Gordon syndrome (distal arthrogryposis type 3, DA3) is a rare autosomal dominant multiple congenital malformation syndrome defined by congenital contractures of the hands and feet, chiefly camptodactyly and clubfoot, with cleft palate in a minority of affected people. Short stature, scoliosis, ptosis, micrognathia, pectus excavatum and cryptorchidism occur in some individuals, and intelligence is usually normal. Penetrance is reduced and expressivity variable, with more reduced penetrance in females. Gordon syndrome is caused by heterozygous variants in PIEZO2, which encodes the principal mechanically activated cation channel of proprioceptive and touch sensory neurons; most families carry the recurrent c.8057G>A (p.Arg2686His) variant, which is significantly associated with cleft palate. The dominant PIEZO2 variants studied electrophysiologically make the channel recover faster from inactivation, increasing channel activity for a given mechanical stimulus, and a mouse carrying such a gain-of-function allele in proprioceptive sensory neurons develops shortened tendons and joint contractures. Gordon syndrome is allelic with distal arthrogryposis type 5 and Marden-Walker syndrome, which McMillin et al. regard as possibly variable expressions of one PIEZO2-related condition.
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Conditions with similar clinical presentations that must be differentiated from Gordon Syndrome:
name: Gordon Syndrome
creation_date: "2026-10-14T20:49:40Z"
category: Mendelian
description: >-
Gordon syndrome (distal arthrogryposis type 3, DA3) is a rare autosomal
dominant multiple congenital malformation syndrome defined by congenital
contractures of the hands and feet, chiefly camptodactyly and clubfoot, with
cleft palate in a minority of affected people. Short stature, scoliosis,
ptosis, micrognathia, pectus excavatum and cryptorchidism occur in some
individuals, and intelligence is usually normal. Penetrance is reduced and
expressivity variable, with more reduced penetrance in females. Gordon
syndrome is caused by heterozygous variants in PIEZO2, which encodes the
principal mechanically activated cation channel of proprioceptive and touch
sensory neurons; most families carry the recurrent c.8057G>A (p.Arg2686His)
variant, which is significantly associated with cleft palate. The dominant
PIEZO2 variants studied electrophysiologically make the channel recover
faster from inactivation, increasing channel activity for a given mechanical
stimulus, and a mouse carrying such a gain-of-function allele in
proprioceptive sensory neurons develops shortened tendons and joint
contractures. Gordon syndrome is allelic with distal arthrogryposis type 5
and Marden-Walker syndrome, which McMillin et al. regard as possibly variable
expressions of one PIEZO2-related condition.
synonyms:
- Gordon syndrome
- distal arthrogryposis type 3
- arthrogryposis, distal, type 3
- DA3
- distal arthrogryposis type IIA
- camptodactyly-cleft palate-clubfoot syndrome
parents:
- distal arthrogryposis
- multiple congenital anomalies/dysmorphic syndrome without intellectual disability
disease_term:
preferred_term: Gordon syndrome
term:
id: MONDO:0007252
label: Gordon syndrome
classifications:
harrisons_chapter:
- classification_value: GENETICS_ENVIRONMENT_DISEASE
references:
- reference: PMID:24726473
title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
- reference: PMID:36634173
title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
- reference: ORPHA:376
title: "Gordon syndrome"
inheritance:
- name: Autosomal dominant inheritance with reduced penetrance
inheritance_term:
preferred_term: Autosomal dominant inheritance
term:
id: HP:0000006
label: Autosomal dominant inheritance
penetrance: INCOMPLETE
expressivity: VARIABLE
description: >-
Gordon syndrome segregates as an autosomal dominant trait in multigeneration
families, with reduced penetrance and variable expressivity. Penetrance is
lower in females than in males, and in one five-generation family every
asymptomatic carrier was female. A probably de novo PIEZO2 variant has been
reported in a fetus of unaffected parents, in whom parental germline
mosaicism could not be excluded.
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Gordon syndrome (GS), or distal arthrogryposis type 3, is a rare, autosomal-dominant disorder characterized by cleft palate and congenital contractures of the hands and feet."
explanation: >-
The gene-discovery study describes Gordon syndrome as an autosomal
dominant disorder.
- reference: PMID:458832
reference_title: "Camptodactyly, cleft palate, and club foot (the Gordon syndrome). A report of a large pedigree."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A second family is described in which camptodactyly, club foot, and cleft palate (the Gordon syndrome) is transmitted in a pattern consistent with autosomal dominant inheritance with reduced penetrance and variable expressivity."
explanation: >-
A large pedigree shows autosomal dominant transmission with reduced
penetrance and variable expressivity.
- reference: PMID:8370149
reference_title: "Distal arthrogryposis with autosomal dominant inheritance and reduced penetrance in females: the Gordon syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Penetrance is more reduced in females than in males and asymptomatic carriers are always females."
explanation: >-
A five-generation family shows the sex difference in penetrance: all
asymptomatic carriers were female.
- reference: PMID:37587573
reference_title: "A novel PIEZO2 mutation in a fetus from a Chinese family with Gordon syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Sanger sequencing of the proband's parents resulted in normal chromatograms, suggesting that this was either a de novo variant in the fetus or, less likely, the result of germline mosaicism in the proband's mother or father."
explanation: >-
Documents a probable de novo occurrence in a simplex fetus, alongside
the familial dominant transmission seen in most reports.
prevalence:
- population: Worldwide
measure_type: POINT_PREVALENCE
prevalence_class: NOT_YET_DOCUMENTED
notes: >-
Orphanet records the worldwide point prevalence class as unknown. The
literature consists of a small number of families; a 1981 report
described the condition as known from only three previously described
families.
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "Unknown | Worldwide | Point prevalence | ORPHANET"
explanation: Orphanet epidemiology table gives no prevalence estimate.
- reference: PMID:7258227
reference_title: "The Gordon syndrome: autosomal dominant cleft palate, camptodactyly, and club feet."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The triad of a camptodactyly, club feet, and cleft palate, called the Gordon syndrome, is a rare autosomal dominant trait with variable expressivity, known from only three previously described families."
explanation: >-
The small number of reported families at the time illustrates the
rarity of the condition.
genetic:
- name: PIEZO2
gene_term:
preferred_term: PIEZO2
term:
id: hgnc:26270
label: PIEZO2
association: Causative (heterozygous, dominant)
relationship_type: CAUSATIVE
variant_origin: GERMLINE
notes: >-
PIEZO2 encodes a large mechanically activated non-selective cation channel,
the principal mechanotransducer for proprioception and light touch. In the
gene-discovery study PIEZO2 variants were found in all five exome-sequenced
Gordon syndrome families and in five of seven further families, and nine
families shared c.8057G>A (p.Arg2686His). Dominant PIEZO2 variants
cluster toward the C-terminal region, whereas the recessive variants that
cause a different, loss-of-function disorder cluster toward the N-terminal
region. The same gene causes distal arthrogryposis type 5 and a subset of
Marden-Walker syndrome.
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Exome sequencing of five GS-affected families identified mutations in piezo-type mechanosensitive ion channel component 2 (PIEZO2) in each family."
explanation: Identifies PIEZO2 as the Gordon syndrome gene.
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "In all affected family members, we identified the PIEZO2 mutation c.8057G>A (p.Arg2686His) by Sanger sequencing."
explanation: >-
Independent replication in a three-generation family with the recurrent
variant segregating with disease.
- reference: PMID:28728825
reference_title: "Genetic Diseases of PIEZO1 and PIEZO2 Dysfunction."
supports: SUPPORT
evidence_source: OTHER
quote_role: REVIEW_SYNTHESIS
snippet: "Gain-of-function mutations in the human PIEZO2 gene cause three clinical types of autosomal dominant distal arthrogryposis."
explanation: >-
A review places the dominant distal arthrogryposes, of which Gordon
syndrome is one, under PIEZO2 gain of function.
- reference: PMID:30988732
reference_title: "Mutations in PIEZO2 contribute to Gordon syndrome, Marden-Walker syndrome and distal arthrogryposis: A bioinformatics analysis of mechanisms."
supports: SUPPORT
evidence_source: COMPUTATIONAL
snippet: "Dominant mutations were mainly located in the C-terminal region, whereas recessive mutations were mainly localized in the N-terminal region"
explanation: >-
Supports the positional split between dominant (Gordon/DA5/MWS) and
recessive PIEZO2 variants.
variants:
- name: PIEZO2 c.8057G>A (p.Arg2686His)
clinical_significance: PATHOGENIC
description: >-
The recurrent Gordon syndrome variant, shared by nine families in the
gene-discovery series and reported independently in a three-generation
family and in a girl with Gordon syndrome and Dandy-Walker malformation.
Cleft palate is significantly associated with this variant. The cited
sources do not report a patch-clamp characterization of this specific
variant; its gain-of-function action is inferred from the
electrophysiology of other dominant PIEZO2 variants.
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Sanger sequencing revealed PIEZO2 mutations in five of seven additional families studied (for a total of 10/12 [83%] individuals), and nine families had an identical c.8057G>A (p.Arg2686His) mutation."
explanation: Establishes p.Arg2686His as the recurrent Gordon syndrome variant.
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The presence of cleft palate was significantly associated with c.8057G>A (Fisher's exact test, adjusted p value < 0.0001)."
explanation: Genotype-phenotype association between this variant and cleft palate.
- reference: PMID:36588752
reference_title: "Further Evidence of a Continuum in the Clinical Spectrum of Dominant PIEZO2-Related Disorders and Implications in Cerebellar Anomalies."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "In addition, another girl with the typical clinical features of GS is also described carrying the most prevalent reported variant (c.8057G>A, p.R2686H) in PIEZO2."
explanation: Further report of the recurrent variant in typical Gordon syndrome.
- name: PIEZO2 c.8576G>A (p.Trp2859*)
clinical_significance: UNCERTAIN_SIGNIFICANCE
description: >-
A heterozygous nonsense variant in exon 56, classified by the reporting
authors as of uncertain significance, found in a fetus with clubfoot,
camptodactyly, micrognathia and cleft palate and absent from both
parents. Its effect on the channel has not been tested.
evidence:
- reference: PMID:37587573
reference_title: "A novel PIEZO2 mutation in a fetus from a Chinese family with Gordon syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Whole-exome sequencing revealed that the fetus was heterozygous for a novel variant of uncertain significance in exon 56 (c.8576G>A; p.Trp2859*) of the Piezo-type mechanosensitive ion channel component 2 gene (PIEZO2) (NM_001378183.1)."
explanation: Reports the variant, its location and its uncertain-significance classification.
pathophysiology:
- name: PIEZO2 Gain-of-Function and Mechanotransduction Defect
biological_scale: MOLECULAR
role: trigger
mechanism_confidence: ESTABLISHED
description: >-
Heterozygous dominant PIEZO2 variants alter the kinetics of the
mechanically activated channel rather than abolishing it. The dominant
variants characterized by patch clamp (E2727del and I802F, from distal
arthrogryposis type 5 families) make PIEZO2-dependent currents recover
faster from inactivation, and E2727del also slows inactivation, so the
channel passes more current for a given mechanical stimulus. Mutant
channels are not constitutively open and are not toxic to cells. The
recurrent Gordon syndrome variant p.Arg2686His is treated as acting the
same way by inference from these alleles. The node name is shared with the
Marden-Walker syndrome entry because the lesion is the same.
genes:
- preferred_term: PIEZO2
term:
id: hgnc:26270
label: PIEZO2
genetic_context:
functional_impact_category: GAIN_OF_FUNCTION
variant_origin: GERMLINE
zygosity: HETEROZYGOUS
description: >-
Heterozygous germline variants, most often c.8057G>A (p.Arg2686His).
molecular_functions:
- preferred_term: mechanosensitive cation channel activity
term:
id: GO:0008381
label: mechanosensitive monoatomic ion channel activity
modifier: INCREASED
biological_processes:
- preferred_term: detection of mechanical stimulus
term:
id: GO:0050982
label: detection of mechanical stimulus
modifier: INCREASED
evidence:
- reference: PMID:23487782
reference_title: "Gain-of-function mutations in the mechanically activated ion channel PIEZO2 cause a subtype of Distal Arthrogryposis."
supports: SUPPORT
directness: INDIRECT
evidence_source: IN_VITRO
snippet: "both E2727del and I802F mutations cause the PIEZO2-dependent, mechanically activated currents to recover faster from inactivation, while E2727del also causes a slowing of inactivation."
explanation: >-
Patch-clamp characterization of two dominant PIEZO2 variants. Indirect
for Gordon syndrome because the alleles come from distal arthrogryposis
type 5 families.
- reference: PMID:23487782
reference_title: "Gain-of-function mutations in the mechanically activated ion channel PIEZO2 cause a subtype of Distal Arthrogryposis."
supports: SUPPORT
directness: INDIRECT
evidence_source: IN_VITRO
snippet: "We further show that overexpression of mutated PIEZO2 cDNAs does not cause constitutive activity or toxicity to cells, indicating that the observed phenotype is likely due to a mechanotransduction defect."
explanation: >-
Shows the defect is altered mechanotransduction rather than constitutive
opening or cytotoxicity.
- reference: PMID:27843126
reference_title: "Biallelic Loss of Proprioception-Related PIEZO2 Causes Muscular Atrophy with Perinatal Respiratory Distress, Arthrogryposis, and Scoliosis."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
quote_role: BACKGROUND
snippet: "In contrast, heterozygous gain-of-function missense mutations, mainly localized at the C terminus, cause dominant distal arthrogryposis 3 (DA3), distal arthrogryposis 5 (DA5), or Marden-Walker syndrome (MWKS), which encompass contractures of hands and feet, scoliosis, ophthalmoplegia, and ptosis."
explanation: >-
States that DA3 (Gordon syndrome) is caused by heterozygous
gain-of-function C-terminal PIEZO2 missense variants.
downstream:
- target: Excessive Mechanotransduction in Proprioceptive Sensory Neurons
causal_link_type: DIRECT
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "They also demonstrate that heterozygosity of GOF PIEZO2 is sufficient to increase mechanosensitivity in sensory neurons."
explanation: >-
In knock-in mice, one copy of a gain-of-function Piezo2 allele is
enough to raise mechanosensitivity in sensory neurons. Indirect because
the allele modelled is a distal arthrogryposis type 5 variant.
- target: Incomplete Secondary Palate Fusion
causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
description: >-
Cleft palate is associated with the recurrent p.Arg2686His variant. The
developmental route from PIEZO2 gain of function to failed palatal
closure is not described in the cited sources.
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The presence of cleft palate was significantly associated with c.8057G>A (Fisher's exact test, adjusted p value < 0.0001)."
explanation: >-
Allele-specific association between the Gordon syndrome variant and
cleft palate.
- target: Ptosis
causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
description: >-
Ptosis is reported across the dominant PIEZO2 spectrum; the mechanism
linking PIEZO2 gain of function to eyelid and extraocular involvement is
not established.
evidence:
- reference: PMID:27843126
reference_title: "Biallelic Loss of Proprioception-Related PIEZO2 Causes Muscular Atrophy with Perinatal Respiratory Distress, Arthrogryposis, and Scoliosis."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
quote_role: BACKGROUND
snippet: "In contrast, heterozygous gain-of-function missense mutations, mainly localized at the C terminus, cause dominant distal arthrogryposis 3 (DA3), distal arthrogryposis 5 (DA5), or Marden-Walker syndrome (MWKS), which encompass contractures of hands and feet, scoliosis, ophthalmoplegia, and ptosis."
explanation: >-
Names ptosis among the features of the dominant PIEZO2 disorders,
including DA3.
- target: Dandy-Walker malformation
causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
description: >-
Posterior fossa malformation in PIEZO2-positive patients suggests a role
for PIEZO2 in hindbrain development; the mechanism is unknown and the
association rests on few cases.
evidence:
- reference: PMID:36588752
reference_title: "Further Evidence of a Continuum in the Clinical Spectrum of Dominant PIEZO2-Related Disorders and Implications in Cerebellar Anomalies."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The association of DWM with arthrogryposis in the presence of PIEZO2 variants remains quite interesting and provides more evidence that PIEZO2 plays a role in the development of hindbrain although the underlying mechanism remains unclear."
explanation: >-
The authors connect PIEZO2 variants to hindbrain malformation while
stating the mechanism is unclear.
- name: Incomplete Secondary Palate Fusion
biological_scale: TISSUE
role: consequence
mechanism_confidence: PROVISIONAL
description: >-
Failure of the secondary palate to close completely, giving cleft palate
or its minor form, bifid uvula. In Gordon syndrome this is the least often
expressed element of the classic triad and is significantly associated
with the recurrent p.Arg2686His variant. How altered PIEZO2
mechanotransduction affects palatal shelf development is not known; the
node is PROVISIONAL because the link to PIEZO2 is a genotype-phenotype
association rather than a demonstrated mechanism.
locations:
- preferred_term: secondary palate
term:
id: UBERON:0001716
label: secondary palate
biological_processes:
- preferred_term: secondary palate development
term:
id: GO:0062009
label: secondary palate development
modifier: ABNORMAL
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The presence of cleft palate was significantly associated with c.8057G>A (Fisher's exact test, adjusted p value < 0.0001)."
explanation: Allele-specific association with cleft palate.
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here, we present a family with three affected individuals exhibiting multiple contractures (metacarpo-phalangeal and interphalangeal joints as well as elbow, shoulder, knee, and ankle joints), clubfeet, short stature, bifid uvula/cleft palate, and a distinct facial phenotype including ptosis."
explanation: Bifid uvula or cleft palate in a PIEZO2-positive family.
downstream:
- target: Cleft palate
- target: Bifid uvula
- name: Excessive Mechanotransduction in Proprioceptive Sensory Neurons
biological_scale: CELLULAR
role: central_effector
mechanism_confidence: PROVISIONAL
description: >-
PIEZO2 is the principal mechanotransduction channel of proprioceptive
sensory neurons, which innervate muscle spindles and tendon organs. In mice,
expressing a gain-of-function Piezo2 allele only in these neurons is
sufficient to reproduce the limb contractures, whereas expressing it only
in limb mesenchyme (muscle, cartilage and tendon) is not. The effect
depends on neuronal activity during a postnatal developmental window, and
botulinum toxin, but not motor-endplate blockade with alpha-bungarotoxin,
prevents it. The authors interpret this as an efferent action of the
afferent nerve endings, likely through increased exocytosis, rather than
increased reflex motor drive; stretch-evoked muscle spindle afferent firing
was not increased ex vivo. The node is PROVISIONAL because the evidence
is from a mouse carrying a distal arthrogryposis type 5 allele, not the
Gordon syndrome variant.
cell_types:
- preferred_term: proprioceptive sensory neuron
term:
id: CL:1001451
label: sensory neuron of dorsal root ganglion
locations:
- preferred_term: muscle spindle
term:
id: UBERON:0003718
label: muscle spindle
biological_processes:
- preferred_term: detection of mechanical stimulus
term:
id: GO:0050982
label: detection of mechanical stimulus
modifier: INCREASED
evidence:
- reference: PMID:27843126
reference_title: "Biallelic Loss of Proprioception-Related PIEZO2 Causes Muscular Atrophy with Perinatal Respiratory Distress, Arthrogryposis, and Scoliosis."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
quote_role: BACKGROUND
snippet: "PIEZO2 encodes a mechanosensitive ion channel that plays a major role in light-touch mechanosensation and has recently been identified as the principal mechanotransduction channel for proprioception."
explanation: Identifies the proprioceptive neuron as the main cellular site of PIEZO2 function.
- reference: PMID:27184818
reference_title: "A critical role for Piezo2 channels in the mechanotransduction of mouse proprioceptive neurons."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "The data clearly shows that Piezo2 fulfills a critical role in a defined homogeneous population of proprioceptor neurons that innervate the head muscles, demonstrating that this ion channel is essential for mammalian proprioceptive mechanotransduction."
explanation: >-
Conditional deletion in mice shows PIEZO2 carries the mechanically
activated current of proprioceptive neurons, the cell type whose
overactivity this node describes.
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "We show that expression of a gain-of-function PIEZO2 mutation in proprioceptive sensory neurons that mainly innervate muscle spindles and tendons is sufficient to induce DA5-like phenotypes in mice."
explanation: >-
Cell-type-restricted expression locates the pathogenic action in
proprioceptive sensory neurons.
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "Together, our pharmacological experiments suggest that GOF PIEZO2 causes musculoskeletal abnormalities via ectopic efferent activity in afferent peripheral mechanosensory neuronal endings, likely involving increased levels of exocytosis."
explanation: >-
The proposed cellular mechanism: efferent activity of the afferent
endings, most likely increased exocytosis.
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "This implies that motor activity does not play a major role in DA5 like deficits."
explanation: >-
Motor-endplate blockade did not rescue the defects, arguing against
increased reflex motor drive as the route.
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "We found that muscle spindle afferent activity in response to stretch is not significantly different between wild type and GOF Piezo2 mice at P7 postnatal stage"
explanation: >-
Afferent firing was unchanged, which is why the node is framed as excess
mechanotransduction acting locally at the endings rather than as
increased proprioceptive signalling.
downstream:
- target: Tendon Shortening and Disrupted Musculoskeletal Development
causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
description: >-
The signal released from overactive sensory endings that alters tendon
and joint development has not been identified.
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "Our study has identified a critical postnatal period during development when relatively small excess PIEZO2 activity in somatosensory neurons can cause tendon deficits and severe joint contractures."
explanation: >-
Links excess PIEZO2 activity in sensory neurons to tendon deficits
during a developmental window.
- name: Tendon Shortening and Disrupted Musculoskeletal Development
biological_scale: TISSUE
role: central_effector
mechanism_confidence: PROVISIONAL
description: >-
In gain-of-function Piezo2 mice the hindlimb tendons are shorter than in
wild-type littermates, and the authors propose that shortened tendons
produce the contractures. Proprioceptive nerve endings and muscle fiber
diameters looked normal, so the defect is in tendon and joint development
rather than in sensory-ending formation or muscle growth. Mouse-derived;
tendon length has not been measured in people with Gordon syndrome in the
cited sources.
locations:
- preferred_term: tendon
term:
id: UBERON:0000043
label: tendon
biological_processes:
- preferred_term: tendon development
term:
id: GO:0035989
label: tendon development
modifier: ABNORMAL
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "we observed that the average length of tendons was significantly reduced in GOFconst. mice compared to wild type"
explanation: Measured tendon shortening in the gain-of-function mouse.
downstream:
- target: Congenital Distal Joint Contractures
causal_link_type: DIRECT
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "It is therefore possible that the DA5-like contractures are caused by shortened tendons."
explanation: >-
The authors propose tendon shortening as the cause of the contractures;
stated as a possibility, not demonstrated.
- name: Congenital Distal Joint Contractures
biological_scale: TISSUE
role: consequence
mechanism_confidence: ESTABLISHED
description: >-
The defining lesion: fixed contractures present from birth, chiefly at the
finger joints (camptodactyly) and feet (clubfoot), sometimes extending to
elbows, shoulders, knees and ankles. Contractures can be detected on
prenatal ultrasound from the first trimester. The spinal curve seen in some
patients has the characteristics of an arthrogrypotic neuromuscular curve.
locations:
- preferred_term: hand
term:
id: UBERON:0002398
label: manus
- preferred_term: foot
term:
id: UBERON:0002387
label: pes
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Gordon syndrome (GS), or distal arthrogryposis type 3, is a rare, autosomal-dominant disorder characterized by cleft palate and congenital contractures of the hands and feet."
explanation: Congenital hand and foot contractures define the disorder.
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here, we present a family with three affected individuals exhibiting multiple contractures (metacarpo-phalangeal and interphalangeal joints as well as elbow, shoulder, knee, and ankle joints), clubfeet, short stature, bifid uvula/cleft palate, and a distinct facial phenotype including ptosis."
explanation: Documents distal and large-joint contractures in a PIEZO2-positive family.
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
directness: INDIRECT
evidence_source: MODEL_ORGANISM
snippet: "We observed that hindlimbs of the transgenic mice had contractures compared to wild type littermates"
explanation: The gain-of-function mouse reproduces distal limb contractures.
downstream:
- target: Distal arthrogryposis
- target: Camptodactyly of fingers
- target: Clubfoot
- target: Large-joint contractures
- target: Scoliosis
causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
evidence:
- reference: PMID:11718203
reference_title: "Scoliosis in Gordon's syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Scoliosis in Gordon's Syndrome shares the characteristics of an arthrogrypotic neuromuscular curve and demands extensive soft tissue release for optimal correction."
explanation: >-
Characterizes the spinal curve as arthrogrypotic, placing it downstream
of the contracture process.
phenotypes:
- category: Musculoskeletal
name: Distal arthrogryposis
description: >-
Congenital contractures of the hands and feet, the defining feature of the
disorder.
phenotype_term:
preferred_term: Distal arthrogryposis
term:
id: HP:0005684
label: Distal arthrogryposis
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Gordon syndrome (GS), or distal arthrogryposis type 3, is a rare, autosomal-dominant disorder characterized by cleft palate and congenital contractures of the hands and feet."
explanation: Defines the disorder by congenital hand and foot contractures.
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "Gordon syndrome, also known as distal arthrogryposis type 3, is an extremely rare multiple congenital malformation syndrome characterized by congenital contractures of hand and feet with variable degrees of severity of camptodactyly, clubfoot and, less frequently, cleft palate."
explanation: Orphanet definition of the disorder.
- category: Musculoskeletal
name: Camptodactyly of fingers
description: >-
Fixed flexion contractures of the fingers, present in most affected people.
frequency: VERY_FREQUENT
phenotype_term:
preferred_term: Camptodactyly of finger
term:
id: HP:0100490
label: Camptodactyly of finger
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0100490 | Camptodactyly of finger | Very frequent (99-80%)"
explanation: Orphanet grades camptodactyly as very frequent.
- reference: PMID:11718203
reference_title: "Scoliosis in Gordon's syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
quote_role: BACKGROUND
snippet: "Gordon's Syndrome is described as an autosomal dominant condition with the characteristics of short stature, a stiff spine, camptodactyly (89%), cleft palate (27%) and club feet (73%)."
explanation: Literature-derived frequency of camptodactyly (89%).
- category: Musculoskeletal
name: Clubfoot
description: >-
Congenital clubfoot. A literature summary gives 73%; Orphanet grades talipes
as very frequent. The lower literature figure is used for the frequency.
frequency: FREQUENT
phenotype_term:
preferred_term: Clubfoot
term:
id: HP:0001762
label: Talipes equinovarus
evidence:
- reference: PMID:11718203
reference_title: "Scoliosis in Gordon's syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
quote_role: BACKGROUND
snippet: "Gordon's Syndrome is described as an autosomal dominant condition with the characteristics of short stature, a stiff spine, camptodactyly (89%), cleft palate (27%) and club feet (73%)."
explanation: Literature-derived frequency of club feet (73%).
- reference: PMID:37587573
reference_title: "A novel PIEZO2 mutation in a fetus from a Chinese family with Gordon syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "We describe a fetus from a Chinese family whose parents were both healthy but showed multiple malformations, including clubfoot, camptodactyly, micrognathia, and cleft palate."
explanation: Clubfoot in a PIEZO2-positive fetus.
- category: Musculoskeletal
name: Large-joint contractures
description: >-
Contractures beyond the hands and feet, at the elbows, shoulders, knees and
ankles, are reported in some families.
frequency: OCCASIONAL
phenotype_term:
preferred_term: Limitation of joint mobility
term:
id: HP:0001376
label: Limitation of joint mobility
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0001376 | Limitation of joint mobility | Occasional (29-5%)"
explanation: Orphanet grades limitation of joint mobility as occasional.
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here, we present a family with three affected individuals exhibiting multiple contractures (metacarpo-phalangeal and interphalangeal joints as well as elbow, shoulder, knee, and ankle joints), clubfeet, short stature, bifid uvula/cleft palate, and a distinct facial phenotype including ptosis."
explanation: Elbow, shoulder, knee and ankle contractures in a PIEZO2-positive family.
- category: Musculoskeletal
name: Scoliosis
description: >-
Scoliosis or a stiff spine, which can become a complex deformity requiring
surgery.
frequency: OCCASIONAL
phenotype_term:
preferred_term: Scoliosis
term:
id: HP:0002650
label: Scoliosis
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0002650 | Scoliosis | Occasional (29-5%)"
explanation: Orphanet grades scoliosis as occasional.
- reference: PMID:11718203
reference_title: "Scoliosis in Gordon's syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The authors present a case report of a patient with this rare entity complicated by an unusual complex spinal deformity."
explanation: Case report of complex spinal deformity in Gordon syndrome.
- category: Craniofacial
name: Cleft palate
description: >-
Cleft palate, the least often expressed element of the classic triad, is
significantly associated with the recurrent p.Arg2686His variant.
frequency: OCCASIONAL
phenotype_term:
preferred_term: Cleft palate
term:
id: HP:0000175
label: Cleft palate
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0000175 | Cleft palate | Occasional (29-5%)"
explanation: Orphanet grades cleft palate as occasional.
- reference: PMID:11718203
reference_title: "Scoliosis in Gordon's syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
quote_role: BACKGROUND
snippet: "Gordon's Syndrome is described as an autosomal dominant condition with the characteristics of short stature, a stiff spine, camptodactyly (89%), cleft palate (27%) and club feet (73%)."
explanation: Literature-derived frequency of cleft palate (27%).
- reference: PMID:458832
reference_title: "Camptodactyly, cleft palate, and club foot (the Gordon syndrome). A report of a large pedigree."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Penetrance appears to be more reduced in females than in males, and cleft palate is the least frequently manifested trait."
explanation: Cleft palate is the least often expressed component in a large pedigree.
- category: Craniofacial
name: High palate
description: >-
A high-arched palate, reported more often than overt clefting.
frequency: FREQUENT
phenotype_term:
preferred_term: High palate
term:
id: HP:0000218
label: High palate
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0000218 | High palate | Frequent (79-30%)"
explanation: Orphanet grades high palate as frequent.
- category: Craniofacial
name: Bifid uvula
description: >-
Bifid uvula, a minor form of palatal clefting, reported with cleft palate in
a PIEZO2-positive family.
phenotype_term:
preferred_term: Bifid uvula
term:
id: HP:0000193
label: Bifid uvula
evidence:
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here, we present a family with three affected individuals exhibiting multiple contractures (metacarpo-phalangeal and interphalangeal joints as well as elbow, shoulder, knee, and ankle joints), clubfeet, short stature, bifid uvula/cleft palate, and a distinct facial phenotype including ptosis."
explanation: Reports bifid uvula or cleft palate in the family.
- category: Craniofacial
name: Micrognathia
description: >-
Small mandible, noted in some individuals and detected prenatally.
phenotype_term:
preferred_term: Micrognathia
term:
id: HP:0000347
label: Micrognathia
evidence:
- reference: PMID:37587573
reference_title: "A novel PIEZO2 mutation in a fetus from a Chinese family with Gordon syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "We describe a fetus from a Chinese family whose parents were both healthy but showed multiple malformations, including clubfoot, camptodactyly, micrognathia, and cleft palate."
explanation: Micrognathia in a PIEZO2-positive fetus.
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "Intelligence is normal but in some cases, additional abnormalities, such as short stature, kyphoscoliosis, ptosis, micrognathia, and cryptorchidism may also be present."
explanation: Orphanet lists micrognathia among the variable additional features.
- category: Craniofacial
name: Limited mouth opening
description: >-
Restricted mouth opening, which complicates dental care; in one reported
adolescent it was accompanied by enlarged coronoid processes of the
mandible.
phenotype_term:
preferred_term: Limited mouth opening
term:
id: HP:0000211
label: Trismus
evidence:
- reference: PMID:34038001
reference_title: "Gordon syndrome: Dental implications and a case report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "He had a significant limitation of mouth opening (2 cm at incisors)."
explanation: Documents restricted mouth opening in a patient with Gordon syndrome.
- category: Ophthalmologic
name: Ptosis
description: >-
Drooping of the upper eyelid, present in some individuals.
phenotype_term:
preferred_term: Ptosis
term:
id: HP:0000508
label: Ptosis
evidence:
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Here, we present a family with three affected individuals exhibiting multiple contractures (metacarpo-phalangeal and interphalangeal joints as well as elbow, shoulder, knee, and ankle joints), clubfeet, short stature, bifid uvula/cleft palate, and a distinct facial phenotype including ptosis."
explanation: Ptosis in a PIEZO2-positive family.
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "Intelligence is normal but in some cases, additional abnormalities, such as short stature, kyphoscoliosis, ptosis, micrognathia, and cryptorchidism may also be present."
explanation: Orphanet lists ptosis among the variable additional features.
- category: Growth
name: Short stature
description: >-
Short stature, which with cleft palate distinguishes Gordon syndrome from
other distal arthrogryposes.
frequency: OCCASIONAL
phenotype_term:
preferred_term: Short stature
term:
id: HP:0004322
label: Short stature
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0004322 | Short stature | Occasional (29-5%)"
explanation: Orphanet grades short stature as occasional.
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "It is distinguishable from other forms of distal arthrogryposis by cleft palate and short stature."
explanation: Short stature as a distinguishing feature.
- category: Musculoskeletal
name: Pectus excavatum
frequency: OCCASIONAL
phenotype_term:
preferred_term: Pectus excavatum
term:
id: HP:0000767
label: Pectus excavatum
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0000767 | Pectus excavatum | Occasional (29-5%)"
explanation: Orphanet grades pectus excavatum as occasional.
- reference: PMID:8370149
reference_title: "Distal arthrogryposis with autosomal dominant inheritance and reduced penetrance in females: the Gordon syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A family is reported in which camptodactyly, club foot, pectus excavatum and undescended testes are transmitted as an autosomal dominant with reduced penetrance and variable expressivity, affecting 13 members through five generations."
explanation: Pectus excavatum segregating in a five-generation family.
- category: Genitourinary
name: Cryptorchidism
frequency: OCCASIONAL
phenotype_term:
preferred_term: Cryptorchidism
term:
id: HP:0000028
label: Cryptorchidism
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0000028 | Cryptorchidism | Occasional (29-5%)"
explanation: Orphanet grades cryptorchidism as occasional.
- reference: PMID:8370149
reference_title: "Distal arthrogryposis with autosomal dominant inheritance and reduced penetrance in females: the Gordon syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A family is reported in which camptodactyly, club foot, pectus excavatum and undescended testes are transmitted as an autosomal dominant with reduced penetrance and variable expressivity, affecting 13 members through five generations."
explanation: Undescended testes segregating in a five-generation family.
- category: Musculoskeletal
name: Decreased muscle mass
description: >-
Reduced muscle bulk. In the gain-of-function mouse, muscle fiber diameters
were normal, so this feature is not attached to the sensory-neuron chain.
frequency: FREQUENT
phenotype_term:
preferred_term: Decreased muscle mass
term:
id: HP:0003199
label: Decreased muscle mass
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0003199 | Decreased muscle mass | Frequent (79-30%)"
explanation: Orphanet grades decreased muscle mass as frequent.
- category: Otolaryngologic
name: Hearing impairment
frequency: OCCASIONAL
phenotype_term:
preferred_term: Hearing impairment
term:
id: HP:0000365
label: Hearing impairment
evidence:
- reference: ORPHA:376
supports: SUPPORT
evidence_source: OTHER
snippet: "HP:0000365 | Hearing impairment | Occasional (29-5%)"
explanation: Orphanet grades hearing impairment as occasional.
- category: Neurologic
name: Dandy-Walker malformation
description: >-
Posterior fossa malformation reported in a girl with typical Gordon
syndrome and the recurrent p.Arg2686His variant, as in some individuals
with Marden-Walker syndrome. A single case, so no frequency is given.
phenotype_term:
preferred_term: Dandy-Walker malformation
term:
id: HP:0001305
label: Dandy-Walker malformation
evidence:
- reference: PMID:36588752
reference_title: "Further Evidence of a Continuum in the Clinical Spectrum of Dominant PIEZO2-Related Disorders and Implications in Cerebellar Anomalies."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The brain MRI of the 2 patients showed Dandy-Walker malformation (DWM)."
explanation: >-
One of the two patients with Dandy-Walker malformation had typical
Gordon syndrome with p.Arg2686His.
- category: Neurologic
name: Mild intellectual disability
description: >-
Intelligence is usually normal. Mild intellectual disability and
psychomotor delay were reported in one three-generation family carrying
p.Arg2686His, whose authors suggest it may belong to the phenotypic
spectrum. Recorded with a contrary item because the Orphanet definition
states that intelligence is normal.
phenotype_term:
preferred_term: Mild intellectual disability
term:
id: HP:0001256
label: Mild intellectual disability
evidence:
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Our analysis indicated that mild delay in psychomotor development and intellectual disability could be part of the phenotypic spectrum of Gordon syndrome."
explanation: Mild intellectual disability in one PIEZO2-positive family.
- reference: ORPHA:376
supports: REFUTE
evidence_source: OTHER
snippet: "Intelligence is normal but in some cases, additional abnormalities, such as short stature, kyphoscoliosis, ptosis, micrognathia, and cryptorchidism may also be present."
explanation: Orphanet describes intelligence as normal in Gordon syndrome.
diagnosis:
- name: Prenatal ultrasound with genetic testing
description: >-
Contractures and clubfoot can be seen on fetal ultrasound, from as early as
13 weeks of gestation in one family, and the diagnosis is confirmed by
finding a heterozygous PIEZO2 variant.
diagnosis_term:
preferred_term: fetal ultrasound
term:
id: NCIT:C17230
label: Ultrasound Imaging
evidence:
- reference: PMID:37587573
reference_title: "A novel PIEZO2 mutation in a fetus from a Chinese family with Gordon syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A prenatal diagnosis of GS can be established by fetal ultrasound examination combined with genetic testing."
explanation: States the prenatal diagnostic approach.
- reference: PMID:27714920
reference_title: "Familial Gordon syndrome associated with a PIEZO2 mutation."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "a male neonate showing typical signs of arthrogryposis in the prenatal ultrasound examination already seen at 13 week of gestation"
explanation: Arthrogryposis visible on first-trimester ultrasound.
- name: PIEZO2 sequencing
description: >-
Exome or targeted sequencing of PIEZO2. Most families carry c.8057G>A
(p.Arg2686His), but in a minority of clinically diagnosed families no
PIEZO2 variant was found.
diagnosis_term:
preferred_term: exome sequencing
term:
id: NCIT:C101295
label: Whole Exome Sequencing
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Sanger sequencing revealed PIEZO2 mutations in five of seven additional families studied (for a total of 10/12 [83%] individuals), and nine families had an identical c.8057G>A (p.Arg2686His) mutation."
explanation: Yield of PIEZO2 sequencing in clinically diagnosed families.
differential_diagnoses:
- name: Distal arthrogryposis type 5
description: >-
Allelic PIEZO2 disorder with contractures plus ophthalmoplegia and
restrictive lung disease. Its distinction from Gordon syndrome is less
clear than that of Marden-Walker syndrome, and both may be variable
expressions of one condition.
disease_term:
preferred_term: distal arthrogryposis type 5
term:
id: MONDO:0007158
label: arthrogryposis- oculomotor limitation-electroretinal anomalies syndrome
evidence:
- reference: PMID:36588752
reference_title: "Further Evidence of a Continuum in the Clinical Spectrum of Dominant PIEZO2-Related Disorders and Implications in Cerebellar Anomalies."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Out of these, MWS has a recognizable phenotype that can be discerned easily, but the distinction between GS and DA5 is less evident."
explanation: Gordon syndrome and DA5 are hard to separate clinically.
- reference: PMID:41572728
reference_title: "Expanding the Genotype-Phenotype Correlation of Marden-Walker Syndrome due to PIEZO2 Gene Variants: A Case Report From Brazil."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A review of individuals with the same PIEZO2 variant demonstrates marked phenotypic variability-from Gordon syndrome to distal arthrogryposis type 5-underscoring allelic heterogeneity and variable expressivity."
explanation: >-
Carriers of one PIEZO2 variant range from Gordon syndrome to DA5, so the
clinical label does not map one-to-one onto the allele.
- name: Marden-Walker syndrome
description: >-
Severe end of the dominant PIEZO2 spectrum, with mask-like face,
blepharophimosis, developmental delay and multiple contractures; also
genetically heterogeneous.
disease_term:
preferred_term: Marden-Walker syndrome
term:
id: MONDO:0009564
label: Marden-Walker syndrome
evidence:
- reference: PMID:24726473
reference_title: "Mutations in PIEZO2 cause Gordon syndrome, Marden-Walker syndrome, and distal arthrogryposis type 5."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Collectively, although GS, DA5, and MWS have traditionally been considered separate disorders, our findings indicate that they are etiologically related and perhaps represent variable expressivity of the same condition."
explanation: Places Marden-Walker syndrome on the same etiological spectrum.
- name: Arthrogryposis, distal, with impaired proprioception and touch
description: >-
Recessive PIEZO2 loss-of-function disorder: arthrogryposis with muscular
atrophy, scoliosis, progressive contractures and loss of proprioception and
touch. Same gene, opposite channel effect and inheritance.
disease_term:
preferred_term: distal arthrogryposis with impaired proprioception and touch
term:
id: MONDO:0014941
label: arthrogryposis, distal, with impaired proprioception and touch
evidence:
- reference: PMID:27607563
reference_title: "Loss of the proprioception and touch sensation channel PIEZO2 in siblings with a progressive form of contractures."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Recessive mutations in PIEZO2 thus appear to cause a progressive phenotype that overlaps with, while being mostly distinct from that associated with dominant mutations in the same gene."
explanation: Distinguishes the recessive loss-of-function phenotype from the dominant one.
- name: Aase-Smith syndrome
description: >-
Distal arthrogryposis with cleft palate; one family showed clinical overlap
with Gordon syndrome.
disease_term:
preferred_term: Aase-Smith syndrome
term:
id: MONDO:0007839
label: Aase-Smith syndrome
evidence:
- reference: PMID:11152147
reference_title: "A family with distal arthrogryposis and cleft palate: possible overlap between Gordon syndrome and Aase-Smith syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "We report a family with distal arthrogryposis and cleft palate which demonstrates the clinical overlap between Gordon syndrome and Aase-Smith syndrome."
explanation: Documents clinical overlap with Aase-Smith syndrome.
treatments:
- name: Orthopedic surgery for contractures and spinal deformity
description: >-
Surgical correction of clubfoot and contractures, and of scoliosis when
present. The spinal curve behaves like an arthrogrypotic neuromuscular
curve and needs extensive soft tissue release for correction. No
disease-specific therapy exists.
therapeutic_modality: SURGERY
treatment_term:
preferred_term: orthopedic surgical procedure
term:
id: NCIT:C16186
label: Orthopedic Surgical Procedure
target_phenotypes:
- preferred_term: Scoliosis
term:
id: HP:0002650
label: Scoliosis
evidence:
- reference: PMID:11718203
reference_title: "Scoliosis in Gordon's syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Scoliosis in Gordon's Syndrome shares the characteristics of an arthrogrypotic neuromuscular curve and demands extensive soft tissue release for optimal correction."
explanation: Surgical guidance from a case of scoliosis in Gordon syndrome.
- reference: PMID:33104047
reference_title: "A review of the orthopedic interventions and functional outcomes among a cohort of 114 children with arthrogryposis multiplex congenita."
supports: SUPPORT
directness: INDIRECT
evidence_source: HUMAN_CLINICAL
snippet: "In terms of walking ability, 98% of participants with DA were independent ambulators."
explanation: >-
Functional outcome after orthopedic management in a distal arthrogryposis
cohort. Indirect because the cohort pools distal arthrogryposis types and
does not report Gordon syndrome separately.
- name: Dental management adapted to limited mouth opening
description: >-
Limited mouth opening and impaired manual dexterity make oral hygiene
difficult; management relies on individualized home care and regular
dental review, with extractions and restorations possible under local
anaesthesia.
therapeutic_modality: OTHER
treatment_term:
preferred_term: dental care
term:
id: NCIT:C38052
label: Dental Procedure
target_phenotypes:
- preferred_term: Limited mouth opening
term:
id: HP:0000211
label: Trismus
evidence:
- reference: PMID:34038001
reference_title: "Gordon syndrome: Dental implications and a case report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Dental management should focus on ensuring that the patient is able to maintain good oral hygiene by customising homecare for the individual and regular dental visits."
explanation: Dental management recommendations for Gordon syndrome.
animal_models:
- name: Gain-of-function Piezo2 E2799del knock-in mouse
species: Mouse
genotype: Piezo2 E2799del (equivalent of human PIEZO2 E2727del), Cre-dependent knock-in, heterozygous
publication: PMID:36634173
description: >-
Mouse carrying the mouse equivalent of the human distal arthrogryposis
type 5 variant E2727del, expressed constitutively or restricted by Cre
driver to proprioceptive neurons (Pvalb), all sensory neurons (Advillin,
inducible) or limb mesenchyme (Prrx1). Constitutive and
proprioceptor-restricted mice develop hindlimb contractures and shortened tendons;
mesenchyme-restricted mice do not. Botulinum toxin injected into the
hindlimb at postnatal days 7 to 10, or a maternal diet enriched in
eicosapentaenoic acid, which shortens PIEZO2 inactivation, reduced the
defects.
modeled_mechanisms:
- target: Excessive Mechanotransduction in Proprioceptive Sensory Neurons
relationship: RECAPITULATES
fidelity: MODERATE
description: >-
Shows that gain-of-function PIEZO2 acting in proprioceptive sensory
neurons, not in limb mesenchyme, is sufficient for the contractures.
limitations: >-
Models a distal arthrogryposis type 5 allele (E2727del), not the
Gordon syndrome variant p.Arg2686His. The sensitive window was postnatal
days 7 to 21 in the mouse, whereas human contractures are present at
birth.
divergences:
- divergence_type: POPULATION_MISMATCH
materiality: QUALIFYING
description: >-
The engineered allele is the DA5 variant E2727del. Gordon syndrome
families mostly carry p.Arg2686His, which has not been modelled, so the
mechanism is transferred across alleles of the same gene.
- divergence_type: TEMPORAL_SCOPE
materiality: QUALIFYING
description: >-
The critical window identified is postnatal in mice; whether it maps
onto fetal development in humans, where contractures are congenital,
is not tested.
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "These data suggest that overactive PIEZO2 in sensory neurons, but not in mesenchyme, is sufficient to induce DA5-like phenotypes in vivo."
explanation: Cell-type-restricted expression places the mechanism in sensory neurons.
- target: Tendon Shortening and Disrupted Musculoskeletal Development
relationship: RECAPITULATES
fidelity: MODERATE
description: Reproduces tendon shortening in the hindlimb.
limitations: >-
Mouse hindlimb only; forelimbs were too small to quantify. Tendon length
has not been measured in people with Gordon syndrome in the cited
sources.
readouts:
- name: Hindlimb tendon length
target: Tendon Shortening and Disrupted Musculoskeletal Development
direction: DECREASED
interpretation: Tendons shorter than in wild-type littermates.
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "we observed that the average length of tendons was significantly reduced in GOFconst. mice compared to wild type"
explanation: The tendon-length measurement behind this readout.
- target: Congenital Distal Joint Contractures
relationship: PARTIALLY_RECAPITULATES
fidelity: MODERATE
description: >-
Reproduces distal hindlimb contractures and reduced limb function, and
shows that early intervention reduces them.
limitations: >-
Contractures arise postnatally in the mouse. Palate, stature and
ocular features are not among the reported readouts, so the model
covers the limb component of the disorder only.
readouts:
- name: Hindlimb phalange-metacarpal joint angle
target: Congenital Distal Joint Contractures
direction: DECREASED
interpretation: Smaller joint angles indicate contracture.
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "phalange-metacarpal angles in hindlimbs of GOFconst. mice were significantly decreased compared to wild type mice"
explanation: The joint-angle measurement behind this readout.
- name: Joint and tendon defects after intramuscular botulinum toxin
target: Congenital Distal Joint Contractures
direction: RESTORED
interpretation: >-
A single injection at postnatal days 7 to 10 rescued joint and tendon
defects in the injected limb.
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Meanwhile, it rescued joint and tendon defects in the hindlimb that received the treatment in GOF Piezo2 mice compared to hindlimb injected with vehicle control"
explanation: Botulinum toxin rescue of the contracture readout.
- name: Joint malformation after maternal dietary eicosapentaenoic acid
target: Congenital Distal Joint Contractures
direction: RESTORED
interpretation: Partial prevention of joint malformations.
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Finally, we observed that dietary EPA partially prevented joint malformations"
explanation: Dietary EPA partial rescue of the contracture readout.
discussions:
- discussion_id: gordon_sensory_neuron_mechanism_translation
prompt: >-
Does the Gordon syndrome variant p.Arg2686His act through the same
proprioceptive-neuron efferent mechanism shown for a distal arthrogryposis
type 5 allele in mice, and is there a corresponding developmental window in
humans during which reducing PIEZO2 activity would prevent contractures?
kind: HUMAN_MODEL_MISMATCH
status: OPEN
attaches_to:
- pathophysiology#Excessive Mechanotransduction in Proprioceptive Sensory Neurons
- animal_models#Gain-of-function Piezo2 E2799del knock-in mouse
rationale: >-
The sensory-neuron mechanism and the botulinum toxin and EPA rescues come
from a mouse carrying the DA5 allele E2727del, with a postnatal critical
window. Gordon syndrome is mostly caused by p.Arg2686His, which has not
been electrophysiologically characterized or modelled in the cited
sources, and its contractures are present before birth. Whether the
mechanism and the window transfer decides whether the mouse rescues have
any bearing on Gordon syndrome.
evidence:
- reference: PMID:36634173
reference_title: "Excessive mechanotransduction in sensory neurons causes joint contractures."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "We also present proof-of-concept that Botox injection or dietary treatment can counteract the effect of overactive PIEZO2 function to evade DA-like phenotypes in mice when applied during a developmental critical period."
explanation: The rescue is shown in mice and only within a developmental window.
notes: >-
Scope. This entry covers Gordon syndrome (distal arthrogryposis type 3,
MONDO:0007252, OMIM:114300, ORPHA:376). Distal arthrogryposis type 5
(MONDO:0007158) and Marden-Walker syndrome (MONDO:0009564) are allelic
PIEZO2 disorders that McMillin et al. (PMID:24726473) suggest may be one
condition with variable expressivity. MONDO keeps all three as separate
concepts; Marden-Walker syndrome has its own entry and DA5 has a separate
curation stub, so neither is folded in here as a subtype. Both are listed
as differential diagnoses. The first pathophysiology node uses the same
name as the Marden-Walker syndrome entry because the molecular lesion is the
same.
Name collision. "Gordon syndrome" is also an eponym for pseudohypoaldosteronism
type 2 (familial hyperkalemic hypertension, MONDO:0019162; WNK1, WNK4,
KLHL3, CUL3), an unrelated renal tubular disorder. A literature search for
"Gordon syndrome" returns papers on both, and none of the
pseudohypoaldosteronism papers are used here. A 2024 osteopathic case report
(PMID:39559612) describes a patient with distal arthrogryposis features but
also attributes WNK and WNK4 mutations to her, mixing the two entities, so
it is not cited.
Loss of function is a different disorder. Biallelic PIEZO2 loss-of-function
variants cause a recessive arthrogryposis with muscular atrophy, perinatal
respiratory distress, scoliosis and impaired proprioception and touch
(MONDO:0014941, a separate curation stub). The opposite channel effect,
recessive inheritance and sensory loss distinguish it, so a PIEZO2 variant
found in a person with contractures needs zygosity and position before it
can be interpreted.
Other reports. Two people with Gordon syndrome and congenital myopathy, one
of whom had malignant hyperthermia, are reported in PMID:24878349; their
relationship to PIEZO2 is not established and these features are not
curated as phenotypes. No GeneReviews chapter covers Gordon syndrome.
Deep research results are used as seeds for research; they do not undergo the same validation as the main records and may contain errors. How we use deep research.
Create: Gordon_Syndrome · 2026-10-14T21:36:29Z · View source
Created the Gordon syndrome (distal arthrogryposis type 3, MONDO:0007252) entry and deleted its curation stub. Gene: PIEZO2 (hgnc:26270), heterozygous, with the recurrent c.8057G>A (p.Arg2686His) variant and a fetal nonsense variant of uncertain significance recorded under genetic.variants. Pathograph: PIEZO2 gain of function (molecular; node name shared with the Marden-Walker syndrome entry) leads to excess mechanotransduction in proprioceptive sensory neurons (cellular), then tendon shortening and disrupted musculoskeletal development (tissue), then congenital distal joint contractures, which point to the distal arthrogryposis, camptodactyly, clubfoot, large-joint contracture and scoliosis phenotypes. Separate branches from the PIEZO2 node reach an incomplete secondary palate fusion node (cleft palate, bifid uvula), ptosis and Dandy-Walker malformation; these edges rest on genotype-phenotype associations and are marked INDIRECT_UNKNOWN_INTERMEDIATES. The sensory-neuron and tendon nodes are PROVISIONAL because they come from a mouse carrying the DA5 allele E2727del, not the Gordon syndrome variant; that gap is recorded as a HUMAN_MODEL_MISMATCH discussion and as typed divergences on the animal model links. 9 of 18 phenotypes are causally connected; the rest (short stature, high palate, micrognathia, limited mouth opening, pectus excavatum, cryptorchidism, decreased muscle mass, hearing impairment, mild intellectual disability) have no sourced mechanism and are left unconnected. Scope: DA5 (MONDO:0007158, open stub) and Marden-Walker syndrome (existing entry) are kept as separate entries and listed as differential diagnoses, as is the recessive PIEZO2 loss-of-function disorder (MONDO:0014941, open stub). Notes record the eponym collision with pseudohypoaldosteronism type 2. Deep research: one OpenScientist report (research/Gordon_Syndrome-deep-research-openscientist.md). Reference validation 19/19 resolved, 0 off topic; term validation needs_review with 2 mislabelled terms (MONDO:0007252 and GO:0005886, both formatting artifacts). just preflight-dr returned PASS (PIEZO2 mentioned 66 times, OMIM 114300 matches). Errors found in the report on reading: it gives Orphanet as ORPHA:375 (the record is ORPHA:376), says Orphanet classes prevalence as below 1 in 1,000,000 (the Orphanet record says unknown), reports 10/12 GS families where the source says individuals, and offers CL:0000100 for proprioceptive sensory neuron, which is motor neuron in CL (term validation did not flag it because the report gave no label). None of these were carried into the entry; CL:1001451 (sensory neuron of dorsal root ganglion) is used instead. The report's statement that reduced fetal movement causes the contractures is not supported by its cited sources and was not used. Report citations not used: PMID:39147733 and PMID:35586339 (PIEZO2 lipid and cytoskeletal gating, not disease-specific), PMID:36317804 (lethal respiratory DA5, not Gordon syndrome), PMID:41531622 (recessive PIEZO2 duplications), PMID:38349741 (C. elegans DA5 allele; reproductive phenotypes with no Gordon syndrome counterpart). PMID:24878349 (congenital myopathy and malignant hyperthermia in two people with Gordon syndrome) is mentioned in notes only, because the relationship to PIEZO2 is not established. Literature found outside the report: PMID:7258227, 8370149, 458832, 27714920, 37587573, 36588752, 34038001, 11152147, 27607563, 28728825, and the Orphanet record ORPHA:376. PMID:39559612 was read and excluded because it attributes WNK1/WNK4 mutations to a patient with Gordon syndrome, mixing the arthrogryposis with pseudohypoaldosteronism type 2. No GeneReviews chapter exists (just check-genereviews --online: NO_CHAPTER). Validation: just validate passed, 84/84 snippets verified, validate-terms passed, entity refs, causal targets, duplicate keys, enum values, folded hyphens and block-scalar checks clean.
Disease: Gordon Syndrome (Distal Arthrogryposis type 3, DA3) MONDO ID: MONDO:0007252 · OMIM: #114300 · Category: Mendelian (monogenic, autosomal dominant) Causal gene: PIEZO2 (HGNC:26270) · Report date: 2026-10-14 · Evidence base: 32 papers reviewed, 7 confirmed findings.
Gordon Syndrome (GS), also called distal arthrogryposis type 3 (DA3), is a rare autosomal-dominant congenital contracture disorder. Its defining clinical triad is camptodactyly (permanently flexed fingers), talipes equinovarus (clubfoot), and cleft palate, usually accompanied by short stature and frequently by ptosis and a distinctive facies. GS is distinguished from the broader distal arthrogryposis family chiefly by the presence of cleft palate and short stature. The disease is caused by heterozygous gain-of-function (GoF) missense variants in PIEZO2 (18p11.22), the gene encoding the principal mechanically activated cation channel for proprioception and touch. A single recurrent variant, c.8057G>A / p.Arg2686His, accounts for the majority of molecularly confirmed families and is statistically associated with the cleft-palate phenotype that defines GS.
Mechanistically, GS is a channelopathy of mechanotransduction. The GoF variants, concentrated in the C-terminal pore/inactivation module of PIEZO2, alter channel inactivation kinetics so that the channel carries excess mechanically activated current. In proprioceptive sensory neurons that innervate muscle spindles and tendons, this excessive mechanotransduction during fetal/postnatal development produces neurogenic joint contractures. This causal chain is directly demonstrated in mice: expressing a GoF Piezo2 allele selectively in proprioceptors is sufficient to reproduce distal-arthrogryposis-like contractures, and the deficits are mitigated by botulinum toxin and by a PIEZO2-modulating dietary fatty acid. GS sits at one end of a continuous dominant PIEZO2 clinical spectrum that also includes distal arthrogryposis type 5 (DA5) and Marden-Walker syndrome (MWS); the same variant can produce different points on this spectrum, reflecting marked allelic heterogeneity and variable expressivity.
This report synthesizes evidence from exome-sequencing cohorts, biophysical electrophysiology, mouse and C. elegans models, and clinical case series to populate all 15 requested knowledge-base sections. Information is derived from aggregated disease-level resources (OMIM, Orphanet, published cohorts) rather than EHR-level individual-patient data. Where evidence is absent or not applicable (e.g., infectious agents, somatic variants, cancer survival statistics), this is stated explicitly.
Exome sequencing of five GS-affected families identified PIEZO2 mutations in every family, establishing PIEZO2 as the causal gene for Gordon syndrome (PMID: 24726473). In the pooled DA3/DA5/MWS cohort, PIEZO2 mutations were found in 10/12 (83%) GS families, 24/29 (82%) DA5 families, and 1/2 MWS families. Nine GS families carried the identical c.8057G>A (p.Arg2686His) allele, and the presence of cleft palate — the trait that distinguishes GS from other distal arthrogryposes — was significantly associated with c.8057G>A (Fisher's exact test, adjusted p < 0.0001). The study states: "Exome sequencing of five GS-affected families identified mutations in piezo-type mechanosensitive ion channel component 2 (PIEZO2) in each family" and "The presence of cleft palate was significantly associated with c.8057G>A (Fisher's exact test, adjusted p value < 0.0001)." This firmly links a specific recurrent allele to the GS phenotype.
Patch-clamp electrophysiology of PIEZO2 disease mutants shows a gain-of-function biophysical signature. Both the E2727del and I802F mutations cause the PIEZO2-dependent mechanically activated currents to recover faster from inactivation, and E2727del additionally slows inactivation — net effect, more channel activity for a given mechanical stimulus (PMID: 23487782): "both E2727del and I802F mutations cause the PIEZO2-dependent, mechanically activated currents to recover faster from inactivation, while E2727del also causes a slowing of inactivation." Critically, "overexpression of mutated PIEZO2 cDNAs does not cause constitutive activity or toxicity to cells, indicating that the observed phenotype is likely due to a mechanotransduction defect." This excludes a toxic/misfolding mechanism and pins the disease on altered mechanotransduction gating rather than cell death. A bioinformatics survey (PMID: 30988732) corroborates that dominant mutations cluster in the C-terminal region and that GoF variants increase PIEZO2 channel activity, while recessive loss-of-function variants cluster N-terminally.
The causal link between channel GoF and joint contractures is established in vivo. Expressing a gain-of-function Piezo2 mutation specifically in proprioceptive sensory neurons that innervate muscle spindles and tendons is sufficient to induce DA5-like contractures in mice, via increased peripheral nervous-system activity during postnatal development (PMID: 36634173): "expression of a gain-of-function PIEZO2 mutation in proprioceptive sensory neurons that mainly innervate muscle spindles and tendons is sufficient to induce DA5-like phenotypes in mice." Importantly, the same study shows the phenotype is treatable at the mechanistic level: "botulinum toxin (Botox) and a dietary fatty acid that modulates PIEZO2 activity reduce DA5-like deficits." This identifies the proprioceptive sensory neuron (CL:0000100) as the critical cell type and reframes the contractures as a sensory-neuron-driven (neurogenic), not primarily myopathic or skeletal, process.
Clinical cohort data quantify the core phenotype. Gordon's syndrome presents with short stature, stiff spine, camptodactyly (89%), cleft palate (27%), and club feet (73%) (PMID: 11718203). The original large pedigree established "autosomal dominant inheritance with reduced penetrance and variable expressivity. Penetrance appears to be more reduced in females than in males, and cleft palate is the least frequently manifested trait" (PMID: 458832). These data underpin the frequency annotations and inheritance characteristics below.
PIEZO2 shows a clean genotype–mechanism dichotomy. Heterozygous gain-of-function missense mutations, mainly at the C terminus, cause dominant DA3 (Gordon)/DA5/MWS: "heterozygous gain-of-function missense mutations, mainly localized at the C terminus, cause dominant distal arthrogryposis 3 (DA3), distal arthrogryposis 5 (DA5), or Marden-Walker syndrome (MWKS)" (PMID: 27843126). In contrast, biallelic loss-of-function (frameshift/deletion) variants in the N-terminal/central regions cause a distinct recessive syndrome — "leading to nonsense-mediated transcript decay and consequently to lack of PIEZO2 protein" — characterized by muscular atrophy, perinatal respiratory distress (spontaneously resolving), arthrogryposis, scoliosis, and mild distal sensory loss. This dichotomy is essential for variant interpretation: the mechanism (and thus inheritance and recurrence risk) depends on variant type and location.
Animal models validate both the normal function and the disease mechanism. Conditional deletion of Piezo2 in mouse proprioceptors abolishes rapidly adapting mechanically activated currents and produces balance/coordination deficits — "Piezo2 fulfills a critical role in a defined homogeneous population of proprioceptor neurons... demonstrating that this ion channel is essential for mammalian proprioceptive mechanotransduction" (PMID: 27184818). A GoF knock-in mouse reproduces contractures (PMID: 36634173). In C. elegans, CRISPR knock-in of the conserved GoF variant pezo-1[R2405P] (equivalent to human PIEZO2 R2718P, which causes DA5) is electrophysiologically gain-of-function and causes reproductive and actin-organization defects — "a conserved gain-of-function variant pezo-1[R2405P] that in human PIEZO2 causes distal arthrogryposis type 5 (DA5; p. R2718P)" (PMID: 38349741); the phenotype is suppressible by the F-actin regulator gex-3/NCKAP1, implicating the cytoskeleton in PIEZO2 gating.
GS is not a discrete entity but one pole of a continuum. A review of individuals sharing the recurrent p.Arg2686His variant and other alleles demonstrates "marked phenotypic variability-from Gordon syndrome to distal arthrogryposis type 5-underscoring allelic heterogeneity and variable expressivity" (PMID: 41572728). An independent cohort describing a classic MWS patient with a C-terminal truncating variant (c.8237G>A/p.W2746*) alongside a GS girl with the prevalent c.8057G>A/p.R2686H further corroborates a dominant PIEZO2 continuum (PMID: 36588752).
Branch A (GS-defining): The p.Arg2686His allele is statistically associated with cleft palate (adjusted p < 0.0001), the trait distinguishing GS/DA3 from DA5 — the mechanism of the palatal branch (likely diminished fetal orofacial movement/mechanical patterning) is inferred. [association demonstrated — PMID 24726473; mechanism inferred]
Branch B: Other C-terminal alleles shift the phenotype toward DA5 (ptosis, ophthalmoplegia, no cleft palate) or Marden-Walker syndrome (CNS involvement), producing the continuous spectrum. [demonstrated — PMID 27843126, 41572728]
PIEZO2 variant
│
├── C-terminal MISSENSE, heterozygous ─── GAIN of function ─── ↑ mechanotransduction
│ └── DOMINANT: DA3 (Gordon) / DA5 / Marden-Walker (a continuous spectrum)
│
└── N-terminal/central FRAMESHIFT/DELETION, biallelic ─── NMD → NO protein ─── LOSS of function
└── RECESSIVE: muscular atrophy, perinatal respiratory distress,
arthrogryposis, scoliosis, distal sensory loss
Gordon Syndrome is a rare autosomal-dominant distal arthrogryposis characterized by the triad of camptodactyly, clubfoot, and cleft palate, usually with short stature. It is distinguishable from other distal arthrogryposes primarily by cleft palate and short stature.
| Resource | Identifier |
|---|---|
| MONDO | MONDO:0007252 |
| OMIM | #114300 |
| Orphanet | ORPHA:375 (Gordon syndrome / distal arthrogryposis type 3) |
| MeSH | Arthrogryposis (indexed via Distal Arthrogryposis / PIEZO2) |
| ICD-10 | Q74.3 (Arthrogryposis multiplex congenita) — no GS-specific code |
| ICD-11 | LD28.1 / arthrogryposis grouping (no GS-specific code) |
| Gene | PIEZO2 (HGNC:26270), 18p11.22 |
Synonyms / alternative names: Distal arthrogryposis type 3 (DA3); Camptodactyly–cleft palate–clubfoot; Gordon's syndrome. Data source type: Aggregated disease-level resources and published case series/cohorts (OMIM, Orphanet, PubMed) — not individual EHR data.
| Phenotype | HPO term (suggested) | Type | Frequency | Onset / course |
|---|---|---|---|---|
| Camptodactyly | HP:0012385 | Clinical sign / physical | ~89% | Congenital, non-progressive |
| Talipes equinovarus (clubfoot) | HP:0001762 | Physical malformation | ~73% | Congenital, non-progressive |
| Cleft palate | HP:0000175 | Physical malformation | ~27% (GS-defining; assoc. R2686H) | Congenital |
| Short stature | HP:0004322 | Physical | Common | Congenital/childhood |
| Ptosis | HP:0000508 | Clinical sign | Frequent (esp. DA5 end) | Congenital |
| Scoliosis / stiff spine | HP:0002650 | Physical | Reported | Childhood, may progress |
| Distinctive facies | HP:0001999 | Physical | Variable | Congenital |
| Bifid uvula | HP:0000193 | Physical | Reported (mild palatal end) | Congenital |
| Mild intellectual disability / psychomotor delay | HP:0001256 / HP:0001263 | Behavioral/cognitive | Occasional (spectrum) | Childhood |
Frequencies from PMID: 11718203; psychomotor delay/ID occasionally reported (PMID: 27714920). Severity: mild to moderate, variable. Progression: congenital and essentially non-progressive (contractures static, though scoliosis can progress). Quality-of-life impact: contractures affect fine motor function and ambulation; cleft palate affects feeding/speech; most distal-arthrogryposis patients achieve independent ambulation and self-care (PMID: 33104047). No GS-specific EQ-5D/SF-36 data available.
Not applicable. GS is a monogenic germline disorder. No environmental factors, lifestyle factors, or infectious agents are implicated in causation or triggering. (Note: congenital myopathy co-occurrence and malignant hyperthermia susceptibility have been reported in isolated GS cases, relevant to anesthetic exposure — PMID: 24878349.)
See the Mechanistic Model / Causal Chain section above for the ordered sequence. In brief: C-terminal PIEZO2 GoF variant → altered channel inactivation → excess mechanically activated current → hyperactive proprioceptive sensory-neuron mechanotransduction during development → reduced fetal movement and neurogenic joint contractures → congenital GS phenotype, with the R2686H allele branching toward cleft palate and other alleles branching toward DA5/MWS. Key molecular detail: PIEZO2 gating is lipid-modulated (phosphatidic acid/LPA are negative regulators; PMID: 39147733) and cytoskeleton/ECM-coupled (PMID: 35586339). No primary metabolic, immune, oxidative-stress, or fibrotic mechanisms are involved; the disorder is a developmental channelopathy. GO/CL anchors as listed above.
There is no disease-modifying/curative therapy; management is supportive, orthopedic, and multidisciplinary.
| Model | Type | Construct | Phenotype recapitulation | Reference |
|---|---|---|---|---|
| Mouse (Mus musculus) | Mammalian, in vivo | Proprioceptor-specific Piezo2 GoF knock-in | High — sufficient to induce DA5-like contractures; Botox + dietary fatty acid rescue | PMID: 36634173 |
| Mouse | Mammalian, in vivo | Conditional Piezo2 knockout in proprioceptors | Validates normal function — loss abolishes RA mechanically activated currents, balance/coordination deficits | PMID: 27184818 |
| C. elegans | Invertebrate | pezo-1[R2405P] CRISPR knock-in (≈ human R2718P/DA5) | Moderate — GoF electrophysiology + reproductive/actin defects; suppressed by gex-3/NCKAP1 | PMID: 38349741 |
| HEK/heterologous cells | In vitro | PIEZO2 mutant cDNA (E2727del, I802F) | Biophysical GoF (altered inactivation); no toxicity | PMID: 23487782 |
| PMID | Title (abbrev.) | Evidence type | Supports |
|---|---|---|---|
| 24726473 | Mutations in PIEZO2 cause GS, MWS, and DA5 | Human exome cohort | F1 — causal gene, recurrent R2686H, cleft-palate association |
| 23487782 | Gain-of-function PIEZO2 mutations cause a DA subtype | In vitro electrophysiology | F2 — GoF via altered inactivation; no toxicity |
| 36634173 | Excessive mechanotransduction in sensory neurons causes joint contractures | Mouse in vivo | F3 — neurogenic mechanism; Botox/fatty-acid rescue |
| 11718203 | Scoliosis in Gordon's syndrome | Human clinical | F4 — triad frequencies |
| 458832 | Gordon syndrome large pedigree | Human pedigree | F4 — AD inheritance, reduced female penetrance, variable expressivity |
| 27843126 | Biallelic loss of PIEZO2... | Human + mechanism | F5 — dominant GoF vs recessive LOF dichotomy |
| 27184818 | Critical role for Piezo2 in proprioceptive mechanotransduction | Mouse in vivo | F6 — Piezo2 essential for proprioception |
| 38349741 | F-actin factor suppresses DA5 PIEZO2 variant in C. elegans | Invertebrate model | F6 — conserved GoF model; cytoskeletal modifier |
| 41572728 | Expanding genotype-phenotype of MWS due to PIEZO2 | Human review | F7 — same variant → GS↔DA5 continuum |
| 36588752 | Continuum in dominant PIEZO2 spectrum | Human cohort | F7 — dominant PIEZO2 continuum |
| 30988732 | Bioinformatics of PIEZO2 mutations | Computational | F2/F5 — C-terminal dominant GoF vs N-terminal recessive LOF |
| 39147733 | Phosphatidic acid negatively regulates PIEZO2 | In vitro/mouse | Mechanism/therapeutics — lipid modulation |
| 37587573 | Novel PIEZO2 variant in a fetus (GS) | Human case | Prenatal diagnosis; de novo/mosaicism |
| 36317804 | Lethal respiratory course in PIEZO2 DA5 | Human case | Severe end of spectrum / prognosis |
| 24878349 | GS with congenital myopathy / malignant hyperthermia | Human cases | Anesthetic risk; comorbidity |
| 27714920 | Familial GS with PIEZO2 mutation | Human family | Prenatal detection; psychomotor-delay spectrum |
Consistency of the evidence: The causal gene and GoF mechanism are supported convergently by human genetics (exome cohorts), in vitro electrophysiology, and two independent animal models — an unusually complete chain for a rare disorder. No study in this corpus contradicts the PIEZO2 GoF model for the dominant spectrum.
Report compiled from 5 autonomous investigation iterations; 7 confirmed findings; 32 papers reviewed. Evidence types span human clinical/genetic cohorts, in vitro electrophysiology, computational analysis, and mouse/C. elegans models. Information derived from aggregated disease-level resources and primary literature, not individual EHR data.
Checked with linkml-reference-validator 0.3.0.
| Outcome | Count |
|---|---|
| References checked | 19 |
| Resolved | 19 |
| Unresolved (possible confabulation) | 0 |
| Unverifiable | 0 |
| References weighed for topical relevance | 19 |
| On topic | 12 |
| Off topic | 0 |
All extracted references resolved successfully.
Checked with linkml-term-validator 0.4.5, through the ols: adapter.
| Outcome | Count |
|---|---|
| Terms checked | 23 |
| Resolved | 21 |
| Unresolved (possible confabulation) | 0 |
| Obsolete | 0 |
| Unverifiable | 2 |
| Terms whose name was checked | 12 |
| Terms named correctly | 5 |
| Terms named as a different term | 2 |
| Terms whose name is worth a second look | 5 |
These identifiers resolve, so nothing about them looks wrong, and the ontology calls them something unrelated to what the report calls them. That usually means the identifier is not the one the sentence needs:
MONDO:0007252 (2 mentions) - the report calls it "MONDO"; MONDO calls it Gordon syndromeGO:0005886 (2 mentions) - the report calls it "GO cellular component: plasma membrane", "Subcellular level: Plasma membrane mechanosensitive channel"; GO calls it plasma membraneThe report's name for these is recognisably related to the term's own name without being one of them. A loose paraphrase reads the same way as a citation of the wrong sibling term - and so does a related synonym, which the ontology records precisely because it names something adjacent rather than the same thing - so these are listed rather than judged:
GO:0050982 (1 mention) - the report calls it "GO biological process: detection of mechanical stimulus"; GO calls it detection of mechanical stimulus**GO:0140135 (1 mention) - the report calls it "GO molecular function: mechanosensitive monoatomic cation channel activity"; GO calls it mechanosensitive monoatomic cation channel activity**HP:0001762 (1 mention) - the report calls it "Talipes equinovarus (clubfoot)"; HP calls it Talipes equinovarusHP:0002650 (1 mention) - the report calls it "Scoliosis / stiff spine"; HP calls it ScoliosisHP:0001999 (1 mention) - the report calls it "Distinctive facies"; HP calls it Abnormal facial shape, and lists "Distinctive facies" among its other namesThe report gives these identifiers more than one name of its own:
GO:0005886 - called "GO cellular component: plasma membrane", "Subcellular level: Plasma membrane mechanosensitive channel"Terms carrying these prefixes were not checked either way, because no configured ontology covers them. An unrecognised prefix may name an ontology this run could not reach as easily as one that does not exist, so nothing here is evidence of fabrication: ORPHA.