Hand-foot-genital syndrome (HFGS) is an autosomal dominant, fully penetrant disorder caused by mutations in HOXA13, a homeobox transcription factor critical for distal limb and Mullerian duct development. It is characterized by short first metacarpals, small distal phalanges of the thumbs, short middle phalanges of the fifth fingers, short great toes, and Mullerian duct fusion defects (bicornuate or didelphic uterus) in females. Males may have hypospadias. HFGS was the second human syndrome shown to be caused by a HOX gene mutation.
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name: Hand-Foot-Genital Syndrome
creation_date: '2026-02-13T00:31:42Z'
updated_date: '2026-05-09T04:07:20Z'
category: Mendelian
description: >
Hand-foot-genital syndrome (HFGS) is an autosomal dominant, fully penetrant
disorder caused by mutations in HOXA13, a homeobox transcription factor critical
for distal limb and Mullerian duct development. It is characterized by short first
metacarpals, small distal phalanges of the thumbs, short middle phalanges of the
fifth fingers, short great toes, and Mullerian duct fusion defects (bicornuate or
didelphic uterus) in females. Males may have hypospadias. HFGS was the second
human syndrome shown to be caused by a HOX gene mutation.
disease_term:
preferred_term: hand-foot-genital syndrome
term:
id: MONDO:0007698
label: hand-foot-genital syndrome
parents:
- Limb Development Disorders
inheritance:
- name: Autosomal Dominant
description: >
Autosomal dominant with full penetrance but variable expressivity.
Multiple mutation types including nonsense mutations, polyalanine
tract expansions, and missense mutations in the homeodomain.
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "hand-foot-genital (HFG) syndrome is an autosomal dominant, fully penetrant disorder"
explanation: "Establishes HFGS as autosomal dominant with full penetrance."
prevalence:
- population: Published HFGS families
percentage: Unknown
notes: >-
Population prevalence is not established; recent review literature notes
only twenty reported families, consistent with an exceptionally rare
autosomal dominant syndrome.
evidence:
- reference: PMID:36702441
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "BACKGROUND: Hand-Foot-Genital Syndrome (HFGS) is an autosomal dominant disorder characterized by a broad phenotypic spectrum. Variants in HOXA13 gene were associated with HFGS. To date, only twenty families with HFGS have been reported."
explanation: Recent review abstract indicates that only a small number of families have been reported worldwide.
pathophysiology:
- name: Distal Limb Morphogenesis Disruption
description: >
HOXA13 is a homeobox transcription factor that patterns distal limb
structures. Loss-of-function mutations (nonsense, missense, or
polyalanine expansions) disrupt DNA binding or protein function,
leading to abnormal morphogenesis of distal metacarpals, phalanges,
and metatarsals. Multiple mutation mechanisms act through different
pathways, and mutations can produce more severe limb phenotypes
than initially recognized.
biological_processes:
- preferred_term: Embryonic Limb Morphogenesis
term:
id: GO:0030326
label: embryonic limb morphogenesis
- preferred_term: Regionalization
term:
id: GO:0003002
label: regionalization
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "the identification of a HOXA13 nonsense mutation in a family with hand-foot-genital syndrome"
explanation: "Identifies HOXA13 as the causative gene for HFGS."
- reference: PMID:10839976
reference_title: "Novel HOXA13 mutations and the phenotypic spectrum of hand-foot-genital syndrome."
supports: SUPPORT
snippet: "Mutations in HOXA13 can therefore cause more-severe limb abnormalities than previously suspected and may act by more than one mechanism"
explanation: "Demonstrates wider severity spectrum than initially recognized, through multiple pathogenic mechanisms."
- reference: PMID:10839976
reference_title: "Novel HOXA13 mutations and the phenotypic spectrum of hand-foot-genital syndrome."
supports: SUPPORT
snippet: "nonsense mutations truncating the encoded protein N-terminal to or within the homeodomain produce typical limb and genitourinary abnormalities"
explanation: "Establishes that truncating mutations in the homeodomain cause the typical HFGS phenotype."
- name: Mullerian Duct Fusion Defect
description: >
HOXA13 is also required for Mullerian duct fusion during female
reproductive tract development. Loss-of-function mutations lead
to incomplete fusion, resulting in bicornuate or didelphic uterus
in affected females. In males, the same developmental program
underlies hypospadias.
biological_processes:
- preferred_term: Uterus Development
term:
id: GO:0060065
label: uterus development
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "the identification of a HOXA13 nonsense mutation in a family with hand-foot-genital syndrome"
explanation: "HOXA13 mutations underlie both limb and genitourinary features of HFGS."
phenotypes:
- name: Short First Metacarpal
description: >
Shortened first metacarpals of normal thickness, a hallmark hand
anomaly distinguishing HFGS from other brachydactyly syndromes.
phenotype_term:
preferred_term: Short metacarpal
term:
id: HP:0010049
label: Short metacarpal
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "Limb anomalies include short first metacarpals of normal thickness, small distal phalanges of the thumbs, short middle phalanges of the fifth fingers"
explanation: "Short first metacarpals are a cardinal hand feature of HFGS."
- name: Short Thumb
description: >
Small distal phalanges of the thumbs, contributing to overall
thumb shortening.
phenotype_term:
preferred_term: Short thumb
term:
id: HP:0009778
label: Short thumb
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "small distal phalanges of the thumbs"
explanation: "Small distal phalanges of the thumbs are a typical hand feature."
- name: Short Hallux
description: >
Shortened great toe due to a short first metatarsal and small,
pointed distal phalanx. This is the characteristic foot anomaly.
phenotype_term:
preferred_term: Short hallux
term:
id: HP:0010109
label: Short hallux
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "the great toe is shorter due to a short first metatarsal and a small, pointed distal phalanx"
explanation: "Short great toe from short first metatarsal is the hallmark foot feature."
- name: Bicornuate Uterus
description: >
Partially divided (bicornuate) or completely divided (didelphic) uterus
in affected females, representing defects of Mullerian duct fusion.
Common in affected females.
phenotype_term:
preferred_term: Bicornuate uterus
term:
id: HP:0000813
label: Bicornuate uterus
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "Uterine anomalies are common in females with HFG, and typically involve a partially divided (bicornuate) or completely divided (didelphic) uterus, representing defects of Müllerian duct fusion"
explanation: "Mullerian duct fusion defects causing bicornuate or didelphic uterus are common in affected females."
- name: Hypospadias
description: >
Ventrally displaced urethral opening in affected males, with
variable severity.
phenotype_term:
preferred_term: Hypospadias
term:
id: HP:0000047
label: Hypospadias
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "affected males may have hypospadias (ventrally misplaced urethral opening) of variable severity"
explanation: "Hypospadias of variable severity is a feature in affected males."
genetic:
- name: HOXA13 Mutations
association: Causative
notes: >
Heterozygous mutations in HOXA13 including nonsense mutations that
truncate the homeodomain, polyalanine tract expansions, and missense
mutations in invariant domains. Polyalanine expansions in the third
polyalanine tract can insert up to 10 alanines in-frame. Different
mutation types may produce different severities.
evidence:
- reference: PMID:9020844
reference_title: "Mutation of HOXA13 in hand-foot-genital syndrome."
supports: SUPPORT
snippet: "a HOXA13 nonsense mutation in a family with hand-foot-genital syndrome. The mutation converts a highly conserved tryptophan residue in the homeodomain to a stop codon"
explanation: "Identifies the first HOXA13 nonsense mutation causing HFGS."
- reference: PMID:10839976
reference_title: "Novel HOXA13 mutations and the phenotypic spectrum of hand-foot-genital syndrome."
supports: SUPPORT
snippet: "an expansion of an N-terminal polyalanine tract produces a similar phenotype"
explanation: "Polyalanine tract expansion is an alternative mutation mechanism in HFGS."
- reference: PMID:19591980
reference_title: "A novel mutation of HOXA13 in a family with hand-foot-genital syndrome and the role of polyalanine expansions in the spectrum of Müllerian fusion anomalies."
supports: SUPPORT
snippet: "Affected members of a family with HFGS showed a novel expansion of the third polyalanine tract of HOXA13, inserting 10 alanines in-frame"
explanation: "Specific polyalanine expansion of 10 residues in the third tract causes HFGS."
- reference: PMID:19591980
reference_title: "A novel mutation of HOXA13 in a family with hand-foot-genital syndrome and the role of polyalanine expansions in the spectrum of Müllerian fusion anomalies."
supports: SUPPORT
snippet: "The cause of uterovaginal septa without hand and foot symptoms differs from true HFGS"
explanation: "Isolated uterine septa without limb involvement are not caused by HOXA13 mutations, clarifying the diagnostic boundary."
- name: HOXA13
gene_term:
preferred_term: HOXA13
term:
id: hgnc:5102
label: HOXA13
association: Pathogenic Variants
evidence:
- reference: CGGV:assertion_a138effd-f406-4791-b0eb-1f7f89c381d7-2025-07-22T160000.000Z
reference_title: "HOXA13 / hand-foot-genital syndrome (Definitive)"
supports: SUPPORT
evidence_source: OTHER
snippet: "HOXA13 | HGNC:5102 | hand-foot-genital syndrome | MONDO:0007698 | AD | Definitive"
explanation: ClinGen classifies the HOXA13-hand-foot-genital syndrome gene-disease relationship as definitive with autosomal dominant inheritance.
treatments:
- name: Surgical Correction
description: >
Surgical management of Mullerian duct anomalies (uterine septum
resection) and limb deformities as needed.
treatment_term:
preferred_term: surgical procedure
term:
id: MAXO:0000004
label: surgical procedure
- name: Genetic Counseling
description: >
Genetic counseling for affected families given autosomal dominant
inheritance with full penetrance.
treatment_term:
preferred_term: genetic counseling
term:
id: MAXO:0000079
label: genetic counseling
references:
- reference: DOI:10.1002/ajmg.10776
title: Limb malformations and the human <i>HOX</i> genes
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: HOX genes encode a family of transcription factors of fundamental importance for body patterning during embryonic development.
supporting_text: HOX genes encode a family of transcription factors of fundamental importance for body patterning during embryonic development.
evidence:
- reference: DOI:10.1002/ajmg.10776
reference_title: Limb malformations and the human <i>HOX</i> genes
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: HOX genes encode a family of transcription factors of fundamental importance for body patterning during embryonic development.
explanation: Deep research cited this publication as relevant literature for Hand-Foot-Genital Syndrome.
- reference: DOI:10.1002/ajmg.a.35843
title: Analysis of De Novo <scp><i>HOXA</i></scp><i>13</i> Polyalanine Expansions Supports Replication Slippage Without Repair in Their Generation
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: Polyalanine repeat expansion diseases are hypothesized to result from unequal chromosomal recombination, yet mechanistic studies are lacking.
supporting_text: Polyalanine repeat expansion diseases are hypothesized to result from unequal chromosomal recombination, yet mechanistic studies are lacking.
evidence:
- reference: DOI:10.1002/ajmg.a.35843
reference_title: Analysis of De Novo <scp><i>HOXA</i></scp><i>13</i> Polyalanine Expansions Supports Replication Slippage Without Repair in Their Generation
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: Polyalanine repeat expansion diseases are hypothesized to result from unequal chromosomal recombination, yet mechanistic studies are lacking.
explanation: Deep research cited this publication as relevant literature for Hand-Foot-Genital Syndrome.
- reference: DOI:10.1002/ajmg.a.36648
title: Severe manifestations of hand‐foot‐genital syndrome associated with a novel <i>HOXA13</i> mutation
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: We report on a girl with absent nails, short/absent distal phalanges of the second to fifth fingers and toes, short thumbs, absent halluces, and carpo‐tarsal coalition who also had genitourinary malformations.
supporting_text: We report on a girl with absent nails, short/absent distal phalanges of the second to fifth fingers and toes, short thumbs, absent halluces, and carpo‐tarsal coalition who also had genitourinary malformations.
evidence:
- reference: DOI:10.1002/ajmg.a.36648
reference_title: Severe manifestations of hand‐foot‐genital syndrome associated with a novel <i>HOXA13</i> mutation
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: We report on a girl with absent nails, short/absent distal phalanges of the second to fifth fingers and toes, short thumbs, absent halluces, and carpo‐tarsal coalition who also had genitourinary malformations.
explanation: Deep research cited this publication as relevant literature for Hand-Foot-Genital Syndrome.
- reference: DOI:10.1002/ajmg.a.37478
title: 'Dual genetic diagnoses: Atypical hand‐foot‐genital syndrome and developmental delay due to de novo mutations in <i>HOXA13</i> and <i>NRXN1</i>'
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: We describe a male patient with dual genetic diagnoses of atypical hand‐foot‐genital syndrome (HFGS) and developmental delay.
supporting_text: We describe a male patient with dual genetic diagnoses of atypical hand‐foot‐genital syndrome (HFGS) and developmental delay.
evidence:
- reference: DOI:10.1002/ajmg.a.37478
reference_title: 'Dual genetic diagnoses: Atypical hand‐foot‐genital syndrome and developmental delay due to de novo mutations in <i>HOXA13</i> and <i>NRXN1</i>'
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: We describe a male patient with dual genetic diagnoses of atypical hand‐foot‐genital syndrome (HFGS) and developmental delay.
explanation: Deep research cited this publication as relevant literature for Hand-Foot-Genital Syndrome.
- reference: DOI:10.1007/s00439-002-0712-8
title: 'A novel stable polyalanine [poly(A)] expansion in the HOXA13 gene associated with hand-foot-genital syndrome: proper function of poly(A)-harbouring transcription factors depends on a critical repeat length?'
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: 'A novel stable polyalanine [poly(A)] expansion in the HOXA13 gene associated with hand-foot-genital syndrome: proper function of poly(A)-harbouring transcription factors depends on a critical repeat length?'
supporting_text: 'A novel stable polyalanine [poly(A)] expansion in the HOXA13 gene associated with hand-foot-genital syndrome: proper function of poly(A)-harbouring transcription factors depends on a critical repeat length?'
- reference: DOI:10.1016/j.ajhg.2024.04.018
title: The impact of inversions across 33,924 families with rare disease from a national genome sequencing project
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: The impact of inversions across 33,924 families with rare disease from a national genome sequencing project
supporting_text: The impact of inversions across 33,924 families with rare disease from a national genome sequencing project
- reference: DOI:10.1093/hmg/ddh306
title: 'Polyalanine expansion in HOXA13: three new affected families and the molecular consequences in a mouse model'
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: 'Polyalanine expansion in HOXA13: three new affected families and the molecular consequences in a mouse model'
supporting_text: 'Polyalanine expansion in HOXA13: three new affected families and the molecular consequences in a mouse model'
- reference: DOI:10.1136/jmg.40.4.e49
title: A novel duplication in the <i>HOXA13</i> gene in a family with atypical hand-foot-genital syndrome
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: A novel duplication in the <i>HOXA13</i> gene in a family with atypical hand-foot-genital syndrome
supporting_text: A novel duplication in the <i>HOXA13</i> gene in a family with atypical hand-foot-genital syndrome
- reference: DOI:10.3892/mmr.2023.12946
title: 'Genetic and phenotypic continuum of HOXA genes: A case with double HOXA9/HOXA13 mutations'
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings:
- statement: 'Genetic and phenotypic continuum of HOXA genes: A case with double HOXA9/HOXA13 mutations'
supporting_text: 'Genetic and phenotypic continuum of HOXA genes: A case with double HOXA9/HOXA13 mutations'
- reference: DOI:10.1086/302961
title: Novel HOXA13 Mutations and the Phenotypic Spectrum of Hand-Foot-Genital Syndrome
found_in:
- Hand-Foot-Genital_Syndrome-deep-research-falcon.md
findings: []
Hand-Foot-Genital Syndrome (HFGS) is a rare, autosomal dominant developmental malformation syndrome caused by pathogenic variation in HOXA13, a homeobox transcription factor essential for distal limb and urogenital tract development (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6). The core phenotype is highly penetrant distal limb malformations (notably first-digit hypoplasia) with variably penetrant genitourinary anomalies (hypospadias in males; Müllerian fusion anomalies and/or urinary tract abnormalities in females) (goodman2000novelhoxa13mutations pages 1-2, utsch2002anovelstable pages 1-2). Recent (2023–2024) genomics literature emphasizes that structural variants (SVs) such as inversions can be under-ascertained by standard tests and may contribute to unresolved Mendelian phenotypes, supporting broader use of genome sequencing and SV-aware interpretation (pagnamenta2024theimpactof pages 1-2).
HFGS is “a rare, dominantly inherited condition characterized by distal limb and distal genitourinary tract malformations” (Goodman et al., 2000; published online 2000-06-05; https://doi.org/10.1086/302961) (goodman2000novelhoxa13mutations pages 1-2). Classic limb findings are typically bilateral and symmetric and include first-digit hypoplasia (thumb and hallux) with carpal/tarsal anomalies, while genitourinary findings show incomplete penetrance and variable severity (goodman2000novelhoxa13mutations pages 1-2, utsch2002anovelstable pages 1-2).
Abstract quote (primary literature): “Hand-foot-genital syndrome (HFGS) is a rare, dominantly inherited condition affecting the distal limbs and genitourinary tract.” (Goodman et al., 2000) (goodman2000novelhoxa13mutations pages 1-2).
The current evidence base is predominantly: - Aggregated disease-level descriptions (review-style synthesis and multi-family genetic reports) (goodman2002limbmalformationsand pages 5-6, utsch2002anovelstable pages 1-2). - Individual/family-based primary reports (case reports/series and family studies with segregation) (goodman2000novelhoxa13mutations pages 1-2, owens2013analysisofde pages 2-3).
Primary cause: germline pathogenic variants affecting HOXA13 function (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6).
Variant classes reported across the core literature include: - Nonsense/truncating variants (predicted loss of function) (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6). - Missense variants (often in the DNA-binding homeodomain; can associate with unusually severe limb phenotypes) (goodman2000novelhoxa13mutations pages 1-2, imagawa2014severemanifestationsof pages 4-5). - In-frame polyalanine tract expansions in the N-terminus (goodman2000novelhoxa13mutations pages 1-2, innis2004polyalanineexpansionin pages 1-2). - Duplications affecting HOXA13 (reported in atypical HFGS) (frisen2003anovelduplication pages 1-1, frisen2003anovelduplication pages 5-5). - Larger structural changes including deletions affecting the HOXA cluster (discussed as part of mutational spectrum) (utsch2002anovelstable pages 1-2, frisen2003anovelduplication pages 1-1).
Recent development (genomics diagnostics): structural variants such as inversions can underlie rare disease and may be missed by copy-number-focused pipelines, supporting the use of genome sequencing for unsolved cases (Pagnamenta et al., 2024-06-06, AJHG; https://doi.org/10.1016/j.ajhg.2024.04.018) (pagnamenta2024theimpactof pages 1-2).
No evidence for genetic/environmental protective factors specific to HFGS was identified in the ingested sources (gap).
No direct gene–environment interaction evidence specific to HFGS was identified in the ingested sources (gap).
Commonly described findings include: - First-digit hypoplasia: short, proximally placed thumbs and short, medially deviated halluces; hypoplastic thenar eminences (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6, utsch2002anovelstable pages 1-2). - Carpal/tarsal ossification anomalies: delayed ossification, fusion, shortening of carpals and tarsals (goodman2000novelhoxa13mutations pages 1-2, utsch2002anovelstable pages 1-2). - Additional digital findings: ulnar deviation of second fingers, clinodactyly/brachydactyly (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6, utsch2002anovelstable pages 1-2).
Penetrance statement: limb abnormalities are described as fully penetrant / highly penetrant in reported series (utsch2002anovelstable pages 1-2, frisen2003anovelduplication pages 1-1).
Suggested HPO terms (examples): - First digit hypoplasia: HP:0005864 (Thumb hypoplasia; approximate mapping) - Hypoplastic thenar eminence: HP:0030438 (Thenar hypoplasia; approximate) - Hallux deviation/varus/valgus: HP:0001847 (Hallux varus) / HP:0001838 (Hallux valgus; approximate) - Carpal/tarsal coalition/fusion: HP:0009702 (Carpal fusion) / HP:0008367 (Tarsal coalition; approximate)
(Exact HPO IDs should be verified during curation; the phenotype concepts are strongly supported by primary descriptions.) (goodman2000novelhoxa13mutations pages 1-2, utsch2002anovelstable pages 1-2).
Statistics (reported in a major review): - Müllerian duct fusion defects in females are described as occurring in ~50% of affected females (Goodman 2002) (goodman2002limbmalformationsand pages 5-6). - Urinary tract anomalies were described as occurring in <20% in that summary (with potential for chronic pyelonephritis and renal insufficiency) (goodman2002limbmalformationsand pages 5-6).
Suggested HPO terms (examples): - Hypospadias: HP:0000047 - Uterine didelphys / double uterus: HP:0000135 (Uterus didelphys; approximate) - Longitudinal vaginal septum: HP:0100644 (Vaginal septum; approximate) - Vesicoureteral reflux: HP:0000076 - Recurrent urinary tract infections: HP:0000010
HFGS is a congenital malformation syndrome with abnormalities typically evident at birth or early in life (limb phenotype), while genitourinary manifestations may be discovered during childhood/adolescence/adulthood (e.g., evaluation for UTIs, imaging of Müllerian anomalies, fertility workup) (goodman2000novelhoxa13mutations pages 1-2, owens2013analysisofde pages 2-3, jaouadi2023geneticandphenotypic pages 1-2).
Primary evidence indicates potential impact via: - Functional and orthopedic consequences of limb malformations (hand/foot anatomy) (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6). - Urologic morbidity (recurrent UTIs, urinary leakage, renal impairment risk) and reproductive outcomes (fetal loss/neonatal death reported in at least three families in early literature) (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6, owens2013analysisofde pages 2-3).
Evidence supports at least two broad mechanistic categories: 1) Loss-of-function / haploinsufficiency-like outcomes (notably truncating variants; and some polyalanine expansions with reduced protein abundance) (innis2004polyalanineexpansionin pages 1-2, goodman2000novelhoxa13mutations pages 1-2). 2) Dominant-negative and/or gain-of-function possibilities for certain missense variants and some polyalanine expansions, discussed as explaining unusually severe phenotypes compared with null alleles (utsch2002anovelstable pages 6-7, imagawa2014severemanifestationsof pages 4-5, frisen2003anovelduplication pages 5-5).
Key variant categories documented in the ingested primary literature: - Truncating/nonsense variants leading to truncated proteins (Goodman 2000) (goodman2000novelhoxa13mutations pages 1-2). - Polyalanine expansions in HOXA13 (Innis 2004; Utsch 2002) (innis2004polyalanineexpansionin pages 1-2, utsch2002anovelstable pages 1-2). - Abstract quote (Innis 2004): “Polyalanine expansions … can cause HFGS.” and “Mutant limb buds had … reduced levels of steady-state protein… loss of function is secondary to a reduction in the in vivo abundance of the expanded protein likely due to degradation.” (Innis et al., 2004-11; https://doi.org/10.1093/hmg/ddh306) (innis2004polyalanineexpansionin pages 1-2). - Duplications (including “novel HOXA13 duplication” associated with atypical HFGS) (frisen2003anovelduplication pages 1-1, frisen2003anovelduplication pages 5-5). - De novo polyalanine expansions with molecular evidence consistent with replication slippage (Owens 2013) (owens2013analysisofde pages 2-3).
The phenotype can be complicated by additional variants in other genes in some individuals, consistent with “phenotypic blending” / multiple diagnoses in modern genomics (concept supported by rare disease genome sequencing studies and reported dual diagnoses including HOXA13 plus another gene in case literature) (wallis2016dualgeneticdiagnoses pages 6-7, pagnamenta2024theimpactof pages 1-2).
No disease-specific epigenetic mechanisms for HFGS were identified in the ingested sources (gap).
The mutational spectrum discussed in the HFGS literature includes HOXA cluster deletions and other SV mechanisms (utsch2002anovelstable pages 1-2, frisen2003anovelduplication pages 1-1). Separately, recent large-cohort genome sequencing indicates inversions are an under-recognized disease mechanism in general and can act via gene disruption or altered regulatory landscapes (pagnamenta2024theimpactof pages 1-2).
No established non-genetic environmental or infectious contributors were identified for HFGS in the ingested sources; HFGS is treated as a Mendelian developmental disorder (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6).
1) Upstream trigger: germline pathogenic variant affecting HOXA13 (goodman2000novelhoxa13mutations pages 1-2). 2) Molecular consequence: altered transcription factor function (via reduced protein abundance/degradation for some polyalanine expansions; altered DNA-binding for homeodomain missense; truncation removing key domains) (innis2004polyalanineexpansionin pages 1-2, imagawa2014severemanifestationsof pages 4-5, goodman2002limbmalformationsand pages 5-6). 3) Developmental pathway disruption: impaired patterning and morphogenesis of distal limbs and urogenital tract derivatives (goodman2002limbmalformationsand pages 5-6, utsch2002anovelstable pages 1-2). 4) Organ-level manifestations: first-digit hypoplasia/carpal-tarsal defects and hypospadias/Müllerian anomalies/urinary anomalies (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6).
GO biological process (examples to curate/validate): - Pattern specification process (GO:0007389) - Limb development / appendage development (e.g., GO:0060173 / GO:0048736) - Urogenital system development (GO:0001655) - Regulation of programmed cell death (for interdigital apoptosis; GO:0043067)
Cell types (CL) likely involved (developmental): - Limb bud mesenchymal cell (CL term requires curator selection) - Urogenital sinus / genital tubercle mesenchyme (developmental CL terms require curator selection)
These ontology mappings are consistent with the mechanistic descriptions but require formal term validation during curation (imagawa2014severemanifestationsof pages 4-5, innis2004polyalanineexpansionin pages 1-2).
Suggested UBERON terms (examples): - UBERON:0002398 (hand), UBERON:0002108 (foot) - UBERON:0000945 (uterus), UBERON:0000996 (vagina) - UBERON:0001255 (urinary bladder), UBERON:0000056 (ureter)
HOXA13 is a transcription factor (nuclear localization implied), and polyalanine expansions can alter protein abundance; specific organelle-level pathology beyond this is not described in the ingested sources (innis2004polyalanineexpansionin pages 1-2).
Robust population prevalence/incidence estimates were not found in the ingested sources (gap).
A frequently cited early aggregation reported: “nine families and three sporadic cases” totaling “52 affected individuals (34 males, 18 females)” (Utsch et al., 2002-04; https://doi.org/10.1007/s00439-002-0712-8) (utsch2002anovelstable pages 1-2). This is not a prevalence estimate but provides early ascertainment scale.
Founder effects, consanguinity, carrier frequency: not identified in ingested sources (gap).
Suspicion is based on the combination of: - Typical bilateral distal limb pattern (thumb/hallux hypoplasia, carpal/tarsal anomalies) (goodman2000novelhoxa13mutations pages 1-2, utsch2002anovelstable pages 1-2). - Genitourinary anomalies (hypospadias; Müllerian fusion anomalies; urinary anomalies) with variable penetrance (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6).
Evidence across time supports a tiered approach: - Targeted HOXA13 sequencing (PCR/Sanger validation) has been used in classic families (goodman2000novelhoxa13mutations pages 1-2, imagawa2014severemanifestationsof pages 4-5, owens2013analysisofde pages 2-3). - WES can identify novel HOXA13 missense variants in syndromic presentations (Jaouadi 2023; received 2022-10-04; accepted 2022-11-30; https://doi.org/10.3892/mmr.2023.12946) (jaouadi2023geneticandphenotypic pages 1-2). - Genome sequencing with SV-aware analysis is increasingly important because inversion and other complex SV classes can be missed by copy-number-focused pipelines; large rare disease cohort work shows inversions are a “small but notable” contributor and can resolve prolonged diagnostic odysseys (Pagnamenta 2024) (pagnamenta2024theimpactof pages 1-2).
In severe limb phenotypes due to HOXA13 missense, differential diagnoses discussed include brachydactyly type B1 and Cook syndrome (imagawa2014severemanifestationsof pages 4-5).
No newborn screening or population screening programs were identified for HFGS in the ingested sources; however, family-based cascade testing is implied by autosomal dominant inheritance and de novo possibility (goodman2000novelhoxa13mutations pages 1-2, owens2013analysisofde pages 2-3).
HFGS is not presented as a life-shortening disorder per se in the ingested sources; morbidity primarily reflects urogenital complications (reflux, UTIs, renal insufficiency) and reproductive outcomes in affected females (goodman2002limbmalformationsand pages 5-6, goodman2000novelhoxa13mutations pages 1-2). Severe urologic dysfunction can require major reconstructive interventions in some cases (owens2013analysisofde pages 2-3).
Management is individualized and typically includes: - Urologic evaluation and treatment of reflux/obstruction/UTIs; in severe cases, reconstructive procedures. - Example of high-intensity management reported: bladder augmentation and creation of a Mitrofanoff channel for urinary leakage and small bladder, in a patient with HOXA13 polyalanine expansion (Owens 2013) (owens2013analysisofde pages 2-3). - Surgical repair of hypospadias when indicated (not quantified in ingested sources, but repeatedly listed as a key manifestation) (goodman2000novelhoxa13mutations pages 1-2, innis2004polyalanineexpansionin pages 1-2). - Orthopedic/hand-foot care as needed for function and footwear (not detailed quantitatively in ingested sources) (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6).
No disease-specific pharmacologic therapy targeting HOXA13 mechanisms was identified (gap).
ClinicalTrials.gov searches retrieved observational studies related to hypospadias and other conditions, but no HFGS-specific interventional clinical trials were identified in the retrieved trial set (gap; based on current tool results).
Primary prevention is not applicable for inherited HFGS beyond reproductive planning.
Autosomal dominant inheritance supports: - Cascade testing of at-risk relatives once a familial HOXA13 variant is known (goodman2000novelhoxa13mutations pages 1-2). - Prenatal diagnosis or preimplantation genetic testing may be considered for known familial variants (not directly described in ingested sources, but standard for AD Mendelian disorders; should be treated as an implementation inference).
No naturally occurring veterinary analogs were identified in the ingested sources (gap).
Mouse models provide functional evidence linking HOXA13 disruptions to the phenotype: - A mouse HOXA13 polyalanine expansion model showed phenotypes indistinguishable from null mice and demonstrated that loss of function can arise from reduced in vivo abundance of the expanded protein (Innis 2004) (innis2004polyalanineexpansionin pages 1-2). - Review-level summaries note that homozygous loss of Hoxa13 is lethal and produces severe urinary/genital tract malformations, supporting developmental essentiality (Goodman 2002) (goodman2002limbmalformationsand pages 5-6).
1) Expanded syndromic context and penetrance framing (2023): A 2023 case-based paper reiterates HFGS (OMIM 140000) as a HOXA13-related autosomal dominant disorder with fully penetrant limb defects and partially penetrant genitourinary anomalies, and emphasizes variable fertility implications (Jaouadi 2023; https://doi.org/10.3892/mmr.2023.12946) (jaouadi2023geneticandphenotypic pages 1-2). 2) Structural variants and diagnostic implementation (2024): A large rare disease genome sequencing analysis highlights how inversions and complex SVs contribute to Mendelian diagnoses and can be missed by routine approaches, supporting broader implementation of WGS/SV detection for unresolved phenotypes (Pagnamenta 2024-06-06; https://doi.org/10.1016/j.ajhg.2024.04.018) (pagnamenta2024theimpactof pages 1-2).
| Disease name | Synonyms / alternative names | OMIM number | Causal gene | Inheritance | Key phenotypic hallmarks: hands/feet | Key phenotypic hallmarks: genitourinary | Key references (year; DOI / URL) |
|---|---|---|---|---|---|---|---|
| Hand-Foot-Genital Syndrome | HFGS; hand-foot-genital syndrome; hand–foot–genital syndrome | OMIM 140000 | HOXA13 | Autosomal dominant | Distal limb malformations with first-digit hypoplasia; short, proximally placed thumbs; hypoplastic thenar eminences; short, medially deviated halluces; delayed ossification/fusion/shortening of carpals and tarsals; clinodactyly/brachydactyly may occur (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6, utsch2002anovelstable pages 1-2, jaouadi2023geneticandphenotypic pages 1-2, innis2004polyalanineexpansionin pages 1-2) | Distal genitourinary tract malformations with variable expressivity; hypospadias in males; Müllerian duct fusion defects in females (e.g., vaginal septum, double uterus with double cervix, bicornuate uterus); urinary anomalies can include vesicoureteric reflux, ectopic ureteric orifices, pelvi-ureteric/ureteropelvic junction obstruction, recurrent UTIs, and risk of renal insufficiency (goodman2000novelhoxa13mutations pages 1-2, goodman2002limbmalformationsand pages 5-6, utsch2002anovelstable pages 1-2, jaouadi2023geneticandphenotypic pages 1-2, innis2004polyalanineexpansionin pages 1-2) | Goodman 2000; doi:10.1086/302961; https://doi.org/10.1086/302961 (goodman2000novelhoxa13mutations pages 1-2) |
| Hand-Foot-Genital Syndrome | HFGS; HFG syndrome / HFU syndrome (older abbreviation in literature) | OMIM 140000; OMIM 142959 also cited in older literature context | HOXA13 | Autosomal dominant | Limb defects are described as fully penetrant / highly penetrant in reported series; bilateral and symmetrical in typical cases (utsch2002anovelstable pages 1-2, jaouadi2023geneticandphenotypic pages 1-2) | Genitourinary anomalies are incompletely penetrant / partially penetrant and variably severe, with fertility implications in some affected females (goodman2000novelhoxa13mutations pages 1-2, utsch2002anovelstable pages 1-2, jaouadi2023geneticandphenotypic pages 1-2) | Goodman 2002; doi:10.1002/ajmg.10776; https://doi.org/10.1002/ajmg.10776 (goodman2002limbmalformationsand pages 5-6) |
| Hand-Foot-Genital Syndrome | HFGS | OMIM 140000 | HOXA13 | Autosomal dominant | Typical phenotype can result from nonsense mutations and polyalanine tract expansions; missense variants may produce more severe limb phenotypes (goodman2000novelhoxa13mutations pages 1-2, imagawa2014severemanifestationsof pages 4-5) | Typical phenotype includes hypospadias, Müllerian anomalies, and urinary tract abnormalities; severity is variable across families (goodman2000novelhoxa13mutations pages 1-2, imagawa2014severemanifestationsof pages 4-5) | Utsch 2002; doi:10.1007/s00439-002-0712-8; https://doi.org/10.1007/s00439-002-0712-8 (utsch2002anovelstable pages 1-2, utsch2002anovelstable pages 6-7) |
| Hand-Foot-Genital Syndrome | HFGS | OMIM 140000 | HOXA13 | Autosomal dominant | Polyalanine expansions in all three major HOXA13 polyalanine repeats can cause HFGS; common phenotype includes bilaterally symmetrical shortening of thumbs and halluces with clinobrachydactyly (innis2004polyalanineexpansionin pages 1-2) | Genitourinary anomalies may include hypospadias, ureteral reflux, and incomplete Müllerian fusion (innis2004polyalanineexpansionin pages 1-2) | Innis 2004; doi:10.1093/hmg/ddh306; https://doi.org/10.1093/hmg/ddh306 (innis2004polyalanineexpansionin pages 1-2) |
| Hand-Foot-Genital Syndrome | HFGS | OMIM 140000 | HOXA13 | Autosomal dominant | Recent review/case literature reiterates bilateral, symmetrical distal limb anomalies centered on first-digit hypoplasia and wrist/foot ossification defects (jaouadi2023geneticandphenotypic pages 1-2) | Recent review/case literature reiterates genitourinary malformations with variable penetrance; females do not necessarily have infertility (jaouadi2023geneticandphenotypic pages 1-2) | Jaouadi 2023; doi:10.3892/mmr.2023.12946; https://doi.org/10.3892/mmr.2023.12946 (jaouadi2023geneticandphenotypic pages 1-2) |
| Hand-Foot-Genital Syndrome | HFGS | OMIM 140000 | HOXA13 | Autosomal dominant | Structural variant studies expand the mutational spectrum affecting HOXA13-related disease; inversions can contribute to rare disease diagnosis where targeted prior testing was negative (pagnamenta2024theimpactof pages 1-2) | Structural rearrangements near/disrupting developmental genes such as HOXA13 may alter regulatory landscape and contribute to disease phenotypes, relevant to unresolved HFGS-like presentations (pagnamenta2024theimpactof pages 1-2) | Pagnamenta 2024; doi:10.1016/j.ajhg.2024.04.018; https://doi.org/10.1016/j.ajhg.2024.04.018 (pagnamenta2024theimpactof pages 1-2) |
Table: This table summarizes the core identifiers, naming, inheritance, causal gene, and hallmark clinical features of Hand-Foot-Genital Syndrome using only the specified evidence sources. It is useful as a compact disease knowledge base seed for nomenclature and phenotype curation.
References
(goodman2000novelhoxa13mutations pages 1-2): Frances R. Goodman, Chiara Bacchelli, Angela F. Brady, Louise A. Brueton, Jean-Pierre Fryns, Douglas P. Mortlock, Jeffrey W. Innis, Lewis B. Holmes, Alan E. Donnenfeld, Murray Feingold, Frits A. Beemer, Raoul C.M. Hennekam, and Peter J. Scambler. Novel hoxa13 mutations and the phenotypic spectrum of hand-foot-genital syndrome. The American Journal of Human Genetics, 67:197-202, Jul 2000. URL: https://doi.org/10.1086/302961, doi:10.1086/302961. This article has 288 citations.
(goodman2002limbmalformationsand pages 5-6): Frances R. Goodman. Limb malformations and the human hox genes. American journal of medical genetics, 112 3:256-65, Oct 2002. URL: https://doi.org/10.1002/ajmg.10776, doi:10.1002/ajmg.10776. This article has 294 citations.
(utsch2002anovelstable pages 1-2): Boris Utsch, Karl Becker, Detlef Brock, Michael J. Lentze, Frank Bidlingmaier, and Michael Ludwig. A novel stable polyalanine [poly(a)] expansion in the hoxa13 gene associated with hand-foot-genital syndrome: proper function of poly(a)-harbouring transcription factors depends on a critical repeat length? Human Genetics, 110:488-494, Apr 2002. URL: https://doi.org/10.1007/s00439-002-0712-8, doi:10.1007/s00439-002-0712-8. This article has 74 citations and is from a peer-reviewed journal.
(pagnamenta2024theimpactof pages 1-2): Alistair T. Pagnamenta, Jing Yu, Susan Walker, Alexandra J. Noble, Jenny Lord, Prasun Dutta, Mona Hashim, Carme Camps, Hannah Green, Smrithi Devaiah, Lina Nashef, Jason Parr, Carl Fratter, Rana Ibnouf Hussein, Sarah J. Lindsay, Fiona Lalloo, Benito Banos-Pinero, David Evans, Lucy Mallin, Adrian Waite, Julie Evans, Andrew Newman, Zoe Allen, Cristina Perez-Becerril, Gavin Ryan, Rachel Hart, John Taylor, Tina Bedenham, Emma Clement, Ed Blair, Eleanor Hay, Francesca Forzano, Jenny Higgs, Natalie Canham, Anirban Majumdar, Meriel McEntagart, Nayana Lahiri, Helen Stewart, Sarah Smithson, Eduardo Calpena, Adam Jackson, Siddharth Banka, Hannah Titheradge, Ruth McGowan, Julia Rankin, Charles Shaw-Smith, D. Gareth Evans, George J. Burghel, Miriam J. Smith, Emily Anderson, Rajesh Madhu, Helen Firth, Sian Ellard, Paul Brennan, Claire Anderson, Doug Taupin, Mark T. Rogers, Jackie A. Cook, Miranda Durkie, James E. East, Darren Fowler, Louise Wilson, Rebecca Igbokwe, Alice Gardham, Ian Tomlinson, Diana Baralle, Holm H. Uhlig, and Jenny C. Taylor. The impact of inversions across 33,924 families with rare disease from a national genome sequencing project. The American Journal of Human Genetics, 111:1140-1164, Jun 2024. URL: https://doi.org/10.1016/j.ajhg.2024.04.018, doi:10.1016/j.ajhg.2024.04.018. This article has 36 citations.
(jaouadi2023geneticandphenotypic pages 1-2): Hager Jaouadi, Alexis Theron, Giulia Norscini, Jean-François Avierinos, and Stéphane Zaffran. Genetic and phenotypic continuum of hoxa genes: a case with double hoxa9/hoxa13 mutations. Molecular Medicine Reports, Jan 2023. URL: https://doi.org/10.3892/mmr.2023.12946, doi:10.3892/mmr.2023.12946. This article has 3 citations and is from a peer-reviewed journal.
(owens2013analysisofde pages 2-3): Kailey M. Owens, Shane C. Quinonez, Peedikayil E. Thomas, Catherine E. Keegan, Nanci Lefebvre, Diane Roulston, Christine A. Larsen, H. Scott Stadler, and Jeffrey W. Innis. Analysis of de novo hoxa13 polyalanine expansions supports replication slippage without repair in their generation. American Journal of Medical Genetics Part A, 161:1019-1027, May 2013. URL: https://doi.org/10.1002/ajmg.a.35843, doi:10.1002/ajmg.a.35843. This article has 11 citations.
(imagawa2014severemanifestationsof pages 4-5): Eri Imagawa, Hülya Kayserili, Gen Nishimura, Mitsuko Nakashima, Yoshinori Tsurusaki, Hirotomo Saitsu, Shiro Ikegawa, Naomichi Matsumoto, and Noriko Miyake. Severe manifestations of hand‐foot‐genital syndrome associated with a novel hoxa13 mutation. American Journal of Medical Genetics Part A, 164:2398-2402, Sep 2014. URL: https://doi.org/10.1002/ajmg.a.36648, doi:10.1002/ajmg.a.36648. This article has 26 citations.
(innis2004polyalanineexpansionin pages 1-2): Jeffrey W. Innis, Douglas Mortlock, Zhi Chen, Michael Ludwig, Melissa E. Williams, Thomas M. Williams, Colleen D. Doyle, Zhihong Shao, Michael Glynn, Davor Mikulic, Katarina Lehmann, Stefan Mundlos, and Boris Utsch. Polyalanine expansion in hoxa13: three new affected families and the molecular consequences in a mouse model. Human molecular genetics, 13 22:2841-51, Nov 2004. URL: https://doi.org/10.1093/hmg/ddh306, doi:10.1093/hmg/ddh306. This article has 59 citations and is from a domain leading peer-reviewed journal.
(frisen2003anovelduplication pages 1-1): L. Frisén, K. Lagerstedt, M. Tapper-Persson, Ingrid Kockum, and A. Nordenskjöld. A novel duplication in the hoxa13 gene in a family with atypical hand-foot-genital syndrome. Journal of Medical Genetics, 40:e49-e49, Apr 2003. URL: https://doi.org/10.1136/jmg.40.4.e49, doi:10.1136/jmg.40.4.e49. This article has 37 citations and is from a domain leading peer-reviewed journal.
(frisen2003anovelduplication pages 5-5): L. Frisén, K. Lagerstedt, M. Tapper-Persson, Ingrid Kockum, and A. Nordenskjöld. A novel duplication in the hoxa13 gene in a family with atypical hand-foot-genital syndrome. Journal of Medical Genetics, 40:e49-e49, Apr 2003. URL: https://doi.org/10.1136/jmg.40.4.e49, doi:10.1136/jmg.40.4.e49. This article has 37 citations and is from a domain leading peer-reviewed journal.
(utsch2002anovelstable pages 6-7): Boris Utsch, Karl Becker, Detlef Brock, Michael J. Lentze, Frank Bidlingmaier, and Michael Ludwig. A novel stable polyalanine [poly(a)] expansion in the hoxa13 gene associated with hand-foot-genital syndrome: proper function of poly(a)-harbouring transcription factors depends on a critical repeat length? Human Genetics, 110:488-494, Apr 2002. URL: https://doi.org/10.1007/s00439-002-0712-8, doi:10.1007/s00439-002-0712-8. This article has 74 citations and is from a peer-reviewed journal.
(wallis2016dualgeneticdiagnoses pages 6-7): Mathew Wallis, Yoshinori Tsurusaki, Trent Burgess, Peter Borzi, Naomichi Matsumoto, Noriko Miyake, Deanna True, and Chirag Patel. Dual genetic diagnoses: atypical hand‐foot‐genital syndrome and developmental delay due to de novo mutations in hoxa13 and nrxn1. American Journal of Medical Genetics Part A, 170:717-724, Mar 2016. URL: https://doi.org/10.1002/ajmg.a.37478, doi:10.1002/ajmg.a.37478. This article has 15 citations.