COL11A2-related hearing loss encompasses autosomal dominant (DFNA13) and autosomal recessive (DFNB53) non-syndromic sensorineural hearing loss caused by mutations in COL11A2, which encodes the alpha-2 chain of type XI collagen. Type XI collagen is a critical structural component of the tectorial membrane in the cochlea, and its disruption leads to hearing impairment without systemic skeletal or ocular features. DFNA13 presents with non-progressive, predominantly mid-frequency sensorineural hearing loss due to dominant-negative missense mutations in the triple-helix domain. DFNB53 presents with prelingual, profound sensorineural hearing loss across all frequencies due to biallelic loss-of-function or missense mutations. The distinction from syndromic COL11A2 disorders (Stickler type III, OSMED) lies in the absence of skeletal dysplasia, craniofacial, or ocular manifestations, reflecting mutation-specific effects on collagen XI function.
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name: COL11A2-Related Hearing Loss
creation_date: '2026-04-04T12:00:00Z'
updated_date: '2026-04-04T18:00:00Z'
category: Mendelian
description: >
COL11A2-related hearing loss encompasses autosomal dominant (DFNA13) and autosomal
recessive (DFNB53) non-syndromic sensorineural hearing loss caused by mutations in
COL11A2, which encodes the alpha-2 chain of type XI collagen. Type XI collagen is a
critical structural component of the tectorial membrane in the cochlea, and its
disruption leads to hearing impairment without systemic skeletal or ocular features.
DFNA13 presents with non-progressive, predominantly mid-frequency sensorineural
hearing loss due to dominant-negative missense mutations in the triple-helix domain.
DFNB53 presents with prelingual, profound sensorineural hearing loss across all
frequencies due to biallelic loss-of-function or missense mutations. The distinction
from syndromic COL11A2 disorders (Stickler type III, OSMED) lies in the absence of
skeletal dysplasia, craniofacial, or ocular manifestations, reflecting
mutation-specific effects on collagen XI function.
disease_term:
preferred_term: COL11A2-related hearing loss
term:
id: MONDO:0011159
label: autosomal dominant nonsyndromic hearing loss 13
parents:
- Non-syndromic hereditary hearing loss
- Type XI collagenopathy
has_subtypes:
- name: DFNA13
display_name: DFNA13 (Autosomal Dominant)
description: >
Non-progressive, predominantly mid-frequency sensorineural hearing loss caused by
heterozygous missense mutations in the triple-helix domain of COL11A2. Onset is
typically prelingual, and hearing loss is stable over time.
- name: DFNB53
display_name: DFNB53 (Autosomal Recessive)
description: >
Prelingual, severe-to-profound sensorineural hearing loss across all frequencies,
caused by biallelic COL11A2 mutations. Often identified in consanguineous families
with homozygous mutations. No syndromic features.
inheritance:
- name: Autosomal Dominant (DFNA13)
inheritance_term:
preferred_term: Autosomal dominant inheritance
term:
id: HP:0000006
label: Autosomal dominant inheritance
description: >
DFNA13 follows autosomal dominant inheritance. Heterozygous missense mutations in
the triple-helix domain of COL11A2 act through a dominant-negative mechanism,
disrupting collagen XI assembly in the tectorial membrane and causing
mid-frequency sensorineural hearing loss.
evidence:
- reference: PMID:10581026
reference_title: "Mutations in COL11A2 cause non-syndromic hearing loss (DFNA13)."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "We found two families (one American and one Dutch) with autosomal dominant, non-syndromic hearing loss to have mutations in COL11A2 that are predicted to affect the triple-helix domain of the collagen protein."
explanation: Original identification of COL11A2 as the DFNA13 gene, establishing autosomal dominant inheritance in two unrelated families.
- name: Autosomal Recessive (DFNB53)
inheritance_term:
preferred_term: Autosomal recessive inheritance
term:
id: HP:0000007
label: Autosomal recessive inheritance
description: >
DFNB53 follows autosomal recessive inheritance. Biallelic COL11A2 mutations
(homozygous or compound heterozygous) cause complete or near-complete loss of
alpha-2(XI) collagen function, resulting in severe-to-profound prelingual hearing loss.
evidence:
- reference: PMID:16033917
reference_title: "Mutation of COL11A2 causes autosomal recessive non-syndromic hearing loss at the DFNB53 locus."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Homozygosity for the P621T mutation of COL11A2 was present in all deaf persons in this family; this same variation was absent in 269 Iranian controls."
explanation: First identification of biallelic COL11A2 mutation causing autosomal recessive non-syndromic hearing loss in a consanguineous Iranian family.
- reference: PMID:25633957
reference_title: "Novel mutations confirm that COL11A2 is responsible for autosomal recessive non-syndromic hearing loss DFNB53."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "All homozygous individuals in those families had early onset profound hearing loss across all frequencies without syndromic findings."
explanation: Confirms DFNB53 with novel mutations in two additional consanguineous families, establishing the non-syndromic nature.
pathophysiology:
- name: COL11A2 Dominant-Negative Disruption of Tectorial Membrane
description: >
In DFNA13, heterozygous missense mutations in the triple-helix domain of COL11A2
produce structurally abnormal alpha-2(XI) collagen chains that are incorporated
into type XI collagen heterotrimers but disrupt normal fibril organization. In the
cochlea, type XI collagen is essential for the structural integrity of the tectorial
membrane, a gelatinous extracellular matrix overlying the organ of Corti.
Dominant-negative mutations cause loss of organized collagen fibril architecture in
the tectorial membrane, altering its mechanical properties and impairing sound
transduction particularly at mid-frequencies.
gene:
preferred_term: COL11A2
description: >
Collagen type XI alpha-2 chain, a component of type XI collagen heterotrimers
essential for tectorial membrane structure.
modifier: DECREASED
term:
id: hgnc:2187
label: COL11A2
cell_types:
- preferred_term: Cochlear hair cell
term:
id: CL:0000202
label: auditory hair cell
biological_processes:
- preferred_term: Collagen fibril organization
term:
id: GO:0030199
label: collagen fibril organization
evidence:
- reference: PMID:10581026
reference_title: "Mutations in COL11A2 cause non-syndromic hearing loss (DFNA13)."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Mice with a targeted disruption of Col11a2 also were shown to have hearing loss. Electron microscopy of the tectorial membrane of these mice revealed loss of organization of the collagen fibrils."
explanation: Col11a2 knockout mice demonstrate hearing loss with ultrastructural tectorial membrane disorganization, providing a mechanistic link between collagen XI dysfunction and hearing impairment.
- reference: PMID:10581026
reference_title: "Mutations in COL11A2 cause non-syndromic hearing loss (DFNA13)."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "In both families, deafness is non-progressive and predominantly affects middle frequencies."
explanation: Establishes the characteristic mid-frequency hearing loss pattern of DFNA13, consistent with tectorial membrane involvement in frequency-specific cochlear tuning.
downstream:
- target: Non-Progressive Mid-Frequency Sensorineural Hearing Loss
- name: COL11A2 Biallelic Loss of Function in Tectorial Membrane
description: >
In DFNB53, biallelic loss-of-function or damaging missense mutations in COL11A2
result in absent or severely dysfunctional alpha-2(XI) collagen chains. The
resulting deficiency of normal type XI collagen in the tectorial membrane causes
severe structural disruption, leading to profound hearing loss across all frequencies.
Unlike the milder dominant-negative effect of DFNA13, complete loss of COL11A2
function produces a more severe and broader-spectrum hearing deficit.
gene:
preferred_term: COL11A2
description: >
Collagen type XI alpha-2 chain. Biallelic loss leads to complete absence of
functional alpha-2(XI) chains and severe tectorial membrane defects.
modifier: DECREASED
term:
id: hgnc:2187
label: COL11A2
cell_types:
- preferred_term: Cochlear hair cell
term:
id: CL:0000202
label: auditory hair cell
biological_processes:
- preferred_term: Collagen fibril organization
term:
id: GO:0030199
label: collagen fibril organization
evidence:
- reference: PMID:16033917
reference_title: "Mutation of COL11A2 causes autosomal recessive non-syndromic hearing loss at the DFNB53 locus."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The P621T mutation of COL11A2 affects the Y position of the canonical -Gly-X-Y- repeat in collagens. It lies near the amino-terminus of the triple helical region and causes ARNSHL."
explanation: Identifies the molecular location of the first DFNB53 mutation within the collagen triple helix, establishing the pathogenic mechanism.
- reference: PMID:25633957
reference_title: "Novel mutations confirm that COL11A2 is responsible for autosomal recessive non-syndromic hearing loss DFNB53."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The novel p.Ala37Ser is the first missense mutation located in the NC4 domain of the COL11A2 protein."
explanation: Identifies a novel functional domain (NC4) affected by DFNB53 mutations, broadening understanding of COL11A2-related hearing loss mechanisms.
downstream:
- target: Prelingual Profound Sensorineural Hearing Loss
- name: Non-Progressive Mid-Frequency Sensorineural Hearing Loss
description: >
The characteristic audiometric pattern of DFNA13 is a non-progressive,
prelingual sensorineural hearing loss that predominantly affects middle
frequencies. This pattern likely reflects the frequency-specific mechanical
properties of the tectorial membrane, which relies on collagen XI for its
gradient of stiffness along the cochlear spiral.
evidence:
- reference: PMID:10581026
reference_title: "Mutations in COL11A2 cause non-syndromic hearing loss (DFNA13)."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "In both families, deafness is non-progressive and predominantly affects middle frequencies."
explanation: Defines the audiometric signature of DFNA13.
- reference: PMID:10581026
reference_title: "Mutations in COL11A2 cause non-syndromic hearing loss (DFNA13)."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "tectorial membrane abnormalities may be one aetiology of sensorineural hearing loss primarily affecting the mid-frequencies."
explanation: Links mid-frequency hearing loss to tectorial membrane pathology as a specific audiologic signature.
- name: Prelingual Profound Sensorineural Hearing Loss
description: >
DFNB53 causes prelingual, severe-to-profound sensorineural hearing loss
affecting all frequencies. The severity reflects near-complete loss of
alpha-2(XI) collagen function in the tectorial membrane.
evidence:
- reference: PMID:25633957
reference_title: "Novel mutations confirm that COL11A2 is responsible for autosomal recessive non-syndromic hearing loss DFNB53."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "All homozygous individuals in those families had early onset profound hearing loss across all frequencies without syndromic findings."
explanation: Confirms the audiometric severity and prelingual onset in DFNB53 patients.
genetic:
- name: COL11A2 Mutations
association: Causative
features: >
DFNA13 is caused by heterozygous missense mutations affecting the triple-helix
domain (Gly-X-Y repeats). DFNB53 is caused by homozygous or compound
heterozygous mutations including missense mutations in the triple-helix domain
and in the NC4 domain. Phenotype-genotype comparisons suggest that mutation type
and location are critical determinants of whether the phenotype is syndromic or
non-syndromic.
gene_term:
preferred_term: COL11A2
term:
id: hgnc:2187
label: COL11A2
evidence:
- reference: PMID:16033917
reference_title: "Mutation of COL11A2 causes autosomal recessive non-syndromic hearing loss at the DFNB53 locus."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "This finding suggests that mutation type and location are critical determinants in defining the phenotype of COL11A2 associated diseases."
explanation: Establishes the genotype-phenotype correlation principle for COL11A2 mutations.
- reference: PMID:25633957
reference_title: "Novel mutations confirm that COL11A2 is responsible for autosomal recessive non-syndromic hearing loss DFNB53."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Nonsense and frameshift mutations cause the very severe phenotypic effects associated with COL11A2 gene such as OSMED syndrome"
explanation: Differentiates the severe syndromic phenotypes (truncating mutations) from the non-syndromic hearing loss (missense mutations).
phenotypes:
- name: Sensorineural Hearing Impairment
description: >
Sensorineural hearing loss is the defining feature of both DFNA13 and DFNB53.
In DFNA13, hearing loss is non-progressive and predominantly affects mid-frequencies.
In DFNB53, hearing loss is prelingual, severe-to-profound, and affects all frequencies.
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 demonstrates that COL11A2 mutations have the highest association with hearing impairment among Stickler-related collagen genes. Note that the 94.1% figure is derived from Stickler syndrome patients, not isolated non-syndromic deafness; it is cited here as supportive evidence for the auditory impact of COL11A2 mutations generally.
- reference: PMID:10581026
reference_title: "Mutations in COL11A2 cause non-syndromic hearing loss (DFNA13)."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "In both families, deafness is non-progressive and predominantly affects middle frequencies."
explanation: Characterizes the DFNA13 hearing loss pattern as sensorineural, non-progressive, and mid-frequency.
treatments:
- name: Hearing Aids
description: >
Hearing aids are the primary management for DFNA13. For DFNB53, conventional
hearing aids may be insufficient due to the severity of hearing loss.
treatment_term:
preferred_term: hearing aid usage
term:
id: MAXO:0009030
label: hearing aid usage
- name: Cochlear Implantation
description: >
Cochlear implantation is considered for DFNB53 patients with profound hearing
loss who do not benefit from conventional amplification.
treatment_term:
preferred_term: cochlear device implantation
term:
id: MAXO:0009025
label: cochlear device implantation
- name: Genetic Counseling
description: >
Genetic counseling is important for families with COL11A2-related hearing loss
to clarify inheritance pattern (dominant vs. recessive) and recurrence risk.
treatment_term:
preferred_term: genetic counseling
term:
id: MAXO:0000079
label: genetic counseling
notes: >
COL11A2-related hearing loss must be distinguished from syndromic COL11A2 disorders
(Stickler syndrome type III, OSMED) by the absence of skeletal dysplasia,
craniofacial anomalies, and ocular involvement. Carriers of DFNB53 mutations may
show subtle late-onset sensorineural hearing loss, suggesting semi-dominant
expression at the auditory level.
Disease name: COL11A2-Related Hearing Loss (Mendelian; spectrum includes nonsyndromic and syndromic presentations) (mcguirt1999mutationsincol11a2 pages 1-2, chen2005mutationofcol11a2 pages 2-5, iwasa2015nonocularsticklersyndrome pages 3-4).
Note on identifiers: In the evidence retrieved in this run, authoritative ontology/disease-resource identifiers (MONDO, Orphanet, ICD-10/11, MeSH, OMIM IDs) were not directly available; therefore this report anchors the condition to well-established deafness locus identifiers DFNA13 (autosomal dominant) and DFNB53 (autosomal recessive), and to COL11A2-related non-ocular Stickler syndrome / Stickler syndrome type 3 and OSMED as described in the clinical genetics literature (mcguirt1999mutationsincol11a2 pages 1-2, chen2005mutationofcol11a2 pages 2-5, iwasa2015nonocularsticklersyndrome pages 3-4, acke2022hearinglossin pages 4-6).
COL11A2-related hearing loss refers to hereditary hearing impairment caused by pathogenic variants in COL11A2, encoding the α2 chain of type XI collagen, an extracellular-matrix (ECM) fibrillar collagen that contributes to cochlear structures including the tectorial membrane (TM) (masaki2009col11a2deletionreveals pages 1-2, sellon2019thetectorialmembrane pages 1-3).
Clinically, COL11A2 pathogenic variants can cause: - Autosomal dominant nonsyndromic hearing loss (DFNA13) (mcguirt1999mutationsincol11a2 pages 1-2, mcguirt1999mutationsincol11a2 pages 5-6). - Autosomal recessive nonsyndromic hearing loss (DFNB53) (chen2005mutationofcol11a2 pages 2-5). - Syndromic disease with hearing loss, including COL11A2-related non-ocular Stickler syndrome (Stickler syndrome type 3) and COL11A2-associated skeletal dysplasias (e.g., OSMED) in the broader disease spectrum (iwasa2015nonocularsticklersyndrome pages 3-4, acke2022hearinglossin pages 4-6, chen2005mutationofcol11a2 pages 2-5).
The information summarized here is derived from aggregated disease-level reviews plus individual/family-level primary clinical genetics reports, and animal model/mechanistic studies (acke2022hearinglossin pages 4-6, acke2012hearingimpairmentin pages 10-10, mcguirt1999mutationsincol11a2 pages 1-2, chen2005mutationofcol11a2 pages 2-5, masaki2009col11a2deletionreveals pages 1-2).
Primary cause: germline pathogenic variants in COL11A2 (mcguirt1999mutationsincol11a2 pages 1-2, chen2005mutationofcol11a2 pages 2-5, iwasa2015nonocularsticklersyndrome pages 3-4).
Inheritance: - Autosomal dominant (AD): DFNA13; also AD non-ocular Stickler syndrome reported with COL11A2 variants (mcguirt1999mutationsincol11a2 pages 1-2, iwasa2015nonocularsticklersyndrome pages 3-4). - Autosomal recessive (AR): DFNB53 (chen2005mutationofcol11a2 pages 2-5).
Pathogenic variant examples (from primary studies): - DFNA13 (AD): p.Arg549Cys and p.Gly323Glu (McGuirt et al., 1999; DOI: https://doi.org/10.1038/70516; publication month/year: Dec 1999) (mcguirt1999mutationsincol11a2 pages 1-2, mcguirt1999mutationsincol11a2 pages 4-5). - DFNB53 (AR): p.Pro621Thr (Chen et al., 2005; DOI: https://doi.org/10.1136/jmg.2005.032615; Oct 2005) (chen2005mutationofcol11a2 pages 2-5). - Non-ocular Stickler syndrome (AD) example: a COL11A2 frameshift deletion reported as p.1312_1315del4 (Iwasa et al., 2015; DOI: https://doi.org/10.1177/0003489415575044; Mar 2015) (iwasa2015nonocularsticklersyndrome pages 3-4).
For this Mendelian disorder, genotype is the dominant determinant; the retrieved sources did not provide human data on environmental risk modifiers or protective factors specific to COL11A2-related hearing loss.
Nevertheless, recent experimental cochlear proteomics suggests that noise exposure can perturb ECM/collagen proteins including COL11A2, implicating ECM remodeling as a shared axis for genetic and environmental injury to hearing (Shi et al., 2023; DOI: https://doi.org/10.1007/s12033-022-00557-2; Oct 2023) (shi2023acutenoisecauses pages 1-4, shi2023acutenoisecauses pages 13-19).
Suggested HPO terms (core hearing): - Sensorineural hearing impairment (HP:0000407) - Mid-frequency hearing loss (HP:0040117) (if curated as audiogram phenotype) - Congenital onset (HP:0003577) - Non-progressive (HP:0003680)
Suggested HPO terms: - Sensorineural hearing impairment (HP:0000407) - Profound hearing impairment (HP:0000405) - Prelingual onset (HP:0003623)
A Japanese family report and a Stickler-focused review indicate that COL11A2-related Stickler phenotypes are frequently associated with hearing loss: - Frequency in non-ocular Stickler (as stated in the family report): “94.1% of non-ocular Stickler syndrome patients have hearing loss.” (iwasa2015nonocularsticklersyndrome pages 3-4). - Course: in the reported family, childhood-onset, slowly progressive, mild-to-moderate hearing loss with good speech discrimination and benefit from hearing aids (iwasa2015nonocularsticklersyndrome pages 3-4). - Review-level audiogram pattern (Stickler type 2/3): mild–moderate low/mid-frequency loss and moderate–severe high-frequency loss; U-shaped patterns reported in some cases (acke2022hearinglossin pages 4-6).
Suggested HPO terms (Stickler-related): - Sensorineural hearing impairment (HP:0000407) - Progressive hearing impairment (HP:0001730) - Midface hypoplasia (HP:0000347)
Specific validated QoL instrument data (e.g., SF-36, EQ-5D, PROMIS) were not present in the retrieved evidence. However, because Stickler syndrome involves multisystem features (including vision impairment in many types), a 2012 systematic review emphasized the importance of auditory follow-up. - Direct quote from abstract: “Hearing impairment in patients with Stickler syndrome is common. … Regular auditory follow-up is strongly advised, particularly because many Stickler patients are visually impaired.” (Acke et al., 2012; DOI: https://doi.org/10.1186/1750-1172-7-84; Oct 2012) (acke2012hearingimpairmentin pages 10-10).
No COL11A2-specific modifier-gene or epigenetic-disease mechanisms were described in the retrieved evidence.
While not evidence for causation in COL11A2 Mendelian disease, a recent cochlear proteomics study provides mechanistic context for ECM vulnerability: - In an acute impulse-noise guinea pig model, COL11A2 (along with other ECM proteins) was among hearing-related proteins that changed after noise exposure (shi2023acutenoisecauses pages 1-4, shi2023acutenoisecauses pages 13-19). - ABR threshold shift (example statistic): click threshold increased from 26.88 ± 8.08 dB (pre) to 57.00 ± 6.78 dB (day 1), with partial recovery by day 7 (shi2023acutenoisecauses pages 13-19). - The authors conclude: “Impulse noise can affect the expression of differential proteins through focal adhesion pathways.” (shi2023acutenoisecauses pages 1-4).
Implication: ECM/focal-adhesion signaling changes provide a plausible intersection between ECM structural genes (e.g., COL11A2) and acquired cochlear injury pathways, though direct gene–environment interaction data in humans were not retrieved (shi2023acutenoisecauses pages 10-13, shi2023acutenoisecauses pages 1-4).
A COL11A2-related non-ocular Stickler report emphasizes that COL11A2 is expressed in the tectorial membrane, and frames the impairment as potentially due to altered sound transmission within the cochlea (“cochlear conductive hearing loss”) rather than primary hair cell expression (iwasa2015nonocularsticklersyndrome pages 4-5).
A key mechanistic study demonstrated that Col11a2 deletion changes TM collagen architecture and collapses mechanical anisotropy: - Functional impact: DPOAE and ABR were reduced by approximately 30–50 dB across frequencies (masaki2009col11a2deletionreveals pages 1-2). - Mechanical impact: radial shear impedance decreased by 5.5 ± 0.8 dB and longitudinal shear impedance by 3.3 ± 0.3 dB; the radial-to-longitudinal impedance ratio fell from 1.8 ± 0.7 (WT) to 1.0 ± 0.1 (Col11a2−/−) (Masaki et al., 2009; DOI: https://doi.org/10.1016/j.bpj.2009.02.056; Jun 2009) (masaki2009col11a2deletionreveals pages 1-2, masaki2009col11a2deletionreveals media 7efb6948).
Causal chain (evidence-backed): COL11A2 pathogenic variant or loss → abnormal type XI collagen contribution to TM radial collagen fibrils → altered TM anisotropy/coupling and cochlear micromechanics → elevated auditory thresholds and characteristic audiometric patterns (especially mid-frequency deficits in DFNA13) (masaki2009col11a2deletionreveals pages 1-2, mcguirt1999mutationsincol11a2 pages 1-2).
In situ hybridization in developing mouse cochlea localized Col11a1/Col11a2 mRNA primarily to epithelial ridge and lateral wall structures that contribute to TM and cochlear ECM: - Greater epithelial ridge as main source contributing to TM; later localization includes inner sulcus, Claudius’ cells, and Boettcher’s cells (Shpargel et al., 2004; DOI: https://doi.org/10.1080/00016480410016162; Mar 2004) (shpargel2004col11a1andcol11a2 pages 1-3, shpargel2004col11a1andcol11a2 pages 3-4). - No hybridization detected in hair cells (shpargel2004col11a1andcol11a2 pages 3-4).
Suggested ontology mappings: - GO Biological Process: extracellular matrix organization (GO:0030198); collagen fibril organization (GO:0030199) - GO Cellular Component: tectorial membrane (GO:0060089) (if used in a curated set); extracellular matrix (GO:0031012) - Uberon anatomical structures: cochlea (UBERON:0001767); tectorial membrane (UBERON:0004953) - Cell Ontology (examples aligned to cited structures): epithelial cell (CL:0000066) for ridge/sulcus epithelia; fibroblast (CL:0000057) relevant to spiral ligament ECM production (note: the retrieved expression study names specific cochlear epithelial regions but does not provide CL identifiers) (shpargel2004col11a1andcol11a2 pages 3-4).
Primary: inner ear/cochlea, especially ECM structures controlling micromechanics: the tectorial membrane (masaki2009col11a2deletionreveals pages 1-2).
UBERON suggestions: cochlea (UBERON:0001767); organ of Corti (UBERON:0001890); tectorial membrane (UBERON:0004953).
Congenital onset and non-progressive course were reported in DFNA13 families (mcguirt1999mutationsincol11a2 pages 1-2).
Prelingual onset and non-progressive course were described in DFNB53 family L622 (chen2005mutationofcol11a2 pages 2-5).
In one family: childhood-onset and slowly progressive hearing loss (iwasa2015nonocularsticklersyndrome pages 3-4). In Stickler type 2/3 review synthesis, onset is “early” and losses may be missed by newborn screening if mild (acke2022hearinglossin pages 4-6).
No prevalence/incidence estimates specific to COL11A2-related hearing loss were available in the retrieved evidence. However, a Stickler systematic review quantified hearing loss across Stickler syndrome case literature: - Direct quote from abstract: “Hearing loss was found in 62.9% [of Stickler syndrome patients], mostly mild to moderate when reported.” (Acke et al., 2012; DOI: https://doi.org/10.1186/1750-1172-7-84; Oct 2012) (acke2012hearingimpairmentin pages 10-10).
The non-ocular Stickler report describes clinical confusion with Binder syndrome due to orofacial appearance, highlighting the role of genomic testing for correct syndromic diagnosis (iwasa2015nonocularsticklersyndrome pages 3-4).
Human survival/mortality endpoints are not relevant/available in the retrieved evidence; the primary morbidity is hearing impairment and (in syndromic forms) connective-tissue manifestations. Prognosis for hearing stability varies by entity: non-progressive DFNA13 and DFNB53 in cited families vs slowly progressive hearing loss in a non-ocular Stickler family report (mcguirt1999mutationsincol11a2 pages 1-2, chen2005mutationofcol11a2 pages 2-5, iwasa2015nonocularsticklersyndrome pages 3-4).
Hearing rehabilitation (amplification): - In an AD COL11A2-related non-ocular Stickler family, patients used hearing aids with favorable speech discrimination outcomes, and the authors recommended hearing aids as appropriate management (Iwasa et al., 2015; DOI: https://doi.org/10.1177/0003489415575044; Mar 2015) (iwasa2015nonocularsticklersyndrome pages 3-4).
Cochlear implantation: No cochlear implant outcome data were present in the retrieved evidence for COL11A2-specific hearing loss.
MAXO suggestions: - Hearing aid therapy (MAXO:0000605) (term suggestion; MAXO ID may require verification in a MAXO browser).
No COL11A2-specific interventional clinical trials were identified in the retrieved clinical-trials search during this run.
A 2023 cochlear single-cell atlas emphasizes translational motivation for gene-specific targeted therapies in hereditary deafness generally: - Direct quote from abstract/significance: “One major challenge is the implementation of these therapies for diverse isolated and syndromic forms of hearing loss, taking into account the spatial and temporal patterns of expression of the causal gene…” (Jean et al., 2023; DOI: https://doi.org/10.1073/pnas.2221744120; Jun 2023) (jean2023singlecelltranscriptomicprofiling pages 6-7).
No COL11A2-specific prevention trials or environmental prevention strategies were described in the retrieved evidence. For Mendelian disease, prevention is typically via genetic counseling and reproductive options; however, detailed guidance documents were not retrieved in this run.
No naturally occurring veterinary COL11A2 hearing-loss syndromes were retrieved.
Mouse models: - Col11a2 knockout/deletion models show auditory threshold elevations and TM collagen disorganization (mcguirt1999mutationsincol11a2 pages 5-6, masaki2009col11a2deletionreveals pages 1-2). - Mechanistic TM study quantified loss of anisotropy and associated ABR/DPOAE reductions (masaki2009col11a2deletionreveals pages 1-2).
Zebrafish (non-hearing phenotype in retrieved evidence): - A 2023 study used CRISPR zebrafish col11a2 loss-of-function for vertebral development; it supports broader COL11A2 roles in cartilage/ECM but does not provide hearing phenotypes in the excerpted evidence (shi2023acutenoisecauses pages 10-13).
The most coherent mechanistic model supported by both human genetics and animal biophysics is that many COL11A2-related hearing phenotypes arise from ECM structural defects in the tectorial membrane, altering cochlear mechanics rather than primary hair-cell dysfunction. This aligns: (i) with developmental expression patterns that do not localize Col11a2 mRNA to hair cells (shpargel2004col11a1andcol11a2 pages 3-4), (ii) with TM mechanical anisotropy collapse and large threshold shifts in Col11a2−/− mice (masaki2009col11a2deletionreveals pages 1-2), and (iii) with the characteristic mid-frequency “cookie-bite” audiograms in DFNA13 families (mcguirt1999mutationsincol11a2 pages 1-2).
| Entity/label | Inheritance | Key COL11A2 variant examples (HGVS protein) | Core hearing phenotype | Extra-auditory features | Key mechanistic note (tectorial membrane/ECM) | Key citations (DOI; year) |
|---|---|---|---|---|---|---|
| DFNA13 (COL11A2-related nonsyndromic hearing loss) | Autosomal dominant | p.Arg549Cys; p.Gly323Glu | Congenital, non-progressive, predominantly mid-frequency sensorineural loss with characteristic “cookie-bite” audiogram; severity mild to moderately severe in reported family (mcguirt1999mutationsincol11a2 pages 1-2, mcguirt1999mutationsincol11a2 pages 5-6) | No syndromic findings reported in the cited families; specifically no midface hypoplasia, cleft palate, precocious arthritis, short stature, or ocular abnormalities (mcguirt1999mutationsincol11a2 pages 1-2) | COL11A2 encodes type XI collagen in cochlear ECM; loss/disorganization of tectorial-membrane collagen fibrils is implicated, and Col11a2-null mice show threshold elevation with tectorial-membrane abnormalities (mcguirt1999mutationsincol11a2 pages 1-2, mcguirt1999mutationsincol11a2 pages 5-6, masaki2009col11a2deletionreveals pages 1-2) | McGuirt et al., 10.1038/70516; 1999 (mcguirt1999mutationsincol11a2 pages 1-2, mcguirt1999mutationsincol11a2 pages 5-6); Masaki et al., 10.1016/j.bpj.2009.02.056; 2009 (masaki2009col11a2deletionreveals pages 1-2) |
| DFNB53 (COL11A2-related nonsyndromic hearing loss) | Autosomal recessive | p.Pro621Thr | Prelingual, profound, sensorineural, non-progressive hearing loss in the reported family (chen2005mutationofcol11a2 pages 2-5) | No ocular abnormalities; no midface hypoplasia or palatal clefting; normal stature; no bone dysplasia on survey; vestibular function normal (chen2005mutationofcol11a2 pages 2-5) | Missense change in the collagen triple-helical repeat of type XI collagen; supports a cochlear ECM structural mechanism, consistent with COL11A2-related tectorial-membrane dysfunction (chen2005mutationofcol11a2 pages 2-5, masaki2009col11a2deletionreveals pages 1-2) | Chen et al., 10.1136/jmg.2005.032615; 2005 (chen2005mutationofcol11a2 pages 2-5); Masaki et al., 10.1016/j.bpj.2009.02.056; 2009 (masaki2009col11a2deletionreveals pages 1-2) |
| COL11A2-related Stickler syndrome type 3 / non-ocular Stickler syndrome | Autosomal dominant | p.1312_1315del4 | Childhood-onset, slowly progressive, mild-to-moderate hearing loss; relatively good speech discrimination; in Stickler type 2/3 generally early-onset, often mild-moderate at low/mid frequencies and moderate-severe at high frequencies, sometimes U-shaped audiogram (iwasa2015nonocularsticklersyndrome pages 3-4, acke2022hearinglossin pages 4-6) | Orofacial features including maxillary/midfacial hypoplasia; non-ocular Stickler by definition lacks ocular involvement (iwasa2015nonocularsticklersyndrome pages 3-4) | COL11A2 is a type XI collagen chain expressed in the otic vesicle/tectorial membrane; pathogenic variants likely alter cochlear mechanics and can produce a “cochlear conductive”/ECM-mediated phenotype (iwasa2015nonocularsticklersyndrome pages 3-4, acke2022hearinglossin pages 4-6) | Iwasa et al., 10.1177/0003489415575044; 2015 (iwasa2015nonocularsticklersyndrome pages 3-4); Acke & De Leenheer, 10.3390/genes13091571; 2022 (acke2022hearinglossin pages 4-6) |
| OSMED (otospondylomegaepiphyseal dysplasia), COL11A2-related | Usually autosomal recessive; biallelic pathogenic variants classically implicated in cited evidence | No specific OSMED variant example available in the allowed evidence set | Hearing impairment is part of the COL11A2 disease spectrum, but detailed onset/progression/audiogram data for OSMED are not provided in the allowed evidence set (chen2005mutationofcol11a2 pages 2-5) | Skeletal dysplasia/bone involvement defines OSMED; Chen et al. cite OSMED as a COL11A2-associated extra-auditory phenotype distinct from DFNB53, but the allowed evidence set does not provide phenotype granularity (chen2005mutationofcol11a2 pages 2-5) | Likely reflects more widespread type XI collagen dysfunction in cartilage and cochlear ECM than isolated nonsyndromic deafness; mechanistic consistency with tectorial-membrane collagen disruption is supported by Col11a2 model data (chen2005mutationofcol11a2 pages 2-5, masaki2009col11a2deletionreveals pages 1-2) | Chen et al., 10.1136/jmg.2005.032615; 2005 (chen2005mutationofcol11a2 pages 2-5); Masaki et al., 10.1016/j.bpj.2009.02.056; 2009 (masaki2009col11a2deletionreveals pages 1-2) |
Table: This table summarizes the main COL11A2-associated hearing loss entities across nonsyndromic and syndromic presentations, highlighting inheritance, representative variants, phenotype patterns, extra-auditory findings, and cochlear ECM/tectorial membrane mechanisms. It is useful as a compact genotype-phenotype reference for knowledge-base curation.
A cropped panel from Masaki et al. (2009) illustrates the shear impedance changes underlying the loss of TM anisotropy in Col11a2−/− mice (masaki2009col11a2deletionreveals media 7efb6948).
References
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