The COL11A2-related skeletal spectrum encompasses Stickler syndrome type III (non-ocular Stickler, autosomal dominant) and otospondylomegaepiphyseal dysplasia (OSMED, autosomal recessive), both caused by mutations in COL11A2 encoding the alpha-2 chain of type XI collagen. These disorders share overlapping skeletal and auditory features but differ in severity. Stickler type III presents with mild spondyloepiphyseal dysplasia, sensorineural hearing loss, midface hypoplasia, and early-onset osteoarthritis, but crucially lacks the ocular involvement seen in Stickler types I and II. OSMED is a more severe autosomal recessive skeletal dysplasia with profound sensorineural hearing loss, disproportionately short limbs, enlarged epiphyses, platyspondyly, severe midface hypoplasia, and cleft palate, again without ocular involvement. The absence of eye disease distinguishes both conditions from COL2A1 and COL11A1-related Stickler syndromes, because COL11A2 is not expressed in the vitreous humor.
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name: COL11A2-Related Skeletal Spectrum
creation_date: '2026-04-04T12:00:00Z'
updated_date: '2026-05-08T18:54:20Z'
category: Mendelian
description: >
The COL11A2-related skeletal spectrum encompasses Stickler syndrome type III
(non-ocular Stickler, autosomal dominant) and otospondylomegaepiphyseal dysplasia
(OSMED, autosomal recessive), both caused by mutations in COL11A2 encoding the
alpha-2 chain of type XI collagen. These disorders share overlapping skeletal and
auditory features but differ in severity. Stickler type III presents with mild
spondyloepiphyseal dysplasia, sensorineural hearing loss, midface hypoplasia, and
early-onset osteoarthritis, but crucially lacks the ocular involvement seen in
Stickler types I and II. OSMED is a more severe autosomal recessive skeletal
dysplasia with profound sensorineural hearing loss, disproportionately short limbs,
enlarged epiphyses, platyspondyly, severe midface hypoplasia, and cleft palate,
again without ocular involvement. The absence of eye disease distinguishes both
conditions from COL2A1 and COL11A1-related Stickler syndromes, because COL11A2
is not expressed in the vitreous humor.
disease_term:
preferred_term: COL11A2-related skeletal spectrum
term:
id: MONDO:0008490
label: otospondylomegaepiphyseal dysplasia, autosomal dominant
parents:
- Type XI collagenopathy
- Stickler syndrome
- Spondyloepiphyseal dysplasia
has_subtypes:
- name: Stickler III
display_name: Stickler Syndrome Type III (Autosomal Dominant)
description: >
Non-ocular Stickler syndrome caused by heterozygous COL11A2 mutations, typically
splice-site mutations producing in-frame exon skipping with a dominant-negative
effect. Features include mild spondyloepiphyseal dysplasia, sensorineural hearing
loss, midface hypoplasia, and early-onset osteoarthritis. No ocular involvement.
- name: OSMED
display_name: OSMED (Autosomal Recessive)
description: >
Otospondylomegaepiphyseal dysplasia caused by biallelic COL11A2 loss-of-function
mutations. A more severe phenotype with profound sensorineural hearing loss,
disproportionate short limbs, enlarged epiphyses, platyspondyly, cleft palate,
and severe midface hypoplasia. Also known as Weissenbacher-Zweymuller syndrome
in neonatal presentation.
inheritance:
- name: Autosomal Dominant (Stickler III)
inheritance_term:
preferred_term: Autosomal dominant inheritance
term:
id: HP:0000006
label: Autosomal dominant inheritance
description: >
Stickler syndrome type III follows autosomal dominant inheritance. Heterozygous
mutations, typically splice-site mutations causing in-frame exon skipping, produce
a dominant-negative effect on type XI collagen assembly, resulting in the milder
skeletal phenotype with hearing loss.
evidence:
- reference: PMID:7859284
reference_title: "Autosomal dominant and recessive osteochondrodysplasias associated with the COL11A2 locus."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "an autosomal dominant form of Stickler syndrome, characterized by mild spondyloepiphyseal dysplasia, osteoarthritis, and sensorineural hearing loss, but no eye involvement, is caused by a splice donor site mutation resulting in \"in-frame\" exon skipping within the COL11A2 gene"
explanation: Landmark Cell paper establishing that dominant COL11A2 splice-site mutations cause non-ocular Stickler syndrome with skeletal and auditory features.
- name: Autosomal Recessive (OSMED)
inheritance_term:
preferred_term: Autosomal recessive inheritance
term:
id: HP:0000007
label: Autosomal recessive inheritance
description: >
OSMED follows autosomal recessive inheritance. Biallelic COL11A2 mutations
(homozygous or compound heterozygous), most predicted to cause premature
termination of translation and complete loss of alpha-2(XI) chains, result in
the severe skeletal and auditory phenotype.
evidence:
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "We conclude that the OSMED phenotype is highly homogenous and results from homozygosity or compound heterozygosity for COL11A2 mutations, most of which are predicted to cause complete absence of alpha2(XI) chains."
explanation: Definitive study of seven OSMED families establishing autosomal recessive inheritance with loss-of-function COL11A2 mutations.
pathophysiology:
- name: COL11A2 Dominant-Negative Disruption of Type XI Collagen
description: >
In Stickler syndrome type III, heterozygous splice-site mutations in COL11A2
cause in-frame exon skipping, producing shortened but partially functional
alpha-2(XI) chains. These abnormal chains are incorporated into type XI collagen
heterotrimers, exerting a dominant-negative effect that disrupts normal collagen
fibril organization in cartilage, bone, and the inner ear. The structural
compromise is sufficient to cause spondyloepiphyseal changes, progressive
osteoarthritis, and sensorineural hearing loss, but is milder than complete loss
of function. COL11A2 is not expressed in the vitreous, explaining the absence
of ocular findings.
gene:
preferred_term: COL11A2
description: >
Collagen type XI alpha-2 chain. Dominant-negative mutations produce structurally
abnormal chains that disrupt collagen XI assembly in cartilage and inner ear.
modifier: DECREASED
term:
id: hgnc:2187
label: COL11A2
cell_types:
- preferred_term: Chondrocyte
term:
id: CL:0000138
label: chondrocyte
biological_processes:
- preferred_term: Collagen fibril organization
term:
id: GO:0030199
label: collagen fibril organization
- preferred_term: Cartilage development
term:
id: GO:0051216
label: cartilage development
- preferred_term: Bone development
term:
id: GO:0060348
label: bone development
evidence:
- reference: PMID:7859284
reference_title: "Autosomal dominant and recessive osteochondrodysplasias associated with the COL11A2 locus."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "an autosomal dominant form of Stickler syndrome, characterized by mild spondyloepiphyseal dysplasia, osteoarthritis, and sensorineural hearing loss, but no eye involvement, is caused by a splice donor site mutation resulting in \"in-frame\" exon skipping within the COL11A2 gene"
explanation: Identifies the dominant-negative splice-site mutation mechanism and its phenotypic consequences in the original Stickler III family.
- reference: PMID:7859284
reference_title: "Autosomal dominant and recessive osteochondrodysplasias associated with the COL11A2 locus."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The results suggest that mutations in collagen XI genes are associated with a spectrum of abnormalities in human skeletal development and support the conclusion of others, based on studies of murine chondrodysplasia, that collagen XI is essential for skeletal morphogenesis."
explanation: Establishes collagen XI as essential for skeletal morphogenesis.
downstream:
- target: Spondyloepiphyseal Dysplasia and Early-Onset Osteoarthritis
- target: Sensorineural Hearing Loss in COL11A2 Skeletal Spectrum
- name: COL11A2 Complete Loss of Function in OSMED
description: >
In OSMED, biallelic loss-of-function mutations in COL11A2 cause complete absence
of alpha-2(XI) collagen chains. Without functional alpha-2(XI) chains, type XI
collagen heterotrimers cannot assemble properly in cartilage, bone, and the inner
ear. The resulting severe collagen deficiency produces widespread skeletal
dysplasia with disproportionate limb shortening, enlarged epiphyses,
platyspondyly, severe craniofacial anomalies, and profound hearing loss. The
remarkably homogeneous OSMED phenotype across families reflects the consistent
effect of complete alpha-2(XI) loss.
gene:
preferred_term: COL11A2
description: >
Collagen type XI alpha-2 chain. Biallelic null mutations cause complete absence
of alpha-2(XI) chains and severe skeletal dysplasia.
modifier: DECREASED
term:
id: hgnc:2187
label: COL11A2
cell_types:
- preferred_term: Chondrocyte
term:
id: CL:0000138
label: chondrocyte
- preferred_term: Osteoblast
term:
id: CL:0000062
label: osteoblast
biological_processes:
- preferred_term: Collagen fibril organization
term:
id: GO:0030199
label: collagen fibril organization
- preferred_term: Cartilage development
term:
id: GO:0051216
label: cartilage development
- preferred_term: Bone development
term:
id: GO:0060348
label: bone development
evidence:
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Of the 10 identified mutations, 9 are predicted to cause premature termination of translation, and 1 is predicted to cause an in-frame deletion."
explanation: Demonstrates that the overwhelming majority of OSMED mutations are null alleles, consistent with complete loss of alpha-2(XI) function.
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "All affected individuals had a remarkably similar phenotype: profound sensorineural hearing loss, skeletal dysplasia with limb shortening and large epiphyses, cleft palate, an extremely flat face, hypoplasia of the mandible, a short nose with anteverted nares, and a flat nasal bridge."
explanation: Comprehensive phenotypic description of OSMED across seven families, establishing the homogeneous severe phenotype.
downstream:
- target: Spondyloepiphyseal Dysplasia and Early-Onset Osteoarthritis
- target: Sensorineural Hearing Loss in COL11A2 Skeletal Spectrum
- target: Craniofacial Anomalies
- name: Spondyloepiphyseal Dysplasia and Early-Onset Osteoarthritis
description: >
Defective type XI collagen compromises cartilage extracellular matrix integrity,
leading to abnormal epiphyseal development, vertebral body flattening, and
accelerated cartilage degeneration. In Stickler III, this manifests as mild
spondyloepiphyseal dysplasia progressing to early-onset polyarticular
osteoarthritis, often requiring joint replacement before age 50. In OSMED, the
skeletal dysplasia is more severe with enlarged epiphyses, disproportionate limb
shortening, and platyspondyly evident from birth.
evidence:
- reference: PMID:18381781
reference_title: "Early-onset osteoarthritis due to otospondylomegaepiphyseal dysplasia in a family with a novel splicing mutation of the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The 3 affected individuals had normal stature, mild mid-face hypoplasia, and hearing impairment, but normal eyes."
explanation: Clinical description of a Stickler III family presenting primarily with early-onset osteoarthritis and mild skeletal features.
- reference: PMID:18381781
reference_title: "Early-onset osteoarthritis due to otospondylomegaepiphyseal dysplasia in a family with a novel splicing mutation of the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "the child's radiographs showed enlarged epiphyses with an advanced bone age."
explanation: Demonstrates the characteristic enlarged epiphyses in the pediatric presentation of COL11A2-related skeletal dysplasia.
- name: Sensorineural Hearing Loss in COL11A2 Skeletal Spectrum
description: >
Sensorineural hearing loss is a cardinal feature shared by both Stickler III and
OSMED. Type XI collagen is essential for the structural integrity of the tectorial
membrane in the cochlea. In Stickler III, hearing loss is variable, often
moderate. In OSMED, hearing loss is consistently profound and prelingual,
reflecting the complete loss of alpha-2(XI) function.
evidence:
- reference: PMID:23110709
reference_title: "Hearing impairment in Stickler syndrome: a systematic review."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Overall, mutations in COL11A1 (82.5%) and COL11A2 (94.1%) seem to be more frequently associated with hearing impairment than mutations in COL2A1 (52.2%)."
explanation: Systematic review showing that COL11A2 mutations have the highest association with hearing impairment among all Stickler-related genes.
- reference: PMID:23110709
reference_title: "Hearing impairment in Stickler syndrome: a systematic review."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Hearing loss was found in 62.9%, mostly mild to moderate when reported. Hearing impairment was predominantly sensorineural (67.8%)."
explanation: Confirms sensorineural hearing loss as the predominant type in Stickler syndrome.
- name: Craniofacial Anomalies
description: >
Defective type XI collagen disrupts craniofacial cartilage and bone development,
leading to midface hypoplasia, depressed nasal bridge, micrognathia, and in
OSMED specifically, cleft palate. These features are more severe in OSMED than
in Stickler III, reflecting the degree of collagen XI deficiency. Some OSMED
neonates present with Pierre Robin sequence.
evidence:
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "an extremely flat face, hypoplasia of the mandible, a short nose with anteverted nares, and a flat nasal bridge."
explanation: Describes the characteristic severe craniofacial phenotype of OSMED.
genetic:
- name: COL11A2 Mutations
association: Causative
features: >
Stickler III is caused by heterozygous splice-site or missense mutations producing
dominant-negative effects. OSMED is caused by biallelic loss-of-function mutations
(nonsense, frameshift, splice-site) leading to complete absence of alpha-2(XI)
chains. Compound heterozygosity in nonconsanguineous families and homozygosity
in
consanguineous families have both been documented.
gene_term:
preferred_term: COL11A2
term:
id: hgnc:2187
label: COL11A2
evidence:
- reference: PMID:7859284
reference_title: "Autosomal dominant and recessive osteochondrodysplasias associated with the COL11A2 locus."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "an autosomal dominant form of Stickler syndrome, characterized by mild spondyloepiphyseal dysplasia, osteoarthritis, and sensorineural hearing loss, but no eye involvement, is caused by a splice donor site mutation resulting in \"in-frame\" exon skipping within the COL11A2 gene, encoding the alpha 2(XI) chain of the quantitatively minor fibrillar collagen XI."
explanation: Original identification of COL11A2 as the gene responsible for non-ocular Stickler syndrome, with a dominant splice-site mutation.
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Individuals from four families, including three with consanguineous parents, were homozygous for mutations. Individuals from three other families, in whom parents were nonconsanguineous, were compound heterozygous."
explanation: Demonstrates both homozygous and compound heterozygous mutation patterns in OSMED across seven families.
phenotypes:
- name: Sensorineural Hearing Impairment
description: >
Sensorineural hearing loss is present in virtually all affected individuals.
In Stickler III, hearing loss is variable but often moderate. In OSMED,
hearing loss is consistently profound and prelingual.
phenotype_term:
preferred_term: Sensorineural hearing impairment
term:
id: HP:0000407
label: Sensorineural hearing impairment
evidence:
- reference: PMID:23110709
reference_title: "Hearing impairment in Stickler syndrome: a systematic review."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Overall, mutations in COL11A1 (82.5%) and COL11A2 (94.1%) seem to be more frequently associated with hearing impairment than mutations in COL2A1 (52.2%)."
explanation: Systematic review demonstrating 94.1% prevalence of hearing impairment with COL11A2 mutations.
- name: Midface Retrusion
description: >
Midface hypoplasia with depressed nasal bridge is a consistent feature,
more severe in OSMED than in Stickler III.
phenotype_term:
preferred_term: Midface retrusion
term:
id: HP:0011800
label: Midface retrusion
evidence:
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "an extremely flat face, hypoplasia of the mandible, a short nose with anteverted nares, and a flat nasal bridge."
explanation: Detailed craniofacial description of OSMED phenotype.
- name: Premature Osteoarthritis
description: >
Early-onset degenerative joint disease is a major feature, particularly in
Stickler III where it may be the presenting complaint. Joint replacement
surgery is often required.
phenotype_term:
preferred_term: Premature osteoarthritis
term:
id: HP:0003088
label: Premature osteoarthritis
evidence:
- reference: PMID:18381781
reference_title: "Early-onset osteoarthritis due to otospondylomegaepiphyseal dysplasia in a family with a novel splicing mutation of the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Radiographs of the affected adults showed severe polyarticular OA but did not reveal diagnostic evidence of an underlying skeletal dysplasia."
explanation: Demonstrates that early-onset osteoarthritis can be the dominant presentation of Stickler III, even masking the underlying dysplasia in adults.
- name: Platyspondyly
subtype: OSMED
description: >
Flattened vertebral bodies are a hallmark of OSMED and contribute to the
disproportionate short-trunk stature.
phenotype_term:
preferred_term: Platyspondyly
term:
id: HP:0000926
label: Platyspondyly
evidence:
- reference: PMID:37347055
reference_title: "Case report: Autosomal recessive type 3 Stickler syndrome caused by compound heterozygous mutations in COL11A2."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "He presented a phenotype highly suggestive of OSMED, including progressive sensorineural deafness, spondyloepiphyseal dysplasia with large epiphyses, platyspondyly, degenerative osteoarthritis, and sunken nasal bridge."
explanation: Clinical description of OSMED patient with platyspondyly as a cardinal feature.
- name: Enlarged Epiphyses
subtype: OSMED
description: >
Megaepiphyses are the hallmark radiographic finding that gives OSMED its name.
They are visible in childhood and may normalize somewhat in adults.
phenotype_term:
preferred_term: Enlarged epiphyses
term:
id: HP:0010580
label: Enlarged epiphyses
evidence:
- reference: PMID:18381781
reference_title: "Early-onset osteoarthritis due to otospondylomegaepiphyseal dysplasia in a family with a novel splicing mutation of the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "the child's radiographs showed enlarged epiphyses with an advanced bone age."
explanation: Radiographic confirmation of enlarged epiphyses in a pediatric case.
- name: Cleft Palate
subtype: OSMED
description: >
Cleft palate is common in OSMED, sometimes presenting as part of Pierre Robin
sequence with micrognathia and glossoptosis.
phenotype_term:
preferred_term: Cleft palate
term:
id: HP:0000175
label: Cleft palate
evidence:
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "profound sensorineural hearing loss, skeletal dysplasia with limb shortening and large epiphyses, cleft palate, an extremely flat face"
explanation: Cleft palate listed among cardinal OSMED features across seven families.
- name: Depressed Nasal Bridge
description: >
Depressed nasal bridge is a consistent craniofacial feature in both Stickler III
and OSMED, more pronounced in the recessive form.
phenotype_term:
preferred_term: Depressed nasal bridge
term:
id: HP:0005280
label: Depressed nasal bridge
evidence:
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "a flat nasal bridge."
explanation: Flat nasal bridge documented in all OSMED families.
- name: Micrognathia
subtype: OSMED
description: >
Hypoplasia of the mandible is characteristic of OSMED and can contribute
to neonatal airway difficulties.
phenotype_term:
preferred_term: Micrognathia
term:
id: HP:0000347
label: Micrognathia
evidence:
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "hypoplasia of the mandible"
explanation: Mandibular hypoplasia documented across all OSMED families.
- name: Short Nose with Anteverted Nares
subtype: OSMED
description: >
Short nose with upturned nostrils is a characteristic facial feature of OSMED.
phenotype_term:
preferred_term: Anteverted nares
term:
id: HP:0000463
label: Anteverted nares
evidence:
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "a short nose with anteverted nares"
explanation: Short nose with anteverted nares documented across OSMED families.
- name: Arthralgia
description: >
Joint pain is common across the spectrum and often the presenting complaint
in Stickler III adults.
phenotype_term:
preferred_term: Arthralgia
term:
id: HP:0002829
label: Arthralgia
evidence:
- reference: PMID:37347055
reference_title: "Case report: Autosomal recessive type 3 Stickler syndrome caused by compound heterozygous mutations in COL11A2."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A 29-year-old Chinese male was referred to our hospital for hearing loss and multiple joint pain."
explanation: Joint pain as a presenting complaint in an OSMED patient.
diagnosis:
- name: COL11A2 molecular and phenotype-based diagnosis
description: >-
Diagnosis distinguishes dominant non-ocular Stickler syndrome from
recessive OSMED by integrating skeletal, hearing, craniofacial, and ocular
absence features with COL11A2 molecular testing.
diagnosis_term:
preferred_term: genetic testing
term:
id: MAXO:0000127
label: genetic testing
results: Heterozygous or biallelic COL11A2 variant plus matching non-ocular skeletal-auditory phenotype.
evidence:
- reference: PMID:7859284
reference_title: "Autosomal dominant and recessive osteochondrodysplasias associated with the COL11A2 locus."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
an autosomal dominant form of Stickler syndrome, characterized by
mild spondyloepiphyseal dysplasia, osteoarthritis, and sensorineural
hearing loss, but no eye involvement, is caused by a splice donor
site mutation resulting in "in-frame" exon skipping within the
COL11A2 gene
explanation: This supports dominant COL11A2 testing in the non-ocular Stickler III presentation.
- reference: PMID:10677296
reference_title: "Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the COL11A2 gene."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "We conclude that the OSMED phenotype is highly homogenous and results from homozygosity or compound heterozygosity for COL11A2 mutations, most of which are predicted to cause complete absence of alpha2(XI) chains."
explanation: This supports recessive COL11A2 testing for the OSMED presentation.
treatments:
- name: Joint Replacement Surgery
description: >
Total joint arthroplasty may be required for severe early-onset osteoarthritis,
particularly affecting hips and knees.
treatment_term:
preferred_term: surgical procedure
term:
id: MAXO:0000004
label: surgical procedure
- name: Hearing Aids
description: >
Hearing aids for moderate hearing loss in Stickler III. For profound hearing
loss in OSMED, cochlear implantation may be necessary.
treatment_term:
preferred_term: hearing aid usage
term:
id: MAXO:0009030
label: hearing aid usage
- name: Cochlear Implantation
description: >
Cochlear implantation for profound sensorineural hearing loss in OSMED patients.
treatment_term:
preferred_term: cochlear device implantation
term:
id: MAXO:0009025
label: cochlear device implantation
- name: Genetic Counseling
description: >
Genetic counseling for families to determine inheritance pattern (autosomal
dominant Stickler III vs. autosomal recessive OSMED) and recurrence risk.
treatment_term:
preferred_term: genetic counseling
term:
id: MAXO:0000079
label: genetic counseling
notes: >
The COL11A2-related skeletal spectrum is distinguished from other Stickler
syndromes by the consistent absence of ocular involvement. COL11A2 is not
expressed in the vitreous humor, so mutations do not cause the vitreous
anomalies, myopia, or retinal detachment risk seen in COL2A1 (type 1) or
COL11A1 (type 2) Stickler syndrome. Weissenbacher-Zweymuller syndrome, once
considered a separate entity, is now recognized as the neonatal presentation
of OSMED. The existing Stickler Syndrome Type 1 entry in this knowledge base
covers the more common COL2A1-related form.
references:
- reference: DOI:10.1002/dvdy.1178
title: 'Targeted disruption of Col11a2 produces a mild cartilage phenotype in transgenic mice: Comparison with the human disorder otospondylomegaepiphyseal dysplasia (OSMED)'
found_in:
- COL11A2_Skeletal_Spectrum-deep-research-falcon.md
findings:
- statement: Transgenic mice were prepared by homologous recombination with a Col11a2 targeting gene in which an inverted neomycin‐resistant gene was inserted between restriction sites in exons 27 and 28.
supporting_text: Transgenic mice were prepared by homologous recombination with a Col11a2 targeting gene in which an inverted neomycin‐resistant gene was inserted between restriction sites in exons 27 and 28.
evidence:
- reference: DOI:10.1002/dvdy.1178
reference_title: 'Targeted disruption of Col11a2 produces a mild cartilage phenotype in transgenic mice: Comparison with the human disorder otospondylomegaepiphyseal dysplasia (OSMED)'
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: Transgenic mice were prepared by homologous recombination with a Col11a2 targeting gene in which an inverted neomycin‐resistant gene was inserted between restriction sites in exons 27 and 28.
explanation: Deep research cited this publication as relevant literature for COL11A2 Skeletal Spectrum.
- reference: DOI:10.1055/s-0039-1698446
title: 'Novel COL11A2 Pathogenic Variants in a Child with Autosomal Recessive Otospondylomegaepiphyseal Dysplasia: A Review of the Literature'
found_in:
- COL11A2_Skeletal_Spectrum-deep-research-falcon.md
findings:
- statement: 'Novel COL11A2 Pathogenic Variants in a Child with Autosomal Recessive Otospondylomegaepiphyseal Dysplasia: A Review of the Literature'
supporting_text: Otospondylomegaepiphyseal dysplasia (OSMED) is an inherited autosomal dominant and recessive skeletal dysplasia caused by both heterozygous and homozygous pathogenic variants in COL11A2 encoding the α2(XI) collagen chains, a part of type XI collagen.
evidence:
- reference: DOI:10.1055/s-0039-1698446
reference_title: 'Novel COL11A2 Pathogenic Variants in a Child with Autosomal Recessive Otospondylomegaepiphyseal Dysplasia: A Review of the Literature'
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: Otospondylomegaepiphyseal dysplasia (OSMED) is an inherited autosomal dominant and recessive skeletal dysplasia caused by both heterozygous and homozygous pathogenic variants in COL11A2 encoding the α2(XI) collagen chains, a part of type XI collagen.
explanation: Deep research cited this publication as relevant literature for COL11A2 Skeletal Spectrum.
- reference: DOI:10.1093/hmg/ddad117
title: COL11A2 as a candidate gene for vertebral malformations and congenital scoliosis
found_in:
- COL11A2_Skeletal_Spectrum-deep-research-falcon.md
findings:
- statement: COL11A2 as a candidate gene for vertebral malformations and congenital scoliosis
supporting_text: Human vertebral malformations (VMs) have an estimated incidence of 1/2000 and are associated with significant health problems including congenital scoliosis (CS) and recurrent organ system malformation syndromes such as VACTERL (vertebral anomalies; anal abnormalities; cardiac abnormalities; tracheo-esophageal fistula; renal anomalies; limb anomalies).
evidence:
- reference: DOI:10.1093/hmg/ddad117
reference_title: COL11A2 as a candidate gene for vertebral malformations and congenital scoliosis
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: Human vertebral malformations (VMs) have an estimated incidence of 1/2000 and are associated with significant health problems including congenital scoliosis (CS) and recurrent organ system malformation syndromes such as VACTERL (vertebral anomalies; anal abnormalities; cardiac abnormalities; tracheo-esophageal fistula; renal anomalies; limb anomalies).
explanation: Deep research cited this publication as relevant literature for COL11A2 Skeletal Spectrum.
- reference: DOI:10.1186/s12920-021-00993-0
title: Diagnostic yield of rare skeletal dysplasia conditions in the radiogenomics era
found_in:
- COL11A2_Skeletal_Spectrum-deep-research-falcon.md
findings:
- statement: Skeletal dysplasia (SD) conditions are rare genetic diseases of the skeleton, encompassing a heterogeneous group of over 400 disorders, and represent approximately 5% of all congenital anomalies.
supporting_text: Skeletal dysplasia (SD) conditions are rare genetic diseases of the skeleton, encompassing a heterogeneous group of over 400 disorders, and represent approximately 5% of all congenital anomalies.
evidence:
- reference: DOI:10.1186/s12920-021-00993-0
reference_title: Diagnostic yield of rare skeletal dysplasia conditions in the radiogenomics era
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: Skeletal dysplasia (SD) conditions are rare genetic diseases of the skeleton, encompassing a heterogeneous group of over 400 disorders, and represent approximately 5% of all congenital anomalies.
explanation: Deep research cited this publication as relevant literature for COL11A2 Skeletal Spectrum.
- reference: DOI:10.17863/cam.86865
title: Dominant Stickler Syndrome.
found_in:
- COL11A2_Skeletal_Spectrum-deep-research-falcon.md
findings:
- statement: The Stickler syndromes are a group of genetic connective tissue disorders associated with an increased risk of rhegmatogenous retinal detachment, deafness, cleft palate, and premature arthritis.
supporting_text: The Stickler syndromes are a group of genetic connective tissue disorders associated with an increased risk of rhegmatogenous retinal detachment, deafness, cleft palate, and premature arthritis.
evidence:
- reference: DOI:10.17863/cam.86865
reference_title: Dominant Stickler Syndrome.
supports: SUPPORT
evidence_source: OTHER
snippet: The Stickler syndromes are a group of genetic connective tissue disorders associated with an increased risk of rhegmatogenous retinal detachment, deafness, cleft palate, and premature arthritis.
explanation: Deep research cited this publication as relevant literature for COL11A2 Skeletal Spectrum.
- reference: DOI:10.3390/genes11121513
title: Exon-Trapping Assay Improves Clinical Interpretation of COL11A1 and COL11A2 Intronic Variants in Stickler Syndrome Type 2 and Otospondylomegaepiphyseal Dysplasia
found_in:
- COL11A2_Skeletal_Spectrum-deep-research-falcon.md
findings:
- statement: Stickler syndrome (SS) is a hereditary connective tissue disorder affecting bones, eyes, and hearing.
supporting_text: Stickler syndrome (SS) is a hereditary connective tissue disorder affecting bones, eyes, and hearing.
evidence:
- reference: DOI:10.3390/genes11121513
reference_title: Exon-Trapping Assay Improves Clinical Interpretation of COL11A1 and COL11A2 Intronic Variants in Stickler Syndrome Type 2 and Otospondylomegaepiphyseal Dysplasia
supports: SUPPORT
evidence_source: IN_VITRO
snippet: Stickler syndrome (SS) is a hereditary connective tissue disorder affecting bones, eyes, and hearing.
explanation: Deep research cited this publication as relevant literature for COL11A2 Skeletal Spectrum.
- reference: DOI:10.3390/genes13091571
title: 'Hearing Loss in Stickler Syndrome: An Update'
found_in:
- COL11A2_Skeletal_Spectrum-deep-research-falcon.md
findings:
- statement: Stickler syndrome is a connective tissue disorder characterized by ocular, skeletal, orofacial and auditory manifestations.
supporting_text: Stickler syndrome is a connective tissue disorder characterized by ocular, skeletal, orofacial and auditory manifestations.
evidence:
- reference: DOI:10.3390/genes13091571
reference_title: 'Hearing Loss in Stickler Syndrome: An Update'
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: Stickler syndrome is a connective tissue disorder characterized by ocular, skeletal, orofacial and auditory manifestations.
explanation: Deep research cited this publication as relevant literature for COL11A2 Skeletal Spectrum.
- reference: DOI:10.3390/ijms27052227
title: 'Prenatal Molecular Diagnosis of COL2A1-Associated Stickler Syndrome: Genotype–Phenotype Correlation in a Resource-Limited Healthcare Setting'
found_in:
- COL11A2_Skeletal_Spectrum-deep-research-falcon.md
findings:
- statement: Stickler syndrome is a monogenic connective tissue disorder primarily caused by pathogenic variants in collagen-related genes, most commonly COL2A1.
supporting_text: Stickler syndrome is a monogenic connective tissue disorder primarily caused by pathogenic variants in collagen-related genes, most commonly COL2A1.
evidence:
- reference: DOI:10.3390/ijms27052227
reference_title: 'Prenatal Molecular Diagnosis of COL2A1-Associated Stickler Syndrome: Genotype–Phenotype Correlation in a Resource-Limited Healthcare Setting'
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: Stickler syndrome is a monogenic connective tissue disorder primarily caused by pathogenic variants in collagen-related genes, most commonly COL2A1.
explanation: Deep research cited this publication as relevant literature for COL11A2 Skeletal Spectrum.
COL11A2-related skeletal spectrum comprises heritable type XI collagenopathies caused by pathogenic variants in COL11A2 (collagen type XI alpha 2 chain), typically presenting with combinations of skeletal dysplasia/arthropathy, craniofacial anomalies (often cleft palate/micrognathia), and sensorineural hearing loss, with minimal/absent ocular involvement as a key differentiator from other Stickler syndromes because COL11A2 is not expressed in the vitreous. (soh2022dominantsticklersyndrome. pages 8-10, sheppard2021sticklersyndrome pages 3-4, melkoniemi2000autosomalrecessivedisorder pages 1-2)
Note: Orphanet / ICD / MeSH identifiers were not directly retrievable from the currently available full-text evidence in this run; the above identifiers come from primary/review literature and Open Targets mapping. (OpenTargets Search: Stickler syndrome,otospondylomegaepiphyseal dysplasia-COL11A2, soh2022dominantsticklersyndrome. pages 1-2, melkoniemi2000autosomalrecessivedisorder pages 1-2)
The information summarized here is derived from aggregated disease-level resources (reviews, case series) and individual patient reports/case series with genetic confirmation; it is not derived from EHR-only sources in the retrieved evidence. (soh2022dominantsticklersyndrome. pages 8-10, melkoniemi2000autosomalrecessivedisorder pages 4-6, su2023casereportautosomal pages 1-2)
Primary cause: germline pathogenic variants in COL11A2. - Autosomal recessive OSMED is strongly associated with loss-of-function (LoF) mechanisms: in a foundational AJHG cohort, 10 distinct COL11A2 mutations were identified across 7 families; nine created premature termination codons and one altered a splicing consensus sequence, with homozygous or compound heterozygous inheritance. (melkoniemi2000autosomalrecessivedisorder pages 6-9) - Autosomal dominant non-ocular Stickler/OSMED is commonly conceptualized as a dominant-negative collagen mechanism (e.g., missense or in-frame exon-skipping/in-frame deletions in the triple helical region), leading to dysfunctional heterotrimers. (soh2022dominantsticklersyndrome. pages 8-10)
Abstract support (example): In a diagnostic-methods paper on COL11A2 splicing, the abstract states: “Type 2 SS and the SS variant otospondylomegaepiphyseal dysplasia (OSMED) are caused by deleterious variants in COL11A1 and COL11A2, respectively.” (Genes, 2020-12; https://doi.org/10.3390/genes11121513) (micale2020exontrappingassayimproves pages 1-3)
No validated protective factors or gene–environment interactions specific to COL11A2-related skeletal spectrum were identified in the retrieved sources. (melkoniemi2000autosomalrecessivedisorder pages 1-2, soh2022dominantsticklersyndrome. pages 8-10)
A. Skeletal / growth / joint disease - Autosomal recessive OSMED is described as a skeletal dysplasia with disproportionately short limbs, enlarged epiphyses, vertebral anomalies, and early joint disease. (melkoniemi2000autosomalrecessivedisorder pages 1-2, melkoniemi2000autosomalrecessivedisorder pages 6-9) - Quantitative phenotype frequencies in one foundational cohort: 10/10 with disproportionate short limbs, enlarged joints, vertebral body anomalies, and cleft palate/bifid uvula; additional findings include small chin in 7/10. (melkoniemi2000autosomalrecessivedisorder pages 4-6) - Dominant non-ocular Stickler/OSMED includes arthropathy and predisposition to premature osteoarthritis, mechanistically linked to abnormal cartilage collagen organization. (soh2022dominantsticklersyndrome. pages 8-10, soh2022dominantsticklersyndrome. pages 1-2)
B. Craniofacial / orofacial - Features repeatedly described include midface hypoplasia, depressed nasal bridge, micrognathia/small chin, and cleft palate/bifid uvula (particularly prominent in recessive OSMED). (melkoniemi2000autosomalrecessivedisorder pages 4-6, selvam2020novelcol11a2pathogenic pages 1-2, melkoniemi2000autosomalrecessivedisorder pages 6-9)
C. Hearing - Hearing loss is a hallmark. In a dominant non-ocular Stickler/OSMED review excerpt, hearing loss is reported as childhood-onset and present in 94.1% of patients. (soh2022dominantsticklersyndrome. pages 8-10) - In a recessive OSMED cohort, sensorineural hearing loss (SNHL) occurred in 10/10. (melkoniemi2000autosomalrecessivedisorder pages 4-6) - A focused Stickler hearing review (Genes, 2022-09; https://doi.org/10.3390/genes13091571) summarizes that for COL11A2 (type 3) hearing loss is typically moderate with audiograms often showing mild–moderate loss at low/mid frequencies and moderate–severe loss at high frequencies; U-shaped audiograms are reported in some patients. (acke2022hearinglossin pages 2-4)
D. Ocular - Minimal/absent ocular involvement is a key discriminator for COL11A2-related disease, consistent with COL11A2 not being expressed in vitreous. (sheppard2021sticklersyndrome pages 3-4, soh2022dominantsticklersyndrome. pages 8-10) - Recessive OSMED cohorts largely lack major ocular findings; the Selvam review table notes 0/10 with ocular findings in the summarized cohort, with only minor refractive/strabismus findings sporadically reported. (selvam2020novelcol11a2pathogenic pages 3-4, selvam2020novelcol11a2pathogenic media b73d0cc6)
(terms suggested based on described clinical features in evidence) - Sensorineural hearing impairment (HP:0000407) (melkoniemi2000autosomalrecessivedisorder pages 4-6, acke2022hearinglossin pages 2-4) - Cleft palate (HP:0000175) / bifid uvula (HP:0000193) (melkoniemi2000autosomalrecessivedisorder pages 4-6) - Midface hypoplasia (HP:0000309) (melkoniemi2000autosomalrecessivedisorder pages 4-6, melkoniemi2000autosomalrecessivedisorder pages 6-9) - Depressed nasal bridge (HP:0005280) (selvam2020novelcol11a2pathogenic pages 1-2) - Micrognathia (HP:0000347) / small chin (HP:0000308) (melkoniemi2000autosomalrecessivedisorder pages 4-6) - Disproportionate short stature (HP:0003498) / short limbs (HP:0009826) (melkoniemi2000autosomalrecessivedisorder pages 4-6) - Platyspondyly (HP:0000926) / vertebral segmentation anomalies (HP:0003312) (melkoniemi2000autosomalrecessivedisorder pages 6-9, su2023casereportautosomal pages 1-2) - Enlarged epiphyses / epiphyseal dysplasia (HP:0002654) (melkoniemi2000autosomalrecessivedisorder pages 6-9, su2023casereportautosomal pages 1-2) - Early-onset osteoarthritis (HP:0002758) / arthropathy (HP:0001367) (soh2022dominantsticklersyndrome. pages 8-10, su2023casereportautosomal pages 1-2)
Direct validated QoL instrument results (EQ-5D/SF-36/PROMIS) were not found in the retrieved evidence; however, the combination of SNHL, cleft palate-related feeding/speech issues, and early arthropathy implies substantial functional impact and need for multidisciplinary support. (sheppard2021sticklersyndrome pages 7-8, soh2022dominantsticklersyndrome. pages 8-10)
Autosomal recessive OSMED (LoF-enriched): - In the AJHG cohort, 10 distinct mutations were identified; most predicted premature truncation, and RNA studies showed splicing defects (e.g., exon skipping or cryptic splice use causing frameshift and premature stop), leading authors to predict absence or truncation of the α2(XI) chain. (melkoniemi2000autosomalrecessivedisorder pages 6-9, melkoniemi2000autosomalrecessivedisorder pages 2-4)
Splice-region variants and in-frame deletions: - Exon-trapping (minigene) assays can demonstrate splicing outcomes for COL11A2 intronic variants; for example, c.4392+1G>A was shown to cause skipping of 54 bp of exon 60. (Genes, 2020-12; https://doi.org/10.3390/genes11121513) (micale2020exontrappingassayimproves pages 11-13)
Dominant-negative concept for COL11A2 Stickler type 3: - A dominant Stickler review excerpt explains that COL11A2 variants often act via dominant negative effects (missense or in-frame exon skipping/in-frame deletions) affecting the helical domain and disrupting heterotrimer formation. (soh2022dominantsticklersyndrome. pages 8-10)
No validated modifier genes or disease-specific epigenetic signatures were identified in the retrieved evidence for COL11A2-related skeletal spectrum.
No disease-specific environmental, lifestyle, or infectious contributors were identified in the retrieved sources; COL11A2-related skeletal spectrum is primarily Mendelian/genetic in etiology. (melkoniemi2000autosomalrecessivedisorder pages 1-2)
COL11A2 is expressed in inner-ear structures (including the tectorial membrane); pathogenic variants are linked to abnormal collagen distribution in this extracellular matrix, consistent with sensorineural hearing loss. (soh2022dominantsticklersyndrome. pages 8-10, li2001targeteddisruptionof pages 3-4)
A 2023 study used CRISPR loss-of-function zebrafish models and transgenic rescue to support pathogenicity of human missense variants: - Homozygous zebrafish col11a2 LOF alleles produce vertebral fusions; heterozygous deletion alleles also increase fusion penetrance (haploinsufficiency). (rebello2023col11a2asa pages 4-6) - Wildtype col11a2 transgenes suppress vertebral fusions, but patient missense-variant transgenes fail to rescue, providing functional support for variant pathogenicity and linking COL11A2 to vertebral development/mineralization boundary maintenance. (rebello2023col11a2asa pages 1-2, rebello2023col11a2asa pages 8-11)
GO Biological Process (suggested): - extracellular matrix organization (GO:0030198) - collagen fibril organization (GO:0030199) - cartilage development (GO:0051216) - skeletal system development (GO:0001501) - auditory receptor cell development / inner ear development (e.g., inner ear morphogenesis GO:0048839)
Cell Ontology (CL) (suggested): - chondrocyte (CL:0000138) (growth plate/articular cartilage involvement) (li2001targeteddisruptionof pages 6-8) - osteoblast (CL:0000062) (vertebral mineralization context in zebrafish) (rebello2023col11a2asa pages 8-11) - cochlear hair cell (CL:0000601) / supporting cells (for SNHL context; indirect) (acke2022hearinglossin pages 6-7)
Skeletal dysplasia workflows (generalizable to COL11A2): - A radiogenomics-era skeletal dysplasia cohort implemented tiered analysis: clinician-directed gene(s) on WES data → 222-gene virtual panel → HPO-driven agnostic exome search, emphasizing multidisciplinary radiology–genetics review; overall diagnostic yield was 53.3% (8/15) with 46.7% definite and 6.7% likely diagnoses. (BMC Med Genomics, 2021-06; https://doi.org/10.1186/s12920-021-00993-0) (sabir2021diagnosticyieldof pages 2-4) - Re-analysis of WES can yield additional diagnoses (~10–15% uplift in prior-negative cases), and WGS is increasingly used (especially trio WGS). (sabir2021diagnosticyieldof pages 9-12)
COL11A2 splice-region variant interpretation (functional validation): - For intronic/splice variants, minigene/exon-trapping assays are presented as a practical method when patient RNA is unavailable; this can materially affect ACMG/AMP classification (e.g., evidence of exon skipping/in-frame deletions). (Genes, 2020-12; https://doi.org/10.3390/genes11121513) (micale2020exontrappingassayimproves pages 11-13, micale2020exontrappingassayimproves pages 3-5)
2023 update relevant to diagnostics: - A 2023 congenital scoliosis/vertebral malformation study suggests including COL11A2 in gene lists/panels for vertebral malformations, supported by functional zebrafish rescue assays and noting incomplete penetrance in at least one family. (Human Molecular Genetics, 2023-07; https://doi.org/10.1093/hmg/ddad117) (rebello2023col11a2asa pages 2-4)
Quantitative survival/mortality estimates were not found in the retrieved evidence. Available sources emphasize chronic morbidity from: - Hearing impairment (risk of speech/language impact without early intervention) (sheppard2021sticklersyndrome pages 7-8) - Musculoskeletal degeneration/pain and early osteoarthritis (soh2022dominantsticklersyndrome. pages 8-10, su2023casereportautosomal pages 1-2)
No disease-modifying pharmacotherapy or gene therapy was identified in the retrieved sources.
Hearing and ENT management (Stickler/OSMED-relevant): - Management guidance emphasizes early otolaryngology and audiology evaluation (e.g., within 3–6 months for infants with cleft palate), repeated audiometry, and prompt treatment of otitis media with antibiotics; recurrent cases managed with ventilation tubes as indicated. (sheppard2021sticklersyndrome pages 7-8) - Hearing interventions: hearing aids/vibrotactile devices for milder losses, and cochlear implants may be considered for children >12 months with severe-to-profound deafness. (sheppard2021sticklersyndrome pages 7-8) - Given newborn screening may miss mild losses and childhood onset/progression can occur, ongoing surveillance beyond newborn screening is emphasized in hearing-focused reviews. (acke2022hearinglossin pages 4-6)
Cleft palate / craniofacial interventions: - Cleft palate surgery timing is individualized; one management source cites typical repair around 12–18 months, with near-universal need for speech therapy in cleft-affected children. (sheppard2021sticklersyndrome pages 8-9) - In recessive OSMED case management, specific interventions reported include palatoplasty and mandibular distraction in an affected child. (selvam2020novelcol11a2pathogenic pages 1-2)
Musculoskeletal management: - Evidence in retrieved sources supports risk of early arthropathy/osteoarthritis, implying orthopedic monitoring and symptomatic treatment; however, specific evidence-based algorithms for COL11A2 were not identified in retrieved sources. (soh2022dominantsticklersyndrome. pages 8-10)
No interventional clinical trials specific to COL11A2/OSMED/Stickler type 3 were identified in the retrieved ClinicalTrials.gov search results in this run (the returned trials were unrelated dental/implant studies). (clinical trial search output; not citeable as evidence)
Primary prevention is not applicable in the classic sense for a Mendelian disorder; prevention focuses on genetic counseling and reproductive options. - Genetic diagnosis supports cascade testing, recurrence-risk counseling, and consideration of prenatal or preimplantation genetic testing. (melkoniemi2000autosomalrecessivedisorder pages 6-9, gyokova2026prenatalmoleculardiagnosis pages 6-7) - Secondary/tertiary prevention includes early identification and management of hearing loss and middle-ear disease to reduce developmental impact, and proactive cleft feeding/speech interventions. (sheppard2021sticklersyndrome pages 7-8, sheppard2021sticklersyndrome pages 6-7)
No naturally occurring COL11A2-driven veterinary disease was identified in the retrieved evidence (a 2023 canine Stickler-like condition involved COL11A1, not COL11A2). (OpenTargets Search: Stickler syndrome,otospondylomegaepiphyseal dysplasia-COL11A2)
A Col11a2 targeted-disruption mouse model shows phenotypes consistent with COL11A2-related disease mechanisms: - Homozygotes lack intact α2(XI) chains and show reduced size, craniofacial changes, disorganized growth-plate chondrocytes, thinner articular cartilage, and hearing impairment (ABR-confirmed), with tectorial membrane collagen fibril disorganization cited as a mechanism. (Dev Dyn, 2001-10; https://doi.org/10.1002/dvdy.1178) (li2001targeteddisruptionof pages 3-4, li2001targeteddisruptionof pages 6-8)
A curated table of autosomal recessive OSMED features and frequencies is available in Selvam et al. (2020), including 10/10 SNHL and 0/10 ocular findings in the summarized cohort. (selvam2020novelcol11a2pathogenic media b73d0cc6)
References
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(selvam2020novelcol11a2pathogenic pages 1-2): Pavalan Selvam, Shekhar Singh, Angita Jain, Herjot Atwal, and Paldeep S. Atwal. Novel col11a2 pathogenic variants in a child with autosomal recessive otospondylomegaepiphyseal dysplasia: a review of the literature. Journal of Pediatric Genetics, 09:117-120, Oct 2020. URL: https://doi.org/10.1055/s-0039-1698446, doi:10.1055/s-0039-1698446. This article has 4 citations and is from a peer-reviewed journal.
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(melkoniemi2000autosomalrecessivedisorder pages 4-6): Miia Melkoniemi, Han G. Brunner, Sylvie Manouvrier, Raoul Hennekam, Andrea Superti-Furga, Helena Kääriäinen, Richard M. Pauli, Ton van Essen, Matthew L. Warman, Jacky Bonaventure, Peter Miny, and Leena Ala-Kokko. Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the col11a2 gene. American journal of human genetics, 66 2:368-77, Feb 2000. URL: https://doi.org/10.1086/302750, doi:10.1086/302750. This article has 107 citations and is from a highest quality peer-reviewed journal.
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(micale2020exontrappingassayimproves pages 1-3): Lucia Micale, Silvia Morlino, Annalisa Schirizzi, Emanuele Agolini, Grazia Nardella, Carmela Fusco, Stefano Castellana, Vito Guarnieri, Roberta Villa, Maria Francesca Bedeschi, Paola Grammatico, Antonio Novelli, and Marco Castori. Exon-trapping assay improves clinical interpretation of col11a1 and col11a2 intronic variants in stickler syndrome type 2 and otospondylomegaepiphyseal dysplasia. Genes, 11:1513, Dec 2020. URL: https://doi.org/10.3390/genes11121513, doi:10.3390/genes11121513. This article has 16 citations.
(selvam2020novelcol11a2pathogenic media b73d0cc6): Pavalan Selvam, Shekhar Singh, Angita Jain, Herjot Atwal, and Paldeep S. Atwal. Novel col11a2 pathogenic variants in a child with autosomal recessive otospondylomegaepiphyseal dysplasia: a review of the literature. Journal of Pediatric Genetics, 09:117-120, Oct 2020. URL: https://doi.org/10.1055/s-0039-1698446, doi:10.1055/s-0039-1698446. This article has 4 citations and is from a peer-reviewed journal.
(acke2022hearinglossin pages 4-6): Frederic R. E. Acke and Els M. R. De Leenheer. Hearing loss in stickler syndrome: an update. Genes, 13:1571, Sep 2022. URL: https://doi.org/10.3390/genes13091571, doi:10.3390/genes13091571. This article has 28 citations.
(sheppard2021sticklersyndrome pages 7-8): Mary B. Sheppard and Clair A. Francomano. Stickler syndrome. Cassidy and Allanson's Management of Genetic Syndromes, pages 915-926, Oct 2021. URL: https://doi.org/10.1002/9781119432692.ch56, doi:10.1002/9781119432692.ch56. This article has 0 citations.
(melkoniemi2000autosomalrecessivedisorder pages 2-4): Miia Melkoniemi, Han G. Brunner, Sylvie Manouvrier, Raoul Hennekam, Andrea Superti-Furga, Helena Kääriäinen, Richard M. Pauli, Ton van Essen, Matthew L. Warman, Jacky Bonaventure, Peter Miny, and Leena Ala-Kokko. Autosomal recessive disorder otospondylomegaepiphyseal dysplasia is associated with loss-of-function mutations in the col11a2 gene. American journal of human genetics, 66 2:368-77, Feb 2000. URL: https://doi.org/10.1086/302750, doi:10.1086/302750. This article has 107 citations and is from a highest quality peer-reviewed journal.
(micale2020exontrappingassayimproves pages 11-13): Lucia Micale, Silvia Morlino, Annalisa Schirizzi, Emanuele Agolini, Grazia Nardella, Carmela Fusco, Stefano Castellana, Vito Guarnieri, Roberta Villa, Maria Francesca Bedeschi, Paola Grammatico, Antonio Novelli, and Marco Castori. Exon-trapping assay improves clinical interpretation of col11a1 and col11a2 intronic variants in stickler syndrome type 2 and otospondylomegaepiphyseal dysplasia. Genes, 11:1513, Dec 2020. URL: https://doi.org/10.3390/genes11121513, doi:10.3390/genes11121513. This article has 16 citations.
(li2001targeteddisruptionof pages 3-4): Shi‐Wu Li, Masamine Takanosu, Machiko Arita, Yunhua Bao, Zhao‐Xia Ren, Alfred Maier, Darwin J. Prockop, and Richard Mayne. Targeted disruption of col11a2 produces a mild cartilage phenotype in transgenic mice: comparison with the human disorder otospondylomegaepiphyseal dysplasia (osmed). Developmental Dynamics, 222:141-152, Oct 2001. URL: https://doi.org/10.1002/dvdy.1178, doi:10.1002/dvdy.1178. This article has 59 citations and is from a peer-reviewed journal.
(rebello2023col11a2asa pages 4-6): Denise Rebello, Elizabeth Wohler, Vida Erfani, Guozhuang Li, Alexya N Aguilera, Alberto Santiago-Cornier, Sen Zhao, Steven W Hwang, Robert D Steiner, Terry Jianguo Zhang, Christina A Gurnett, Cathleen Raggio, Nan Wu, Nara Sobreira, Philip F Giampietro, and Brian Ciruna. Col11a2 as a candidate gene for vertebral malformations and congenital scoliosis. Human molecular genetics, 32:2913-2928, Jul 2023. URL: https://doi.org/10.1093/hmg/ddad117, doi:10.1093/hmg/ddad117. This article has 19 citations and is from a domain leading peer-reviewed journal.
(rebello2023col11a2asa pages 1-2): Denise Rebello, Elizabeth Wohler, Vida Erfani, Guozhuang Li, Alexya N Aguilera, Alberto Santiago-Cornier, Sen Zhao, Steven W Hwang, Robert D Steiner, Terry Jianguo Zhang, Christina A Gurnett, Cathleen Raggio, Nan Wu, Nara Sobreira, Philip F Giampietro, and Brian Ciruna. Col11a2 as a candidate gene for vertebral malformations and congenital scoliosis. Human molecular genetics, 32:2913-2928, Jul 2023. URL: https://doi.org/10.1093/hmg/ddad117, doi:10.1093/hmg/ddad117. This article has 19 citations and is from a domain leading peer-reviewed journal.
(rebello2023col11a2asa pages 8-11): Denise Rebello, Elizabeth Wohler, Vida Erfani, Guozhuang Li, Alexya N Aguilera, Alberto Santiago-Cornier, Sen Zhao, Steven W Hwang, Robert D Steiner, Terry Jianguo Zhang, Christina A Gurnett, Cathleen Raggio, Nan Wu, Nara Sobreira, Philip F Giampietro, and Brian Ciruna. Col11a2 as a candidate gene for vertebral malformations and congenital scoliosis. Human molecular genetics, 32:2913-2928, Jul 2023. URL: https://doi.org/10.1093/hmg/ddad117, doi:10.1093/hmg/ddad117. This article has 19 citations and is from a domain leading peer-reviewed journal.
(li2001targeteddisruptionof pages 6-8): Shi‐Wu Li, Masamine Takanosu, Machiko Arita, Yunhua Bao, Zhao‐Xia Ren, Alfred Maier, Darwin J. Prockop, and Richard Mayne. Targeted disruption of col11a2 produces a mild cartilage phenotype in transgenic mice: comparison with the human disorder otospondylomegaepiphyseal dysplasia (osmed). Developmental Dynamics, 222:141-152, Oct 2001. URL: https://doi.org/10.1002/dvdy.1178, doi:10.1002/dvdy.1178. This article has 59 citations and is from a peer-reviewed journal.
(acke2022hearinglossin pages 6-7): Frederic R. E. Acke and Els M. R. De Leenheer. Hearing loss in stickler syndrome: an update. Genes, 13:1571, Sep 2022. URL: https://doi.org/10.3390/genes13091571, doi:10.3390/genes13091571. This article has 28 citations.
(sabir2021diagnosticyieldof pages 2-4): Ataf H. Sabir, Elizabeth Morley, Jameela Sheikh, Alistair D. Calder, Ana Beleza-Meireles, Moira S. Cheung, Alessandra Cocca, Mattias Jansson, Suzanne Lillis, Yogen Patel, Shu Yau, Christine M. Hall, Amaka C. Offiah, and Melita Irving. Diagnostic yield of rare skeletal dysplasia conditions in the radiogenomics era. BMC Medical Genomics, Jun 2021. URL: https://doi.org/10.1186/s12920-021-00993-0, doi:10.1186/s12920-021-00993-0. This article has 23 citations and is from a peer-reviewed journal.
(sabir2021diagnosticyieldof pages 9-12): Ataf H. Sabir, Elizabeth Morley, Jameela Sheikh, Alistair D. Calder, Ana Beleza-Meireles, Moira S. Cheung, Alessandra Cocca, Mattias Jansson, Suzanne Lillis, Yogen Patel, Shu Yau, Christine M. Hall, Amaka C. Offiah, and Melita Irving. Diagnostic yield of rare skeletal dysplasia conditions in the radiogenomics era. BMC Medical Genomics, Jun 2021. URL: https://doi.org/10.1186/s12920-021-00993-0, doi:10.1186/s12920-021-00993-0. This article has 23 citations and is from a peer-reviewed journal.
(micale2020exontrappingassayimproves pages 3-5): Lucia Micale, Silvia Morlino, Annalisa Schirizzi, Emanuele Agolini, Grazia Nardella, Carmela Fusco, Stefano Castellana, Vito Guarnieri, Roberta Villa, Maria Francesca Bedeschi, Paola Grammatico, Antonio Novelli, and Marco Castori. Exon-trapping assay improves clinical interpretation of col11a1 and col11a2 intronic variants in stickler syndrome type 2 and otospondylomegaepiphyseal dysplasia. Genes, 11:1513, Dec 2020. URL: https://doi.org/10.3390/genes11121513, doi:10.3390/genes11121513. This article has 16 citations.
(sheppard2021sticklersyndrome pages 8-9): Mary B. Sheppard and Clair A. Francomano. Stickler syndrome. Cassidy and Allanson's Management of Genetic Syndromes, pages 915-926, Oct 2021. URL: https://doi.org/10.1002/9781119432692.ch56, doi:10.1002/9781119432692.ch56. This article has 0 citations.
(gyokova2026prenatalmoleculardiagnosis pages 6-7): Elitsa Gyokova, Eleonora Hristova-Atanasova, Zlatko Kirovakov, and Kamelia Dimitrova. Prenatal molecular diagnosis of col2a1-associated stickler syndrome: genotype–phenotype correlation in a resource-limited healthcare setting. International Journal of Molecular Sciences, 27:2227, Feb 2026. URL: https://doi.org/10.3390/ijms27052227, doi:10.3390/ijms27052227. This article has 0 citations.
(sheppard2021sticklersyndrome pages 6-7): Mary B. Sheppard and Clair A. Francomano. Stickler syndrome. Cassidy and Allanson's Management of Genetic Syndromes, pages 915-926, Oct 2021. URL: https://doi.org/10.1002/9781119432692.ch56, doi:10.1002/9781119432692.ch56. This article has 0 citations.
(sabir2021diagnosticyieldof pages 1-2): Ataf H. Sabir, Elizabeth Morley, Jameela Sheikh, Alistair D. Calder, Ana Beleza-Meireles, Moira S. Cheung, Alessandra Cocca, Mattias Jansson, Suzanne Lillis, Yogen Patel, Shu Yau, Christine M. Hall, Amaka C. Offiah, and Melita Irving. Diagnostic yield of rare skeletal dysplasia conditions in the radiogenomics era. BMC Medical Genomics, Jun 2021. URL: https://doi.org/10.1186/s12920-021-00993-0, doi:10.1186/s12920-021-00993-0. This article has 23 citations and is from a peer-reviewed journal.