequencing / transcriptomics > Search first: GEO, ArrayExpress, GTEx, RNA-seq databases
  • Proteomics > Search first: PRIDE, ProteomeXchange, FDA Biomarker database
  • Metabolomics > Search first: MetaboLights, Metabolomics Workbench, HMDB
  • Epigenomics > Search first: GEO, ENCODE, Roadmap Epigenomics, MethBase
  • Liquid biopsy > Search first: COSMIC, ClinVar, liquid biopsy databases, PubMed
  • Clinical Criteria:
  • Standardized diagnostic criteria (DSM, ICD, society guidelines) > Search first: DSM-5, ICD-11, clinical society guidelines, UpToDate
  • Differential diagnosis (other conditions to rule out, with distinguishing features) > Search first: DynaMed, UpToDate, clinical decision support systems
  • Screening:
  • Screening methods for asymptomatic individuals (newborn screening, carrier screening, cascade screening) > Search first: ACMG recommendations, CDC newborn screening, GTR

11. Outcome/Prognosis

  • Survival and Mortality:
  • Survival rate (5-year, 10-year, overall) > Search first: SEER, cancer registries, disease-specific registries, PubMed
  • Life expectancy (with and without treatment if applicable) > Search first: Orphanet, disease registries, actuarial databases, PubMed
  • Mortality rate > Search first: CDC, WHO, GBD, national mortality databases
  • Disease-specific mortality (deaths directly attributable to disease) > Search first: Disease registries, CDC Wonder, GBD, PubMed
  • Morbidity and Function:
  • Morbidity (disease-related disability and health impacts) > Search first: GBD, WHO, disability databases, PubMed
  • Disability outcomes (long-term functional impairments) > Search first: ICF (International Classification of Functioning), disability registries
  • Quality of life measures (EQ-5D, SF-36, PROMIS, disease-specific tools) > Search first: EQ-5D database, SF-36, PROMIS, PubMed
  • Disease Course:
  • Complications (secondary problems: infections, organ failure, etc.) > Search first: ICD codes, disease registries, clinical databases, PubMed
  • Recovery potential (likelihood and extent of recovery, with vs without treatment) > Search first: Natural history studies, rehabilitation databases, PubMed
  • Prediction:
  • Prognostic factors (age, disease severity, biomarkers, treatment response) > Search first: Prognostic models databases, clinical calculators, PubMed
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For each treatment, suggest MAXO (Medical Action Ontology) terms where applicable.

13. Prevention

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    Search first: CDC vaccine schedules, WHO immunization, FDA vaccine database

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    Search first: NSGC resources, ACMG guidelines, GeneReviews

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  • Resources:
  • Model databases > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, IMSR, EMMA, MMRRC

Citation Requirements

  • Cite primary literature (PMID preferred) for all mechanistic and clinical claims
  • Prioritize recent reviews and landmark papers
  • Include direct quotes from abstracts where possible to support key statements
  • Distinguish evidence source types: human clinical, model organism, in vitro, computational

Output Format

Structure your response as a comprehensive narrative organized by the sections above. For each section, provide: - Factual content with specific details (numbers, percentages, gene names, variant nomenclature) - Ontology term suggestions (HPO, GO, CL, UBERON, CHEBI, MAXO, MONDO) where applicable - Evidence citations with PMIDs - Direct quotes from abstracts to support key claims - Clear indication when information is not available or not applicable for this disease

This report will be used to populate a disease knowledge base entry with: - Pathophysiology descriptions with causal chains - Gene/protein annotations (HGNC, GO terms) - Phenotype associations (HP terms) with frequencies - Cell type involvement (CL terms) - Anatomical locations (UBERON terms) - Chemical entities (CHEBI terms) - Treatment annotations (MAXO terms) - Evidence items with PMIDs and exact abstract quotes - Epidemiology, prognosis, diagnostic, and prevention information - Animal model descriptions with phenotype recapitulation details

Comprehensive Disease Characteristics Report: Hereditary Gingival Fibromatosis (HGF)

Target disease: Hereditary Gingival Fibromatosis (HGF)
Category: Mendelian
MONDO ID: Not identified in the retrieved evidence set (limitation).

Executive summary

Hereditary gingival fibromatosis (HGF) is a rare, genetically heterogeneous condition characterized by slowly progressive, benign, fibrous gingival overgrowth that is usually non-hemorrhagic and may be isolated (non-syndromic) or syndromic. Key curated identifiers include ORPHA 2024 and OMIM/MIM 135300. Recent genetic discoveries (2022–2023) expanded beyond classic SOS1/REST to implicate ZNF862 (dominant, pedigree-based) and a digenic ZNF513 + KIF3C mechanism with functional and knock-in mouse support, pointing to convergent profibrotic signaling involving TGF-β/SMAD, Wnt/β-catenin (CTNNB1), Ras/MAPK, and PI3K/AKT/mTOR in gingival fibroblasts. Clinically, management is largely surgical (gingivectomy/gingivoplasty ± flap and osseous resection) plus rigorous plaque control; recurrence is common, particularly in children. (gawron2016gingivalfibromatosisclinical pages 2-3, bayram2017restfinalexontruncatingmutations pages 1-3, wu2022anovelgene pages 2-4, wu2022periodontaldiseaseassociated pages 5-9, shadab2024surgicalmanagementof pages 10-11)

1. Disease information

1.1 What is the disease?

HGF is part of the broader entity “gingival fibromatosis,” defined as slowly progressive local or diffuse gingival enlargements involving marginal/attached gingiva and interdental papillae. The most common form presents as benign, slowly progressive, non-hemorrhagic enlargement of gingiva, often beginning around tooth eruption. (gawron2016gingivalfibromatosisclinical pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3)

HGF may occur as an isolated (non-syndromic) disorder or as part of syndromes (e.g., Jones syndrome; Zimmermann–Laband syndrome; enamel-renal/amelogenesis imperfecta–gingival fibromatosis syndromes), motivating evaluation for systemic features when present. (strzelec2021clinicsandgenetic pages 1-2, strzelec2021clinicsandgenetic pages 2-4, gawron2016gingivalfibromatosisclinical pages 3-4)

1.2 Key identifiers and ontology mappings (available from evidence)

  • Orphanet: ORPHA 2024 (Hereditary gingival fibromatosis) (gawron2016gingivalfibromatosisclinical pages 2-3, gawron2016gingivalfibromatosisclinical media 93678d84)
  • OMIM/MIM: MIM 135300 (HGF / GINGF locus context) (strzelec2021clinicsandgenetic pages 2-4, gawron2016gingivalfibromatosisclinical pages 2-3)

Not found in retrieved full texts (limitation): ICD-10/ICD-11 codes, MeSH descriptor ID, and MONDO ID. This report therefore cannot provide those identifiers with tool-backed citations.

1.3 Synonyms / alternative names

For “gingival fibromatosis” broadly, synonyms include gingivomatosis, gingival enlargement, gingival hyperplasia, gingival overgrowth (GO), elephantiasis gingivae, familial elephantiasis, gigantism of the gingiva, congenital macrogingivae. (gawron2016gingivalfibromatosisclinical pages 1-2)

For HGF specifically, synonyms listed include autosomal dominant gingival fibromatosis, autosomal dominant gingival hyperplasia, and hereditary gingival hyperplasia. (gawron2016gingivalfibromatosisclinical pages 2-3)

1.4 Data source type

The evidence base used here is predominantly aggregated disease-level reviews and family-based genetic studies/case series rather than EHR-scale cohort studies. (gawron2016gingivalfibromatosisclinical pages 2-3, bayram2017restfinalexontruncatingmutations pages 1-3, shadab2024surgicalmanagementof pages 1-2)

2. Etiology

2.1 Disease causal factors

HGF is primarily genetic (Mendelian) with notable locus heterogeneity. Multiple loci for non-syndromic HGF have been mapped across chromosomes 2, 4, 5, and 11, and causal genes include SOS1 and REST in classic loci, with newer evidence for ZNF862 and a digenic ZNF513 + KIF3C model in at least one pedigree. (strzelec2021clinicsandgenetic pages 1-2, chen2023doubleheterozygouspathogenic pages 1-2, wu2022anovelgene pages 2-4, strzelec2021clinicsandgenetic pages 4-6)

2.2 Risk factors

  • Genetic: Autosomal dominant inheritance is most common; autosomal recessive inheritance and sporadic/simplex cases are reported. (strzelec2021clinicsandgenetic pages 2-4, wu2022periodontaldiseaseassociated pages 5-9, bayram2017restfinalexontruncatingmutations pages 1-3)
  • Local/environmental modifiers: Local factors such as plaque and other oral irritants can exacerbate clinical outcomes (especially via pseudopockets and hygiene difficulty), although this represents worsening of disease expression/complications rather than primary causation. (NCT07043985 chunk 1, gawron2016gingivalfibromatosisclinical pages 2-3)

2.3 Protective factors

No protective genetic variants or environmental protective factors were identified in the retrieved evidence set.

2.4 Gene–environment interactions

One review discusses genetic susceptibility in gingival overgrowth and highlights local factors (plaque, calculus, orthodontic appliances, trauma) as exacerbating factors; however, direct gene-by-environment interaction studies specific to HGF were not identified in the retrieved evidence set. (NCT07043985 chunk 1)

3. Phenotypes

HGF phenotypes are summarized in | Phenotype (plain language) | Suggested HPO term(s) | Onset/progression notes | Evidence details (include any numeric thresholds/recurrence) | Key citation IDs | |---|---|---|---|---| | Gingival fibromatosis / gingival enlargement | HP: Gingival overgrowth; HP: Gingival fibromatosis | Usually begins with eruption of primary or permanent teeth; slow, progressive; rarely present at birth | Benign, fibrous, non-hemorrhagic enlargement affecting marginal/attached gingiva and interdental papillae; may cover part or all of tooth crowns; one clinical threshold used in a linkage study was enlargement covering at least one-third of the clinical crowns of 5 or more teeth | (gawron2016gingivalfibromatosisclinical pages 1-2, strzelec2021clinicsandgenetic pages 1-2, pampel2010refinementofthe pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3) | | Non-hemorrhagic, firm, fibrotic gingiva | HP: Abnormality of gingiva; HP: Gingival overgrowth | Chronic/insidious; typically stable-to-progressive rather than episodic | Gingiva described as pale pink, firm, leathery/dense, fibrotic, often nodular, and not bleeding easily; in severe cases may feel hard on palpation | (wu2022periodontaldiseaseassociated pages 5-9, shadab2024surgicalmanagementof pages 1-2) | | Generalized versus localized/nodular overgrowth | HP: Gingival overgrowth | Variable extent; can be diffuse in both jaws, part-diffuse in one jaw, or localized nodular | Reported phenotypes range from localized nodules to generalized enlargement of maxilla and mandible; upper gingiva may predominate in some reports | (strzelec2021clinicsandgenetic pages 1-2, pampel2010refinementofthe pages 1-2, shadab2024surgicalmanagementof pages 6-10) | | Broad/excess keratinized gingiva | HP: Abnormality of gingiva | Often evident in childhood/primary dentition period | Review describes an “extremely wide zone of keratinized gingiva” early in the course; lesions confined to masticatory mucosa and typically do not extend beyond the mucogingival junction | (strzelec2021clinicsandgenetic pages 1-2) | | Pseudopocket formation | HP: Abnormality of gingiva | Develops as tissue enlarges and covers crowns | Excess tissue can create pseudopockets; these predispose to plaque retention, bleeding, and periodontal complications | (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 1-2, shadab2024surgicalmanagementof pages 6-10) | | Plaque accumulation / impaired oral hygiene | HP: Abnormality of the periodontium | Secondary consequence of progressive tissue excess | Pseudopockets create niches for microorganisms and plaque accumulation; daily oral hygiene becomes difficult in severe disease | (wu2022periodontaldiseaseassociated pages 5-9, pampel2010refinementofthe pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3) | | Periodontal complications | HP: Periodontitis; HP: Abnormality of the periodontium | Secondary/downstream manifestation; worsens with poor hygiene and plaque retention | Reported complications include bleeding, periodontal problems, bone loss, and risk of progressive periodontal disease if untreated | (gawron2016gingivalfibromatosisclinical pages 1-2, shadab2024surgicalmanagementof pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3) | | Delayed tooth eruption / retained teeth / impaction | HP: Delayed eruption of teeth; HP: Retained primary teeth; HP: Impacted teeth | Often recognized around tooth eruption; may obstruct eruption of permanent teeth | Reported findings include retention of primary or permanent teeth, delayed eruption, impacted teeth, and permanent teeth lying beneath gingival tissue on radiographs | (gawron2016gingivalfibromatosisclinical pages 1-2, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 1-2, shadab2024surgicalmanagementof pages 6-10) | | Diastema / spaced teeth | HP: Diastema | May emerge with progression as tissue excess displaces teeth | Diastemas and spaced teeth are repeatedly described, especially in more severe generalized disease | (gawron2016gingivalfibromatosisclinical pages 1-2, strzelec2021clinicsandgenetic pages 1-2, gawron2016gingivalfibromatosisclinical pages 4-6) | | Malocclusion / tooth displacement / malposition | HP: Malocclusion; HP: Dental malposition | Progressive; often becomes evident during mixed/permanent dentition | Tooth displacement, malposition, crossbite/open bite, and facial asymmetry may occur due to overgrowth and eruption disturbance | (wu2022periodontaldiseaseassociated pages 5-9, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 6-10) | | Speech difficulty | HP: Dysarthria; HP: Abnormal speech articulation | More common in moderate-severe generalized disease | Review and case-series evidence describe phonetic/articulation difficulties caused by bulky gingiva and altered occlusion | (strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 1-2) | | Mastication/chewing difficulty | HP: Abnormality of chewing; HP: Feeding difficulties | More prominent when crowns are largely covered or teeth eruption is impaired | Patients can have chewing difficulty, impaired occlusion, and functional limitations; surgery often improves masticatory function | (wu2022periodontaldiseaseassociated pages 5-9, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 6-10) | | Psychosocial / aesthetic impact | HP: Psychological distress | Chronic impact that increases with visible overgrowth during childhood/adolescence | Aesthetic concerns, psychosocial effects, and reduced quality of life are commonly described, especially in younger patients | (gawron2016gingivalfibromatosisclinical pages 1-2, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 1-2, afonso2022hereditarygingivalfibromatosis pages 4-4) | | Histopathology: dense collagenized stroma | HP: Abnormal oral mucosa morphology | Structural hallmark rather than temporal feature | Histology shows markedly increased submucosal connective tissue, densely collagenized/cell-poor stroma, excessive ECM/collagen bundles, and relatively few blood vessels | (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 4-6, gawron2016gingivalfibromatosisclinical pages 2-3) | | Histopathology: elongated rete pegs / epithelial hyperplasia | HP: Abnormality of oral epithelium | Persistent microscopic feature | Epithelium is hyperkeratotic/hyperplastic with elongated rete ridges/pegs; pseudoepitheliomatous hyperplasia may occur in severe cases | (pampel2010refinementofthe pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3, wu2022periodontaldiseaseassociated pages 5-9) | | Histopathology: scant inflammation | HP: Abnormal inflammatory response | Usually minimal unless secondary plaque-related inflammation develops | Classic HGF tissue has scant or minimal inflammatory infiltrate; inflammation increases secondarily with plaque retention and pseudopockets | (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 2-3) | | Recurrence after surgery | HP: Recurrent oral soft tissue lesion | Recurrence risk persists long term; higher in children/adolescents | Reported recurrence commonly occurs within 3-10 years after surgery; one 2024 surgical review cites recurrence around 35%; recurrence at 1 year has also been documented, and performing surgery after eruption of permanent teeth may reduce recurrence | (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 4-6, shadab2024surgicalmanagementof pages 10-11, afonso2022hereditarygingivalfibromatosis pages 4-4) |

Table: This table summarizes the core clinical phenotype, diagnostic features, and histopathology of hereditary gingival fibromatosis, with suggested HPO mappings and practical notes on onset, progression, and recurrence. It is useful for structured disease knowledge-base curation and phenotype annotation..

Key clinical manifestations (core phenotype)

  • Gingival overgrowth/fibromatosis that is typically firm, fibrotic, pale pink, and non-hemorrhagic, involving marginal and attached gingiva and interdental papillae. (wu2022periodontaldiseaseassociated pages 5-9, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 1-2)
  • Distribution: can be diffuse/generalized or localized/nodular; confined to masticatory mucosa and typically does not extend beyond mucogingival junction. (strzelec2021clinicsandgenetic pages 1-2, pampel2010refinementofthe pages 1-2)

Dental and functional complications

  • Delayed eruption / retained primary teeth / impaction due to tissue overgrowth covering crowns. (wu2022periodontaldiseaseassociated pages 5-9, shadab2024surgicalmanagementof pages 6-10)
  • Diastemas and tooth displacement/malposition, sometimes leading to malocclusion (including open bite/crossbite). (wu2022periodontaldiseaseassociated pages 5-9, strzelec2021clinicsandgenetic pages 1-2)
  • Speech and mastication difficulties and psychosocial/aesthetic impact, particularly in children/adolescents. (wu2022periodontaldiseaseassociated pages 5-9, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 1-2)

Histopathology (diagnostic phenotype)

Classic features include densely collagenized connective tissue (ECM accumulation), relative paucity of blood vessels and inflammation, and epithelial hyperplasia with elongated rete ridges/pegs. (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 2-3)

Recurrence and natural history

Recurrence after surgery is common; recurrence is often described within 3–10 years and appears more frequent in children/adolescents than adults. (wu2022periodontaldiseaseassociated pages 5-9)

4. Genetic / molecular information

A structured genetics summary is provided in | Entity (disease/locus/gene) | Identifier(s) (ORPHA, OMIM/MIM, locus name) | Inheritance/notes | Key evidence/variant(s) (HGVS where given) | Key mechanism/pathway note | Key citation ID(s) | |---|---|---|---|---|---| | Hereditary gingival fibromatosis (HGF) | ORPHA 2024; MIM 135300; GINGF/HGF | Rare Mendelian gingival overgrowth; usually autosomal dominant, less often autosomal recessive; isolated or syndromic; prevalence estimates in literature include ~1:175,000 and ~1:750,000 depending on phenotype definition/source | Disease-level entity; no single universal causal variant | Core pathology is excessive extracellular matrix accumulation, especially collagen type I; slow progressive fibrotic gingival overgrowth | (gawron2016gingivalfibromatosisclinical pages 2-3, gawron2016gingivalfibromatosisclinical pages 1-2, bayram2017restfinalexontruncatingmutations pages 1-3, wu2022periodontaldiseaseassociated pages 5-9) | | GINGF1 locus | 2p21-p22; OMIM/MIM 135300; GINGF1/GINGF | Typically autosomal dominant non-syndromic HGF locus | Linked to SOS1 exon 21 insertion in one Brazilian family | Ras/MAPK-related signaling implicated through SOS1 activation | (pampel2010refinementofthe pages 1-2, strzelec2021clinicsandgenetic pages 2-4, strzelec2021clinicsandgenetic pages 4-6) | | GINGF2 locus | 5q13-q22; OMIM/MIM 605544; GINGF2 | Autosomal dominant locus; causative gene not firmly established in retrieved evidence; CAMK4 proposed as candidate in reviews | No definitive pathogenic HGVS variant in retrieved evidence | Candidate calcium-signaling contribution; less resolved than SOS1/REST loci | (pampel2010refinementofthe pages 1-2, strzelec2021clinicsandgenetic pages 4-6, gawron2016gingivalfibromatosisclinical media 93678d84) | | GINGF3 locus | 2p23.3-p22.3; OMIM/MIM 609955; GINGF3 | Autosomal dominant locus refined in linkage studies; major locus in some families; later digenic evidence reported within this region | No single classic causal variant from early linkage work; later ZNF513 + KIF3C digenic variants reported | Fibroblast proliferation/fibrosis signaling later tied to PI3K/AKT/mTOR and Ras/Raf/MEK/ERK | (pampel2010refinementofthe pages 1-2, chen2023doubleheterozygouspathogenic pages 1-2, li2023bioinformaticsbasedapproachto pages 12-15) | | GINGF4 locus | 11p15; OMIM/MIM 611010; GINGF4 | Maternally inherited locus reported; gene unresolved in retrieved evidence | No pathogenic HGVS variant retrieved | Suggests additional locus heterogeneity beyond SOS1 and REST | (gawron2016gingivalfibromatosisclinical pages 2-3, li2023bioinformaticsbasedapproachto pages 12-15, strzelec2021clinicsandgenetic pages 4-6) | | GINGF5 locus | 4q12; OMIM/MIM 617626; GINGF5 | Autosomal dominant locus associated with REST | Multiple heterozygous truncating REST alleles identified | Likely altered REST repressor activity with downstream profibrotic/TGF-β effects | (strzelec2021clinicsandgenetic pages 1-2, strzelec2021clinicsandgenetic pages 4-6, strzelec2021clinicsandgenetic pages 6-7) | | SOS1 | MIM 182530; gene at GINGF1 locus | Established causal gene for isolated non-syndromic HGF in a subset of families; autosomal dominant | g.126,142-126,143insC; c.3248-3249insC; chimeric/truncated protein p.K1084fsX1105 | C-terminal truncation removes regulatory domain, producing constitutive/gain-of-function SOS1 activity with increased MAPK signaling; associated with increased fibroblast proliferation and collagen type I synthesis | (strzelec2021clinicsandgenetic pages 2-4, strzelec2021clinicsandgenetic pages 4-6) | | REST | MIM 600571; gene at GINGF5 locus | Established causal gene; autosomal dominant; de novo case and possible parental mosaicism reported | c.2865_2866delAA p.Asn958Serfs9; c.1310T>A p.Leu437; c.2413delC p.Leu805Phefs*38 | Final-exon truncating alleles in transcriptional repressor REST; proposed dominant-negative or neomorphic/gain-of-function-like effect rather than simple haploinsufficiency; linked to increased ECM/collagen and TGF-β dysregulation | (bayram2017restfinalexontruncatingmutations pages 1-3, strzelec2021clinicsandgenetic pages 6-7) | | ZNF862 | Gene on chr7q36.1 | Proposed autosomal dominant HGF gene from a large multigeneration family; not mapped to classic GINGF loci | c.2812G>A; p.A938T; absent from gnomAD/ExAC/1000 Genomes in report | Putative transcriptional regulator; associated with increased COL1A1, TIMP1, TGF-β1 and IL-6 signatures and RNA-seq evidence of TGF-β/SMAD involvement | (wu2022anovelgene pages 1-2, wu2022anovelgene pages 2-4) | | ZNF513 + KIF3C | Reported within GINGF3 locus context | Digenic/combined requirement in one family; double heterozygosity required for phenotype in knock-in mouse model | ZNF513 c.C748T p.R250W + KIF3C c.G1229A p.R410H | ZNF513 positively regulates KIF3C and SOS1; KIF3C variant activates PI3K and KCNQ1; combined effect drives gingival fibroblast proliferation, migration, and fibrosis via PI3K/AKT/mTOR and Ras/Raf/MEK/ERK | (chen2023doubleheterozygouspathogenic pages 1-2) |

Table: This table summarizes the main identifiers, mapped loci, and currently reported genes and variants for hereditary gingival fibromatosis. It highlights locus heterogeneity, established versus emerging gene evidence, and the main profibrotic signaling mechanisms implicated in HGF..

4.1 Causal genes and key pathogenic variants (examples from evidence)

SOS1 (GINGF1 / chr2p21–p22) * A recurrently discussed causal lesion is an exon 21 single-cytosine insertion (e.g., g.126,142-126,143insC; c.3248-3249insC; chimera p.K1084fsX1105), interpreted as producing a truncated SOS1 lacking the C-terminal regulatory domain and described as constitutively activated/gain-of-function with increased MAPK signaling and increased fibroblast proliferation/collagen synthesis. (strzelec2021clinicsandgenetic pages 2-4, strzelec2021clinicsandgenetic pages 4-6)

REST (GINGF5 / chr4q12) * Heterozygous truncating variants identified by exome sequencing include c.2865_2866delAA (p.Asn958Serfs*9), c.1310T>A (p.Leu437*), and c.2413delC (p.Leu805Phefs*38). Proposed mechanisms include dominant-negative or neomorphic effects rather than simple haploinsufficiency, potentially via reduced repressor function and downstream profibrotic signaling (e.g., TGF-β pathway upregulation). (strzelec2021clinicsandgenetic pages 6-7, bayram2017restfinalexontruncatingmutations pages 1-3)

ZNF862 (chr7q36.1; new gene evidence) * A heterozygous missense variant c.2812G>A (p.A938T) co-segregated with autosomal dominant, non-syndromic HGF in a large multi-generation family and was reported absent in population databases in that study. (wu2022anovelgene pages 2-4)

ZNF513 + KIF3C (digenic/combined requirement; 2023) * Double heterozygous variants ZNF513 c.C748T (p.R250W) and KIF3C c.G1229A (p.R410H) were reported to cause HGF in a pedigree. Functional evidence supports that ZNF513 positively regulates KIF3C and SOS1 expression in gingival fibroblasts and that KIF3C p.R410H can activate PI3K and KCNQ1 channels, with downstream PI3K/AKT/mTOR and Ras/Raf/MEK/ERK signaling. (chen2023doubleheterozygouspathogenic pages 1-2)

4.2 Variant classification frameworks

The ZNF862 study explicitly references ACMG/AMP standards for variant interpretation, supporting use of standard clinical variant classification frameworks for HGF molecular diagnostics. (wu2022anovelgene pages 12-13)

4.3 Modifier genes / epigenetics

No validated modifier genes or epigenetic signatures were identified in the retrieved evidence set; several bioinformatics analyses propose networks and candidate genes but require validation. (li2023bioinformaticsbasedapproachto pages 9-12, han2019exomicandtranscriptomic pages 1-2)

5. Environmental information

HGF is primarily genetic. Environmental contributors in the retrieved evidence are largely modifiers of severity/complications, including plaque accumulation, local irritants, and potentially orthodontic appliances (as aggravating local factors). (NCT07043985 chunk 1, gawron2016gingivalfibromatosisclinical pages 2-3)

No infectious etiology is supported in the retrieved evidence.

6. Mechanism / pathophysiology

6.1 Core pathology and causal chain (current understanding)

A convergent model from multiple sources is: 1) Genetic lesion (e.g., SOS1 GOF truncation; REST truncation; ZNF862 variant; ZNF513+KIF3C digenic variants) (strzelec2021clinicsandgenetic pages 4-6, strzelec2021clinicsandgenetic pages 6-7, wu2022anovelgene pages 2-4, chen2023doubleheterozygouspathogenic pages 1-2) 2) Perturbed profibrotic signaling in gingival tissues—prominent pathways include: * TGF-β1 → SMAD-dependent and SMAD-independent pathways (including β-catenin), driving fibroblast activation and ECM synthesis (gao2019antifibroticpotentialof pages 2-3) * Wnt/β-catenin (CTNNB1) as a co-required axis for TGF-β1-mediated fibrosis (gao2019antifibroticpotentialof pages 2-3) * Ras/MAPK (SOS1 as Ras GEF) and, in the digenic model, explicit Ras/Raf/MEK/ERK signaling (strzelec2021clinicsandgenetic pages 4-6, chen2023doubleheterozygouspathogenic pages 1-2) * PI3K/AKT/mTOR (explicit in ZNF513+KIF3C mechanism) (chen2023doubleheterozygouspathogenic pages 1-2) 3) Cellular effector: gingival fibroblast proliferation/migration and fibrogenic activity leading to excess ECM accumulation (collagen I and fibronectin among key markers) (chen2023doubleheterozygouspathogenic pages 1-2, gawron2016gingivalfibromatosisclinical pages 1-2) 4) Tissue-level manifestation: thick, fibrotic gingiva (pseudopockets, delayed eruption, malocclusion, hygiene difficulty), with secondary inflammation/periodontal disease risk due to plaque retention. (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 2-3)

6.2 Key cell types and ontology suggestions

  • Cell Ontology (CL) suggestions: gingival fibroblast (primary effector cell type in multiple mechanistic studies), keratinocytes (mentioned in epithelial–mesenchymal transition hypotheses for drug-induced gingival overgrowth; relevance to HGF itself is less directly evidenced in the retrieved mechanistic text). (gawron2016gingivalfibromatosisclinical pages 1-2, gao2019antifibroticpotentialof pages 2-3)

6.3 Tissue/anatomy ontology suggestions

  • UBERON suggestions: gingiva (marginal/attached gingiva, interdental papillae), oral mucosa/masticatory mucosa. (strzelec2021clinicsandgenetic pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3)

6.4 Molecular profiling and omics evidence

  • miRNA/functional genomics: A mechanistic study nominated miR-335-3p as an antifibrotic candidate; it is reported downregulated in HGF gingival fibroblasts and to directly target SOS1, SMAD2/3, and CTNNB1, reducing fibrogenic activity when ectopically expressed. (gao2019antifibroticpotentialof pages 1-2)
  • Transcriptomics: The ZNF862 study reports RNA-seq of primary gingival fibroblasts from patients vs controls and implicates the TGF-β/SMAD regulatory network and collagen/ECM dysregulation. (wu2022anovelgene pages 2-4, wu2022anovelgene pages 10-12)
  • Bioinformatics (hypothesis-generating): A ceRNA network analysis (preprint) identified candidate hub genes (e.g., IL6) and noncoding regulators potentially linking HGF and periodontitis; it explicitly cautions about small HGF sample size (e.g., GSE4250 with n=4). (li2023bioinformaticsbasedapproachto pages 4-7, li2023bioinformaticsbasedapproachto pages 9-12)

Direct abstract quote examples (as available in evidence excerpts): * Bayram et al. (2017) title itself provides a concise claim: “REST Final-Exon-Truncating Mutations Cause Hereditary Gingival Fibromatosis.” (bayram2017restfinalexontruncatingmutations pages 1-3)

7. Anatomical structures affected

Organ/tissue level

Primary affected tissue is gingiva (masticatory mucosa), including marginal and attached gingiva and interdental papillae. (strzelec2021clinicsandgenetic pages 1-2)

Tissue and cell level

Connective tissue compartment is prominently involved (dense collagenized stroma) with gingival fibroblasts as key effector cells. (gawron2016gingivalfibromatosisclinical pages 2-3, gao2019antifibroticpotentialof pages 2-3)

Subcellular/ECM

Extracellular matrix accumulation (collagen type I as a prominent component) is a hallmark. (gawron2016gingivalfibromatosisclinical pages 1-2)

8. Temporal development

  • Onset: most often coincides with eruption of primary or permanent dentition; rarely at birth. (gawron2016gingivalfibromatosisclinical pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3)
  • Course: slowly progressive and chronic; severity varies across individuals and families. (strzelec2021clinicsandgenetic pages 1-2)
  • Recurrence: following surgery commonly within 3–10 years; children/adolescents show higher recurrence risk. (wu2022periodontaldiseaseassociated pages 5-9)

9. Inheritance and population

9.1 Epidemiology and demographics

Across multiple sources, HGF is described as rare with unknown prevalence in many contexts, but several estimates are reported: * Incidence estimates reported include ~1:175,000 by phenotype and ~1:350,000 by genotype, with equal sex distribution. (wu2022periodontaldiseaseassociated pages 5-9) * A separate 2024 surgical case series cites prevalence of ~1 in 175,000 and also notes equal sex distribution. (shadab2024surgicalmanagementof pages 1-2) * A genetics paper similarly states an estimated frequency 1:175,000 and that it “equally affect[s] males and females.” (bayram2017restfinalexontruncatingmutations pages 1-3)

Geographic distribution / population-specific variants: not systematically reported in the retrieved evidence; multiple pedigrees reported from diverse populations (e.g., Chinese family for ZNF862), but no founder-effect statistics are provided. (wu2022anovelgene pages 2-4)

9.2 Inheritance

Autosomal dominant is typical; autosomal recessive and simplex cases occur. (strzelec2021clinicsandgenetic pages 2-4, bayram2017restfinalexontruncatingmutations pages 1-3)

Penetrance/expressivity are variable (clinical severity varies within families), but quantitative penetrance was not extractable from retrieved texts. (strzelec2021clinicsandgenetic pages 1-2)

10. Diagnostics

10.1 Clinical diagnosis and differential

Diagnosis is largely clinical, supported by family history, and requires exclusion of drug-induced gingival overgrowth and syndromic/systemic causes. Key medication differentials include phenytoin, cyclosporine, and calcium channel blockers. (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 1-2)

Drug-induced gingival overgrowth has reported high incidences for certain drugs (e.g., phenytoin up to 70%; nifedipine 15–83%; cyclosporine A 8–70%), underlining the importance of medication history. (gawron2016gingivalfibromatosisclinical pages 2-3)

If a syndromic presentation is suspected, referral to a geneticist for additional examination and specialized tests is recommended. (gawron2016gingivalfibromatosisclinical pages 1-2)

10.2 Histopathology

Characteristic histology includes epithelial hyperplasia with elongated rete ridges, with underlying dense collagenous connective tissue, low vascularity, and minimal inflammation (unless secondary plaque-related inflammation occurs). (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 2-3)

10.3 Genetic testing approaches (evidence-informed)

The retrieved evidence supports a pragmatic, heterogeneity-aware approach: * Targeted testing can be considered when a clear familial non-syndromic presentation suggests classic genes (SOS1, REST), although heterogeneity is substantial. (strzelec2021clinicsandgenetic pages 4-6, strzelec2021clinicsandgenetic pages 6-7) * Whole-exome sequencing (WES) has been pivotal to discovery of REST truncations and ZNF862 in families, supporting WES when targeted testing is negative or when syndromic/atypical features exist. (strzelec2021clinicsandgenetic pages 6-7, wu2022periodontaldiseaseassociated pages 5-9) * Variant confirmation: exome/genome indels should be confirmed by orthogonal methods (e.g., Sanger) due to indel-calling challenges. (strzelec2021clinicsandgenetic pages 6-7)

Evidence gap: explicit stepwise clinical testing guidelines (e.g., panel contents, WGS utility statements, formal society recommendations) were not present in the retrieved set.

10.4 ClinicalTrials.gov evidence relevant to diagnostics

  • NCT00104026 (NIDCR; observational; posted 2005-02-21; completed 2011-04-19) studied genes associated with hereditary and drug-induced gingival overgrowth, including clinical exam, radiographs, blood/DNA extraction, with optional biopsy or gingivectomy. URL: https://clinicaltrials.gov/study/NCT00104026 (NCT00104026 chunk 1)

11. Outcome / prognosis

HGF is benign but can significantly impair function and quality of life (speech, mastication, aesthetics) and complicate oral hygiene, increasing risk of periodontal complications. Recurrence after surgical treatment is common, and long-term follow-up is recommended. (wu2022periodontaldiseaseassociated pages 5-9, shadab2024surgicalmanagementof pages 10-11)

No mortality signal or survival statistics were identified in the retrieved evidence.

12. Treatment

12.1 Current applications and real-world implementations

Treatment is primarily procedural with supportive periodontal care: * Supportive periodontal therapy / plaque control: fundamental; 3‑month maintenance intervals suggested for mild disease. (wu2022periodontaldiseaseassociated pages 5-9) * Surgical reduction: gingivectomy/gingivoplasty (scalpel), flap surgery (apically positioned flap; split-thickness flaps), and in severe cases osseous resection (osteoplasty/osteotomy/ostectomy) and occasional extractions. (shadab2024surgicalmanagementof pages 10-11, wu2022periodontaldiseaseassociated pages 5-9) * Laser/electrosurgery: CO2/diode lasers and electrosurgery reported as useful alternatives with reduced bleeding and discomfort; scalpel surgery remains effective when technology limited. (shadab2024surgicalmanagementof pages 10-11, wu2022periodontaldiseaseassociated pages 5-9) * Adjunctive topical antisepsis: chlorhexidine mouthwash is used postoperatively in some protocols (e.g., 0.2% for 2 weeks in one case series; 10 ml twice daily for 10 days in a gingival fibromatosis case report). (shadab2024surgicalmanagementof pages 10-11, abiraami2024idiopathicgingivalfibromatosis pages 2-6) * Downstream care: orthodontic/prosthetic/implant planning after gingival reduction is commonly required in practice; some case series explicitly note surgery creates favorable conditions for orthodontic/implant/prosthetic treatment. (shadab2024surgicalmanagementof pages 1-2, shadab2024surgicalmanagementof pages 6-10)

12.2 Treatment outcomes and recurrence statistics

  • A 2024 case series reports a recurrence rate around ~35%, influenced by age, technique, location, genetics, and oral hygiene; recurrence timing ranges from months to years. (shadab2024surgicalmanagementof pages 10-11)
  • Recurrence windows of 3–10 years after surgery are reported, with greater recurrence risk in children/adolescents. (wu2022periodontaldiseaseassociated pages 5-9)
  • Performing surgery after eruption of permanent teeth may reduce recurrence, and both short- and long-term follow-up are recommended. (afonso2022hereditarygingivalfibromatosis pages 2-4)

12.3 Experimental/clinical trials

  • NCT07043985 (Badr University; interventional; completed; first posted 2025-06-29; primary completion 2024-11-05) is a histopathological study comparing vitamin C injection–induced tissue modification to fibrotic non-syndromic HGF, including semi-quantitative collagen/connective tissue measures. URL: https://clinicaltrials.gov/study/NCT07043985 (NCT07043985 chunk 1)

12.4 MAXO (Medical Action Ontology) term suggestions

  • Gingivectomy; Gingivoplasty; Periodontal flap surgery (apically positioned flap); Osteoplasty/Osteotomy/Ostectomy; Tooth extraction; Laser ablation; Electrosurgery; Supportive periodontal therapy; Oral hygiene instruction; Chlorhexidine mouth rinse; Genetic counseling/referral (if syndromic suspicion). (shadab2024surgicalmanagementof pages 10-11, wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 1-2)

13. Prevention

Primary prevention of genetically determined HGF is not established; however, secondary/tertiary prevention focuses on: * Early recognition and exclusion of drug-induced gingival overgrowth through medication history. (gawron2016gingivalfibromatosisclinical pages 1-2) * Plaque control and supportive periodontal therapy to reduce secondary inflammation/periodontitis risk and potentially reduce recurrence severity. (wu2022periodontaldiseaseassociated pages 5-9) * Genetic counseling / family cascade evaluation is implied by familial inheritance and referral to genetics when syndromic disease suspected. (gawron2016gingivalfibromatosisclinical pages 1-2)

14. Other species / natural disease

No naturally occurring non-human hereditary gingival fibromatosis examples were identified in the retrieved evidence set.

15. Model organisms

A key recent development is an engineered mouse model: * Knock-in mice carrying orthologous variants showed that single Zfp513 or Kif3c variants alone did not produce clear gingival phenotypes, while combined (double) mutations produced gingival hyperplasia, supporting a digenic/interaction model for that pedigree. (chen2023doubleheterozygouspathogenic pages 1-2)

An earlier study noted a lack of established animal models historically, motivating computational cross-validation strategies. (han2019exomicandtranscriptomic pages 1-2)

Recent developments (prioritizing 2023–2024)

1) Digenic genetic mechanism with functional validation (2023): ZNF513 p.R250W + KIF3C p.R410H double heterozygosity with pathway-level mechanistic links (PI3K/AKT/mTOR; Ras/Raf/MEK/ERK) and knock-in mouse support. (chen2023doubleheterozygouspathogenic pages 1-2) 2) Real-world surgical management updates (2024): contemporary case series detailing combined periodontal plastic surgery + osseous resection workflows, postoperative care, and recurrence determinants, including a cited ~35% recurrence estimate. (shadab2024surgicalmanagementof pages 10-11)

Expert opinions / authoritative analysis

High-citation rare-disease review articles emphasize: * Diagnostic reliance on clinical phenotype plus histopathology; early diagnosis to exclude malignancy; and the need to rule out drug-induced gingival overgrowth. (gawron2016gingivalfibromatosisclinical pages 1-2) * Genetic heterogeneity (SOS1 plus additional genes likely) and a management approach ranging from scaling in mild cases to surgery in severe disease, with recurrence risk. (gawron2016gingivalfibromatosisclinical pages 1-2)

Key statistics extracted from recent/authoritative sources

  • Incidence/frequency estimates: 1:175,000 (phenotype) and 1:350,000 (genotype) reported in an authoritative chapter-style review; equal sex distribution. (wu2022periodontaldiseaseassociated pages 5-9)
  • Recurrence: observed within 3–10 years; higher risk in children/adolescents. (wu2022periodontaldiseaseassociated pages 5-9)
  • Surgical recurrence estimate: ~35% cited in a 2024 surgical case series review. (shadab2024surgicalmanagementof pages 10-11)

Embedded evidence artifacts

Entity (disease/locus/gene) Identifier(s) (ORPHA, OMIM/MIM, locus name) Inheritance/notes Key evidence/variant(s) (HGVS where given) Key mechanism/pathway note Key citation ID(s)
Hereditary gingival fibromatosis (HGF) ORPHA 2024; MIM 135300; GINGF/HGF Rare Mendelian gingival overgrowth; usually autosomal dominant, less often autosomal recessive; isolated or syndromic; prevalence estimates in literature include ~1:175,000 and ~1:750,000 depending on phenotype definition/source Disease-level entity; no single universal causal variant Core pathology is excessive extracellular matrix accumulation, especially collagen type I; slow progressive fibrotic gingival overgrowth (gawron2016gingivalfibromatosisclinical pages 2-3, gawron2016gingivalfibromatosisclinical pages 1-2, bayram2017restfinalexontruncatingmutations pages 1-3, wu2022periodontaldiseaseassociated pages 5-9)
GINGF1 locus 2p21-p22; OMIM/MIM 135300; GINGF1/GINGF Typically autosomal dominant non-syndromic HGF locus Linked to SOS1 exon 21 insertion in one Brazilian family Ras/MAPK-related signaling implicated through SOS1 activation (pampel2010refinementofthe pages 1-2, strzelec2021clinicsandgenetic pages 2-4, strzelec2021clinicsandgenetic pages 4-6)
GINGF2 locus 5q13-q22; OMIM/MIM 605544; GINGF2 Autosomal dominant locus; causative gene not firmly established in retrieved evidence; CAMK4 proposed as candidate in reviews No definitive pathogenic HGVS variant in retrieved evidence Candidate calcium-signaling contribution; less resolved than SOS1/REST loci (pampel2010refinementofthe pages 1-2, strzelec2021clinicsandgenetic pages 4-6, gawron2016gingivalfibromatosisclinical media 93678d84)
GINGF3 locus 2p23.3-p22.3; OMIM/MIM 609955; GINGF3 Autosomal dominant locus refined in linkage studies; major locus in some families; later digenic evidence reported within this region No single classic causal variant from early linkage work; later ZNF513 + KIF3C digenic variants reported Fibroblast proliferation/fibrosis signaling later tied to PI3K/AKT/mTOR and Ras/Raf/MEK/ERK (pampel2010refinementofthe pages 1-2, chen2023doubleheterozygouspathogenic pages 1-2, li2023bioinformaticsbasedapproachto pages 12-15)
GINGF4 locus 11p15; OMIM/MIM 611010; GINGF4 Maternally inherited locus reported; gene unresolved in retrieved evidence No pathogenic HGVS variant retrieved Suggests additional locus heterogeneity beyond SOS1 and REST (gawron2016gingivalfibromatosisclinical pages 2-3, li2023bioinformaticsbasedapproachto pages 12-15, strzelec2021clinicsandgenetic pages 4-6)
GINGF5 locus 4q12; OMIM/MIM 617626; GINGF5 Autosomal dominant locus associated with REST Multiple heterozygous truncating REST alleles identified Likely altered REST repressor activity with downstream profibrotic/TGF-β effects (strzelec2021clinicsandgenetic pages 1-2, strzelec2021clinicsandgenetic pages 4-6, strzelec2021clinicsandgenetic pages 6-7)
SOS1 MIM 182530; gene at GINGF1 locus Established causal gene for isolated non-syndromic HGF in a subset of families; autosomal dominant g.126,142-126,143insC; c.3248-3249insC; chimeric/truncated protein p.K1084fsX1105 C-terminal truncation removes regulatory domain, producing constitutive/gain-of-function SOS1 activity with increased MAPK signaling; associated with increased fibroblast proliferation and collagen type I synthesis (strzelec2021clinicsandgenetic pages 2-4, strzelec2021clinicsandgenetic pages 4-6)
REST MIM 600571; gene at GINGF5 locus Established causal gene; autosomal dominant; de novo case and possible parental mosaicism reported c.2865_2866delAA p.Asn958Serfs9; c.1310T>A p.Leu437; c.2413delC p.Leu805Phefs*38 Final-exon truncating alleles in transcriptional repressor REST; proposed dominant-negative or neomorphic/gain-of-function-like effect rather than simple haploinsufficiency; linked to increased ECM/collagen and TGF-β dysregulation (bayram2017restfinalexontruncatingmutations pages 1-3, strzelec2021clinicsandgenetic pages 6-7)
ZNF862 Gene on chr7q36.1 Proposed autosomal dominant HGF gene from a large multigeneration family; not mapped to classic GINGF loci c.2812G>A; p.A938T; absent from gnomAD/ExAC/1000 Genomes in report Putative transcriptional regulator; associated with increased COL1A1, TIMP1, TGF-β1 and IL-6 signatures and RNA-seq evidence of TGF-β/SMAD involvement (wu2022anovelgene pages 1-2, wu2022anovelgene pages 2-4)
ZNF513 + KIF3C Reported within GINGF3 locus context Digenic/combined requirement in one family; double heterozygosity required for phenotype in knock-in mouse model ZNF513 c.C748T p.R250W + KIF3C c.G1229A p.R410H ZNF513 positively regulates KIF3C and SOS1; KIF3C variant activates PI3K and KCNQ1; combined effect drives gingival fibroblast proliferation, migration, and fibrosis via PI3K/AKT/mTOR and Ras/Raf/MEK/ERK (chen2023doubleheterozygouspathogenic pages 1-2)

Table: This table summarizes the main identifiers, mapped loci, and currently reported genes and variants for hereditary gingival fibromatosis. It highlights locus heterogeneity, established versus emerging gene evidence, and the main profibrotic signaling mechanisms implicated in HGF.

Phenotype (plain language) Suggested HPO term(s) Onset/progression notes Evidence details (include any numeric thresholds/recurrence) Key citation IDs
Gingival fibromatosis / gingival enlargement HP: Gingival overgrowth; HP: Gingival fibromatosis Usually begins with eruption of primary or permanent teeth; slow, progressive; rarely present at birth Benign, fibrous, non-hemorrhagic enlargement affecting marginal/attached gingiva and interdental papillae; may cover part or all of tooth crowns; one clinical threshold used in a linkage study was enlargement covering at least one-third of the clinical crowns of 5 or more teeth (gawron2016gingivalfibromatosisclinical pages 1-2, strzelec2021clinicsandgenetic pages 1-2, pampel2010refinementofthe pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3)
Non-hemorrhagic, firm, fibrotic gingiva HP: Abnormality of gingiva; HP: Gingival overgrowth Chronic/insidious; typically stable-to-progressive rather than episodic Gingiva described as pale pink, firm, leathery/dense, fibrotic, often nodular, and not bleeding easily; in severe cases may feel hard on palpation (wu2022periodontaldiseaseassociated pages 5-9, shadab2024surgicalmanagementof pages 1-2)
Generalized versus localized/nodular overgrowth HP: Gingival overgrowth Variable extent; can be diffuse in both jaws, part-diffuse in one jaw, or localized nodular Reported phenotypes range from localized nodules to generalized enlargement of maxilla and mandible; upper gingiva may predominate in some reports (strzelec2021clinicsandgenetic pages 1-2, pampel2010refinementofthe pages 1-2, shadab2024surgicalmanagementof pages 6-10)
Broad/excess keratinized gingiva HP: Abnormality of gingiva Often evident in childhood/primary dentition period Review describes an “extremely wide zone of keratinized gingiva” early in the course; lesions confined to masticatory mucosa and typically do not extend beyond the mucogingival junction (strzelec2021clinicsandgenetic pages 1-2)
Pseudopocket formation HP: Abnormality of gingiva Develops as tissue enlarges and covers crowns Excess tissue can create pseudopockets; these predispose to plaque retention, bleeding, and periodontal complications (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 1-2, shadab2024surgicalmanagementof pages 6-10)
Plaque accumulation / impaired oral hygiene HP: Abnormality of the periodontium Secondary consequence of progressive tissue excess Pseudopockets create niches for microorganisms and plaque accumulation; daily oral hygiene becomes difficult in severe disease (wu2022periodontaldiseaseassociated pages 5-9, pampel2010refinementofthe pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3)
Periodontal complications HP: Periodontitis; HP: Abnormality of the periodontium Secondary/downstream manifestation; worsens with poor hygiene and plaque retention Reported complications include bleeding, periodontal problems, bone loss, and risk of progressive periodontal disease if untreated (gawron2016gingivalfibromatosisclinical pages 1-2, shadab2024surgicalmanagementof pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3)
Delayed tooth eruption / retained teeth / impaction HP: Delayed eruption of teeth; HP: Retained primary teeth; HP: Impacted teeth Often recognized around tooth eruption; may obstruct eruption of permanent teeth Reported findings include retention of primary or permanent teeth, delayed eruption, impacted teeth, and permanent teeth lying beneath gingival tissue on radiographs (gawron2016gingivalfibromatosisclinical pages 1-2, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 1-2, shadab2024surgicalmanagementof pages 6-10)
Diastema / spaced teeth HP: Diastema May emerge with progression as tissue excess displaces teeth Diastemas and spaced teeth are repeatedly described, especially in more severe generalized disease (gawron2016gingivalfibromatosisclinical pages 1-2, strzelec2021clinicsandgenetic pages 1-2, gawron2016gingivalfibromatosisclinical pages 4-6)
Malocclusion / tooth displacement / malposition HP: Malocclusion; HP: Dental malposition Progressive; often becomes evident during mixed/permanent dentition Tooth displacement, malposition, crossbite/open bite, and facial asymmetry may occur due to overgrowth and eruption disturbance (wu2022periodontaldiseaseassociated pages 5-9, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 6-10)
Speech difficulty HP: Dysarthria; HP: Abnormal speech articulation More common in moderate-severe generalized disease Review and case-series evidence describe phonetic/articulation difficulties caused by bulky gingiva and altered occlusion (strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 1-2)
Mastication/chewing difficulty HP: Abnormality of chewing; HP: Feeding difficulties More prominent when crowns are largely covered or teeth eruption is impaired Patients can have chewing difficulty, impaired occlusion, and functional limitations; surgery often improves masticatory function (wu2022periodontaldiseaseassociated pages 5-9, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 6-10)
Psychosocial / aesthetic impact HP: Psychological distress Chronic impact that increases with visible overgrowth during childhood/adolescence Aesthetic concerns, psychosocial effects, and reduced quality of life are commonly described, especially in younger patients (gawron2016gingivalfibromatosisclinical pages 1-2, strzelec2021clinicsandgenetic pages 1-2, shadab2024surgicalmanagementof pages 1-2, afonso2022hereditarygingivalfibromatosis pages 4-4)
Histopathology: dense collagenized stroma HP: Abnormal oral mucosa morphology Structural hallmark rather than temporal feature Histology shows markedly increased submucosal connective tissue, densely collagenized/cell-poor stroma, excessive ECM/collagen bundles, and relatively few blood vessels (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 4-6, gawron2016gingivalfibromatosisclinical pages 2-3)
Histopathology: elongated rete pegs / epithelial hyperplasia HP: Abnormality of oral epithelium Persistent microscopic feature Epithelium is hyperkeratotic/hyperplastic with elongated rete ridges/pegs; pseudoepitheliomatous hyperplasia may occur in severe cases (pampel2010refinementofthe pages 1-2, gawron2016gingivalfibromatosisclinical pages 2-3, wu2022periodontaldiseaseassociated pages 5-9)
Histopathology: scant inflammation HP: Abnormal inflammatory response Usually minimal unless secondary plaque-related inflammation develops Classic HGF tissue has scant or minimal inflammatory infiltrate; inflammation increases secondarily with plaque retention and pseudopockets (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 2-3)
Recurrence after surgery HP: Recurrent oral soft tissue lesion Recurrence risk persists long term; higher in children/adolescents Reported recurrence commonly occurs within 3-10 years after surgery; one 2024 surgical review cites recurrence around 35%; recurrence at 1 year has also been documented, and performing surgery after eruption of permanent teeth may reduce recurrence (wu2022periodontaldiseaseassociated pages 5-9, gawron2016gingivalfibromatosisclinical pages 4-6, shadab2024surgicalmanagementof pages 10-11, afonso2022hereditarygingivalfibromatosis pages 4-4)

Table: This table summarizes the core clinical phenotype, diagnostic features, and histopathology of hereditary gingival fibromatosis, with suggested HPO mappings and practical notes on onset, progression, and recurrence. It is useful for structured disease knowledge-base curation and phenotype annotation.

Evidence limitations (important for knowledge-base curation)

1) ICD-10/ICD-11, MeSH, and MONDO identifiers were not captured in the retrieved full-text evidence and therefore are not provided with tool-backed citations. 2) Quantitative penetrance, carrier frequency, population founder effects, and robust prevalence/incidence estimates from epidemiologic registries were not available in the retrieved evidence set; frequency numbers reported are secondary-source estimates. 3) Some bioinformatics studies are preprints and explicitly note small HGF sample sizes; these should be treated as hypothesis-generating. (li2023bioinformaticsbasedapproachto pages 9-12)

References

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  2. (bayram2017restfinalexontruncatingmutations pages 1-3): Yavuz Bayram, Janson J. White, Nursel Elcioglu, Megan T. Cho, Neda Zadeh, Asuman Gedikbasi, Sukru Palanduz, Sukru Ozturk, Kivanc Cefle, Ozgur Kasapcopur, Zeynep Coban Akdemir, Davut Pehlivan, Amber Begtrup, Claudia M.B. Carvalho, Ingrid Sophie Paine, Ali Mentes, Kivanc Bektas-Kayhan, Ender Karaca, Shalini N. Jhangiani, Donna M. Muzny, Richard A. Gibbs, and James R. Lupski. Rest final-exon-truncating mutations cause hereditary gingival fibromatosis. American journal of human genetics, 101 1:149-156, Jul 2017. URL: https://doi.org/10.1016/j.ajhg.2017.06.006, doi:10.1016/j.ajhg.2017.06.006. This article has 64 citations and is from a highest quality peer-reviewed journal.

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