👪

Inheritance

2

Autosomal Dominant (DFNA13) HP:0000006

DFNA13 follows autosomal dominant inheritance. Heterozygous missense mutations in the triple-helix domain of COL11A2 disrupt collagen XI function and cause mid-frequency sensorineural hearing loss.

Autosomal dominant inheritance

Show evidence (1 reference)

PMID:10581026 SUPPORT Human Clinical

"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."

Original identification of COL11A2 as the DFNA13 gene, establishing autosomal dominant inheritance in two unrelated families.

Autosomal Recessive (DFNB53) HP:0000007

DFNB53 follows autosomal recessive inheritance. Biallelic COL11A2 mutations (homozygous or compound heterozygous) impair alpha-2(XI) collagen function, resulting in severe-to-profound prelingual hearing loss.

Autosomal recessive inheritance

Show evidence (2 references)

PMID:16033917 SUPPORT Human Clinical

"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."

First identification of biallelic COL11A2 mutation causing autosomal recessive non-syndromic hearing loss in a consanguineous Iranian family.

PMID:25633957 SUPPORT Human Clinical

"All homozygous individuals in those families had early onset profound hearing loss across all frequencies without syndromic findings."

Confirms DFNB53 with novel mutations in two additional consanguineous families, establishing the non-syndromic nature.

◆

Subtypes

2

DFNA13 (Autosomal Dominant) MONDO:0011159

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.

Show evidence (1 reference)

PMID:10581026 SUPPORT Human Clinical

"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."

Two families establish the autosomal dominant DFNA13 subtype.

DFNB53 (Autosomal Recessive) MONDO:0012333

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.

Show evidence (1 reference)

PMID:25633957 SUPPORT Human Clinical

"All homozygous individuals in those families had early onset profound hearing loss across all frequencies without syndromic findings."

Homozygous affected individuals establish the recessive DFNB53 subtype.

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Discussions and Knowledge Gaps

1

Do heterozygous DFNB53 variants reproducibly accelerate adult-onset sensorineural hearing loss, indicating semi-dominant auditory expression?

KNOWLEDGE GAP OPEN dfnb53_carrier_auditory_effects

Attached to

inheritance#Autosomal Recessive (DFNB53)

One DFNB53 family showed progressive hearing loss in heterozygous carriers, but larger and longitudinal carrier cohorts are needed to distinguish a variant effect from ordinary age- and exposure-related hearing loss.

Show evidence (1 reference)

PMID:25633957 SUPPORT Human Clinical

"Interestingly, in family FT3, carriers of the p.Ala37Ser mutation had apparently progressive sensorineural HL after age 30 years."

The family provides direct evidence of later-onset hearing loss in heterozygous carriers.

⚙

Pathophysiology

4

Dominant COL11A2 Disruption of Tectorial Membrane

In DFNA13, heterozygous variants predicted to affect the collagen triple-helix domain disrupt COL11A2 function. Model-organism evidence links Col11a2 disruption to loss of organized collagen fibrils in the cochlear tectorial membrane, providing a structural route to the characteristic mid-frequency hearing loss.

Cochlear hair cell CL:0000202

COL11A2 hgnc:2187 ⚠ ABNORMAL

Collagen fibril organization GO:0030199

Downstream

Non-Progressive Mid-Frequency Sensorineural Hearing Loss

Sensorineural Hearing Impairment

Show evidence (2 references)

PMID:10581026 SUPPORT Model Organism

"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."

Col11a2 knockout mice demonstrate hearing loss with ultrastructural tectorial membrane disorganization, providing a mechanistic link between collagen XI dysfunction and hearing impairment.

PMID:10581026 SUPPORT Human Clinical

"In both families, deafness is non-progressive and predominantly affects middle frequencies."

Establishes the characteristic mid-frequency hearing loss pattern of DFNA13, consistent with tectorial membrane involvement in frequency-specific cochlear tuning.

COL11A2 Biallelic Disruption of Tectorial Membrane

In DFNB53, biallelic damaging COL11A2 variants impair alpha-2(XI) collagen function. Disruption of type XI collagen in the tectorial membrane is associated with profound hearing loss across all frequencies, although the exact effect of each reported allele on collagen abundance or assembly is not fully resolved.

Cochlear hair cell CL:0000202

COL11A2 hgnc:2187 ⚠ ABNORMAL

Collagen fibril organization GO:0030199

Downstream

Prelingual Profound Sensorineural Hearing Loss

Sensorineural Hearing Impairment

Show evidence (2 references)

PMID:16033917 SUPPORT Human Clinical

"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."

Identifies the molecular location of the first DFNB53 mutation within the collagen triple helix, establishing the pathogenic mechanism.

PMID:25633957 SUPPORT Human Clinical

"The novel p.Ala37Ser is the first missense mutation located in the NC4 domain of the COL11A2 protein."

Identifies a novel functional domain (NC4) affected by DFNB53 mutations, broadening understanding of COL11A2-related hearing loss mechanisms.

Non-Progressive Mid-Frequency Sensorineural Hearing Loss

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.

Show evidence (2 references)

PMID:10581026 SUPPORT Human Clinical

"In both families, deafness is non-progressive and predominantly affects middle frequencies."

Defines the audiometric signature of DFNA13.

PMID:10581026 SUPPORT Human Clinical

"tectorial membrane abnormalities may be one aetiology of sensorineural hearing loss primarily affecting the mid-frequencies."

Links mid-frequency hearing loss to tectorial membrane pathology as a specific audiologic signature.

Prelingual Profound Sensorineural Hearing Loss

DFNB53 causes prelingual, severe-to-profound sensorineural hearing loss affecting all frequencies.

Show evidence (1 reference)

PMID:25633957 SUPPORT Human Clinical

"All homozygous individuals in those families had early onset profound hearing loss across all frequencies without syndromic findings."

Confirms the audiometric severity and prelingual onset in DFNB53 patients.

⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.

●

Phenotypes

1

Sensorineural Hearing Impairment HP:0000407

Show evidence (2 references)

PMID:10581026 SUPPORT Human Clinical

"In both families, deafness is non-progressive and predominantly affects middle frequencies."

Characterizes the DFNA13 hearing loss pattern as sensorineural, non-progressive, and mid-frequency.

PMID:25633957 SUPPORT Human Clinical

"All homozygous individuals in those families had early onset profound hearing loss across all frequencies without syndromic findings."

Confirms sensorineural hearing loss across all frequencies in recessive DFNB53.

🧬

Genetic Associations

1

COL11A2 Mutations (Causative)

Gene: COL11A2 hgnc:2187

Show evidence (2 references)

PMID:16033917 SUPPORT Human Clinical

"This finding suggests that mutation type and location are critical determinants in defining the phenotype of COL11A2 associated diseases."

Establishes the genotype-phenotype correlation principle for COL11A2 mutations.

PMID:25633957 SUPPORT Human Clinical

"Nonsense and frameshift mutations cause the very severe phenotypic effects associated with COL11A2 gene such as OSMED syndrome"

Differentiates the severe syndromic phenotypes (truncating mutations) from the non-syndromic hearing loss (missense mutations).

💊

Medical Actions

3

Hearing Aids

Hearing aids provide access to sound for individuals with aidable COL11A2-related hearing loss; benefit depends on the severity and audiometric pattern.

Show evidence (1 reference)

url:https://www.ncbi.nlm.nih.gov/books/NBK1434/ SUPPORT Other

"Habilitation for hearing loss includes improved access to sound through hearing aids or cochlear implants"

GeneReviews identifies hearing aids as a standard habilitation option for genetic hearing loss.

Cochlear Implantation

Action: cochlear device implantation Ontology label: Surgical Procedure NCIT:C15329

Cochlear implantation can be considered for profound DFNB53 hearing loss when conventional amplification provides inadequate access to sound; COL11A2-specific implant outcome data have not been established.

Show evidence (1 reference)

url:https://www.ncbi.nlm.nih.gov/books/NBK1434/ SUPPORT Other

"Habilitation for hearing loss includes improved access to sound through hearing aids or cochlear implants"

GeneReviews supports cochlear implants for genetic hearing loss generally; this is not COL11A2-specific outcome evidence.

Genetic Counseling

Action: Genetic Counseling NCIT:C15240

Genetic counseling clarifies whether a family's COL11A2-related hearing loss follows dominant or recessive inheritance and supports recurrence-risk and reproductive discussions.

Show evidence (1 reference)

PMID:25633957 SUPPORT Human Clinical

"The identification of the causal mutation is important for early diagnosis, clinical follow-up, and genetic counseling."

The DFNB53 report directly supports genetic counseling after molecular diagnosis.

{ }

Source YAML

click to show

name: COL11A2-Related Hearing Loss
creation_date: '2026-04-04T12:00:00Z'
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 heterozygous variants affecting the triple-helix domain.
  DFNB53 presents with prelingual, profound sensorineural hearing loss across all
  frequencies due to biallelic damaging 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)
  subtype_term:
    preferred_term: autosomal dominant nonsyndromic hearing loss 13
    term:
      id: MONDO:0011159
      label: autosomal dominant nonsyndromic hearing loss 13
  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.
  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: Two families establish the autosomal dominant DFNA13 subtype.
- name: DFNB53
  display_name: DFNB53 (Autosomal Recessive)
  subtype_term:
    preferred_term: autosomal recessive nonsyndromic hearing loss 53
    term:
      id: MONDO:0012333
      label: autosomal recessive nonsyndromic hearing loss 53
  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.
  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: Homozygous affected individuals establish the recessive DFNB53 subtype.
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 disrupt collagen XI function and cause
    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) impair 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: Dominant COL11A2 Disruption of Tectorial Membrane
  biological_scale: MOLECULAR
  description: >
    In DFNA13, heterozygous variants predicted to affect the collagen triple-helix
    domain disrupt COL11A2 function. Model-organism evidence links Col11a2 disruption
    to loss of organized collagen fibrils in the cochlear tectorial membrane, providing
    a structural route to the characteristic mid-frequency hearing loss.
  gene:
    preferred_term: COL11A2
    description: >
      Collagen type XI alpha-2 chain, a component of type XI collagen heterotrimers
      essential for tectorial membrane structure.
    modifier: ABNORMAL
    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
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    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: The DFNA13 families directly establish the characteristic hearing-loss pattern.
  - target: Sensorineural Hearing Impairment
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    evidence:
    - 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: The study connects COL11A2-related tectorial membrane abnormalities to sensorineural hearing loss.
- name: COL11A2 Biallelic Disruption of Tectorial Membrane
  biological_scale: MOLECULAR
  description: >
    In DFNB53, biallelic damaging COL11A2 variants impair alpha-2(XI) collagen
    function. Disruption of type XI collagen in the tectorial membrane is associated
    with profound hearing loss across all frequencies, although the exact effect of
    each reported allele on collagen abundance or assembly is not fully resolved.
  gene:
    preferred_term: COL11A2
    description: >
      Collagen type XI alpha-2 chain; biallelic damaging variants cause DFNB53.
    modifier: ABNORMAL
    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
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    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: The DFNB53 families directly establish early profound hearing loss across all frequencies.
  - target: Sensorineural Hearing Impairment
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    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: A homozygous collagen-domain variant is directly associated with autosomal recessive nonsyndromic hearing loss.
- name: Non-Progressive Mid-Frequency Sensorineural Hearing Loss
  biological_scale: ORGANISM
  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
  biological_scale: ORGANISM
  description: >
    DFNB53 causes prelingual, severe-to-profound sensorineural hearing loss
    affecting all frequencies.
  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: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.
  - 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 sensorineural hearing loss across all frequencies in recessive DFNB53.
treatments:
- name: Hearing Aids
  description: >-
    Hearing aids provide access to sound for individuals with aidable
    COL11A2-related hearing loss; benefit depends on the severity and audiometric
    pattern.
  therapeutic_modality: DEVICE
  treatment_term:
    preferred_term: hearing aid usage
  evidence:
  - reference: url:https://www.ncbi.nlm.nih.gov/books/NBK1434/
    reference_title: "Genetic Hearing Loss Overview - GeneReviews® - NCBI Bookshelf"
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Habilitation for hearing loss includes improved access to sound through hearing aids or cochlear implants"
    explanation: GeneReviews identifies hearing aids as a standard habilitation option for genetic hearing loss.
- name: Cochlear Implantation
  description: >-
    Cochlear implantation can be considered for profound DFNB53 hearing loss
    when conventional amplification provides inadequate access to sound;
    COL11A2-specific implant outcome data have not been established.
  therapeutic_modality: DEVICE
  treatment_term:
    preferred_term: cochlear device implantation
    term:
      id: NCIT:C15329
      label: Surgical Procedure
  evidence:
  - reference: url:https://www.ncbi.nlm.nih.gov/books/NBK1434/
    reference_title: "Genetic Hearing Loss Overview - GeneReviews® - NCBI Bookshelf"
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Habilitation for hearing loss includes improved access to sound through hearing aids or cochlear implants"
    explanation: GeneReviews supports cochlear implants for genetic hearing loss generally; this is not COL11A2-specific outcome evidence.
- name: Genetic Counseling
  description: >-
    Genetic counseling clarifies whether a family's COL11A2-related hearing loss
    follows dominant or recessive inheritance and supports recurrence-risk and
    reproductive discussions.
  treatment_term:
    preferred_term: Genetic Counseling
    term:
      id: NCIT:C15240
      label: Genetic Counseling
  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: "The identification of the causal mutation is important for early diagnosis, clinical follow-up, and genetic counseling."
    explanation: The DFNB53 report directly supports genetic counseling after molecular diagnosis.
references:
- reference: PMID:20301607
  title: Genetic Hearing Loss Overview.
  tags:
  - GeneReviews
discussions:
- discussion_id: dfnb53_carrier_auditory_effects
  prompt: >-
    Do heterozygous DFNB53 variants reproducibly accelerate adult-onset
    sensorineural hearing loss, indicating semi-dominant auditory expression?
  kind: KNOWLEDGE_GAP
  status: OPEN
  attaches_to:
  - inheritance#Autosomal Recessive (DFNB53)
  rationale: >-
    One DFNB53 family showed progressive hearing loss in heterozygous carriers,
    but larger and longitudinal carrier cohorts are needed to distinguish a
    variant effect from ordinary age- and exposure-related hearing loss.
  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: "Interestingly, in family FT3, carriers of the p.Ala37Ser mutation had apparently progressive sensorineural HL after age 30 years."
    explanation: The family provides direct evidence of later-onset hearing loss in heterozygous carriers.
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. The top-level MONDO term
  MONDO:0011159 specifically grounds DFNA13, while this aggregate entry also
  includes the separately grounded DFNB53 subtype (MONDO:0012333;
  OMIM:609706).

📚

References & Deep Research

References

1

PMID:20301607

Genetic Hearing Loss Overview.

No top-level findings curated for this source.

Deep Research

1

Falcon ▸

COL11A2-Related Hearing Loss — Comprehensive Disease Characteristics Report

Edison Scientific Literature 30 citations 2026-04-04T12:50:13.257622

COL11A2-Related Hearing Loss — Comprehensive Disease Characteristics Report

Target disease

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).

1. Disease information

1.1 Definition and current understanding

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).

1.2 Common synonyms / alternative names

DFNA13 (COL11A2-related autosomal dominant nonsyndromic hearing loss) (mcguirt1999mutationsincol11a2 pages 1-2).
DFNB53 (COL11A2-related autosomal recessive nonsyndromic hearing loss) (chen2005mutationofcol11a2 pages 2-5).
Non-ocular Stickler syndrome / Stickler syndrome type 3 (COL11A2-related) (iwasa2015nonocularsticklersyndrome pages 3-4, acke2022hearinglossin pages 4-6).
OSMED (otospondylomegaepiphyseal dysplasia) in the COL11A2 phenotypic spectrum (chen2005mutationofcol11a2 pages 2-5, acke2022hearinglossin pages 4-6).

1.3 Evidence source type

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).

2. Etiology

2.1 Disease causal factors (genetic)

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).

2.2 Variant type and functional consequences (current evidence)

Missense substitutions in the collagen triple-helix domain are implicated in DFNA13 and DFNB53 (mcguirt1999mutationsincol11a2 pages 1-2, chen2005mutationofcol11a2 pages 2-5).
A frameshift variant was reported in a family with AD non-ocular Stickler syndrome and hearing loss (iwasa2015nonocularsticklersyndrome pages 3-4).
In a Col11a2-null mouse model, loss of type XI collagen perturbs TM collagen organization and TM mechanical anisotropy, consistent with a structural/biomechanical mechanism (masaki2009col11a2deletionreveals pages 1-2).

2.3 Risk factors / protective factors / gene–environment interactions

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).

3. Phenotypes

3.1 Core hearing phenotypes (human)

DFNA13 (COL11A2; AD nonsyndromic)

Onset: congenital (mcguirt1999mutationsincol11a2 pages 1-2).
Progression: reported as non-progressive (mcguirt1999mutationsincol11a2 pages 1-2, mcguirt1999mutationsincol11a2 pages 5-6).
Audiogram: predominantly mid-frequency loss with a characteristic “cookie-bite” profile (mcguirt1999mutationsincol11a2 pages 1-2).
Severity: mild to moderately severe in a reported family (mcguirt1999mutationsincol11a2 pages 1-2).
Extra-auditory features: absent in the described nonsyndromic families.
Direct quote: “Specifically, no midface hypoplasia, cleft palate, precocious arthritis, or stature or ocular abnormalities were noted.” (mcguirt1999mutationsincol11a2 pages 1-2).

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)

DFNB53 (COL11A2; AR nonsyndromic)

Onset: prelingual (chen2005mutationofcol11a2 pages 2-5).
Severity: profound sensorineural hearing loss (chen2005mutationofcol11a2 pages 2-5).
Progression: described as non-progressive (chen2005mutationofcol11a2 pages 2-5).
Vestibular: normal on clinical assessment (chen2005mutationofcol11a2 pages 2-5).
Extra-auditory: in the reported family, no ocular/midface/palatal abnormalities or skeletal dysplasia, supporting a nonsyndromic diagnosis (chen2005mutationofcol11a2 pages 2-5).

Suggested HPO terms: - Sensorineural hearing impairment (HP:0000407) - Profound hearing impairment (HP:0000405) - Prelingual onset (HP:0003623)

COL11A2-related non-ocular Stickler syndrome (Stickler type 3)

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)

3.2 Quality of life impact

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).

4. Genetic / molecular information

4.1 Causal gene

COL11A2 (collagen type XI alpha 2 chain) (mcguirt1999mutationsincol11a2 pages 1-2, chen2005mutationofcol11a2 pages 2-5).

4.2 Pathogenic variants and genotype–phenotype correlation (evidence-based)

AD DFNA13 can be caused by heterozygous missense variants and presents as isolated nonsyndromic hearing loss with cookie-bite audiograms (mcguirt1999mutationsincol11a2 pages 1-2, mcguirt1999mutationsincol11a2 pages 4-5).
AR DFNB53 in one consanguineous family was caused by a homozygous missense variant p.Pro621Thr and caused profound prelingual nonsyndromic SNHL without skeletal/ocular findings (chen2005mutationofcol11a2 pages 2-5).
In a COL11A2-related non-ocular Stickler family, massively parallel sequencing enabled detection of a novel variant, supporting broad use of NGS-based testing in heterogeneous hereditary hearing loss (iwasa2015nonocularsticklersyndrome pages 3-4).

4.3 Modifier genes / epigenetics / chromosomal abnormalities

No COL11A2-specific modifier-gene or epigenetic-disease mechanisms were described in the retrieved evidence.

5. Environmental information

5.1 Noise exposure as an ECM perturbagen (relevant to hearing loss biology)

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).

6. Mechanism / pathophysiology

6.1 Mechanistic concept: “cochlear conductive” / ECM-biomechanical hearing loss

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).

6.2 Tectorial membrane (TM) mechanics and COL11A2

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).

6.3 Developmental expression and implicated cochlear cell types

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).

7. Anatomical structures affected

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).

8. Temporal development (natural history)

DFNA13

Congenital onset and non-progressive course were reported in DFNA13 families (mcguirt1999mutationsincol11a2 pages 1-2).

DFNB53

Prelingual onset and non-progressive course were described in DFNB53 family L622 (chen2005mutationofcol11a2 pages 2-5).

COL11A2-related non-ocular Stickler syndrome

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).

9. Inheritance and population

9.1 Inheritance patterns

DFNA13: autosomal dominant (mcguirt1999mutationsincol11a2 pages 1-2).
DFNB53: autosomal recessive (chen2005mutationofcol11a2 pages 2-5).

9.2 Population genetics / epidemiology

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).

10. Diagnostics

10.1 Clinical tests

Pure-tone audiometry used to confirm and characterize hearing loss in DFNB53 and Stickler/non-ocular Stickler (chen2005mutationofcol11a2 pages 2-5, iwasa2015nonocularsticklersyndrome pages 3-4).
Speech discrimination testing and observed benefit from amplification were reported in COL11A2-related non-ocular Stickler (iwasa2015nonocularsticklersyndrome pages 3-4).

10.2 Genetic testing

Massively parallel sequencing (NGS) enabled diagnosis of non-ocular Stickler syndrome in a Japanese hearing-loss cohort/family and facilitated correct clinical classification (e.g., distinguishing from other craniofacial conditions) (iwasa2015nonocularsticklersyndrome pages 3-4).

10.3 Differential diagnosis

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).

11. Outcome / prognosis

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).

12. Treatment

12.1 Current applications and real-world implementations

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).

12.2 Emerging / experimental therapies

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).

13. Prevention

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.

14. Other species / natural disease

No naturally occurring veterinary COL11A2 hearing-loss syndromes were retrieved.

15. Model organisms

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).

Key recent developments (prioritizing 2023–2024 sources)

ECM proteomics in noise injury implicates COL11A2 among hearing-relevant ECM proteins and provides quantitative ABR threshold shifts and pathway enrichment (focal adhesion/ECM receptor interaction) (Shi et al., 2023; Oct 2023; https://doi.org/10.1007/s12033-022-00557-2) (shi2023acutenoisecauses pages 1-4, shi2023acutenoisecauses pages 13-19).
Single-cell/single-nucleus cochlear atlases for targeted therapies provide frameworks to map expression patterns of hereditary deafness genes (not COL11A2-specific in the excerpt) (Jean et al., 2023; Jun 2023; https://doi.org/10.1073/pnas.2221744120) (jean2023singlecelltranscriptomicprofiling pages 6-7).

Expert synthesis / interpretation (grounded in retrieved sources)

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).

Structured summary table

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.

Supporting figure (tectorial membrane anisotropy)

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).

Limitations of this report (evidence gaps in this run)

MONDO/Orphanet/OMIM/ICD/MeSH identifiers were not retrieved via available tools in this run.
Epidemiology (population prevalence/incidence), penetrance/expressivity estimates, carrier frequency (gnomAD), and comprehensive COL11A2 variant catalogs (ClinVar) were not available in the retrieved evidence set.
Clinical management beyond hearing aids (e.g., cochlear implant outcomes) and formal QoL statistics were not retrieved.

References

(mcguirt1999mutationsincol11a2 pages 1-2): Wyman T. McGuirt, Sai D. Prasad, Andrew J. Griffith, Henricus P.M. Kunst, Glenn E. Green, Karl B. Shpargel, Christina Runge, Christy Huybrechts, Robert F. Mueller, Eric Lynch, Mary-Claire King, Han G. Brunner, Cor W.R.J. Cremers, Masamine Takanosu, Shi-Wu Li, Machiko Arita, Richard Mayne, Darwin J. Prockop, Guy Van Camp, and Richard J.H. Smith. Mutations in col11a2 cause non-syndromic hearing loss (dfna13). Nature Genetics, 23:413-419, Dec 1999. URL: https://doi.org/10.1038/70516, doi:10.1038/70516. This article has 347 citations and is from a highest quality peer-reviewed journal.
(chen2005mutationofcol11a2 pages 2-5): Wenjie Chen, K. Kahrizi, N. Meyer, Y. Riazalhosseini, Guy, Van Camp, H. Najmabadi, and R. J. Smith. Mutation of col11a2 causes autosomal recessive non-syndromic hearing loss at the dfnb53 locus. Journal of Medical Genetics, 42:e61-e61, Oct 2005. URL: https://doi.org/10.1136/jmg.2005.032615, doi:10.1136/jmg.2005.032615. This article has 106 citations and is from a domain leading peer-reviewed journal.
(iwasa2015nonocularsticklersyndrome pages 3-4): Yoh-ichiro Iwasa, Hideaki Moteki, Mitsuru Hattori, Ririko Sato, Shin-ya Nishio, Yutaka Takumi, and Shin-ichi Usami. Non-ocular stickler syndrome with a novel mutation in col11a2 diagnosed by massively parallel sequencing in japanese hearing loss patients. Annals of Otology, Rhinology & Laryngology, 124:111S-117S, Mar 2015. URL: https://doi.org/10.1177/0003489415575044, doi:10.1177/0003489415575044. This article has 10 citations.
(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.
(masaki2009col11a2deletionreveals pages 1-2): Kinuko Masaki, Kinuko Masaki, J. Gu, J. Gu, R. Ghaffari, R. Ghaffari, Gary Chan, Richard J. H. Smith, D. M. Freeman, D. M. Freeman, and A. Aranyosi. Col11a2 deletion reveals the molecular basis for tectorial membrane mechanical anisotropy. Biophysical Journal, 96:4717-4724, Jun 2009. URL: https://doi.org/10.1016/j.bpj.2009.02.056, doi:10.1016/j.bpj.2009.02.056. This article has 35 citations and is from a domain leading peer-reviewed journal.
(sellon2019thetectorialmembrane pages 1-3): Jonathan B. Sellon, Roozbeh Ghaffari, and Dennis M. Freeman. The tectorial membrane: mechanical properties and functions. Cold Spring Harbor perspectives in medicine, 9:a033514, Oct 2019. URL: https://doi.org/10.1101/cshperspect.a033514, doi:10.1101/cshperspect.a033514. This article has 34 citations and is from a peer-reviewed journal.
(mcguirt1999mutationsincol11a2 pages 5-6): Wyman T. McGuirt, Sai D. Prasad, Andrew J. Griffith, Henricus P.M. Kunst, Glenn E. Green, Karl B. Shpargel, Christina Runge, Christy Huybrechts, Robert F. Mueller, Eric Lynch, Mary-Claire King, Han G. Brunner, Cor W.R.J. Cremers, Masamine Takanosu, Shi-Wu Li, Machiko Arita, Richard Mayne, Darwin J. Prockop, Guy Van Camp, and Richard J.H. Smith. Mutations in col11a2 cause non-syndromic hearing loss (dfna13). Nature Genetics, 23:413-419, Dec 1999. URL: https://doi.org/10.1038/70516, doi:10.1038/70516. This article has 347 citations and is from a highest quality peer-reviewed journal.
(acke2012hearingimpairmentin pages 10-10): Frederic R E Acke, Ingeborg J M Dhooge, Fransiska Malfait, and Els M R De Leenheer. Hearing impairment in stickler syndrome: a systematic review. Orphanet Journal of Rare Diseases, 7:84-84, Oct 2012. URL: https://doi.org/10.1186/1750-1172-7-84, doi:10.1186/1750-1172-7-84. This article has 127 citations and is from a peer-reviewed journal.
(mcguirt1999mutationsincol11a2 pages 4-5): Wyman T. McGuirt, Sai D. Prasad, Andrew J. Griffith, Henricus P.M. Kunst, Glenn E. Green, Karl B. Shpargel, Christina Runge, Christy Huybrechts, Robert F. Mueller, Eric Lynch, Mary-Claire King, Han G. Brunner, Cor W.R.J. Cremers, Masamine Takanosu, Shi-Wu Li, Machiko Arita, Richard Mayne, Darwin J. Prockop, Guy Van Camp, and Richard J.H. Smith. Mutations in col11a2 cause non-syndromic hearing loss (dfna13). Nature Genetics, 23:413-419, Dec 1999. URL: https://doi.org/10.1038/70516, doi:10.1038/70516. This article has 347 citations and is from a highest quality peer-reviewed journal.
(shi2023acutenoisecauses pages 1-4): Min Shi, Lei Cao, Daxiong Ding, Lei Shi, Yiyong Hu, Guowei Qi, Li Zhan, Yuhua Zhu, Wenxing Yu, Ping Lv, and Ning Yu. Acute noise causes down-regulation of ecm protein expression in guinea pig cochlea. Molecular Biotechnology, 65:774-785, Oct 2023. URL: https://doi.org/10.1007/s12033-022-00557-2, doi:10.1007/s12033-022-00557-2. This article has 5 citations and is from a peer-reviewed journal.
(shi2023acutenoisecauses pages 13-19): Min Shi, Lei Cao, Daxiong Ding, Lei Shi, Yiyong Hu, Guowei Qi, Li Zhan, Yuhua Zhu, Wenxing Yu, Ping Lv, and Ning Yu. Acute noise causes down-regulation of ecm protein expression in guinea pig cochlea. Molecular Biotechnology, 65:774-785, Oct 2023. URL: https://doi.org/10.1007/s12033-022-00557-2, doi:10.1007/s12033-022-00557-2. This article has 5 citations and is from a peer-reviewed journal.
(shi2023acutenoisecauses pages 10-13): Min Shi, Lei Cao, Daxiong Ding, Lei Shi, Yiyong Hu, Guowei Qi, Li Zhan, Yuhua Zhu, Wenxing Yu, Ping Lv, and Ning Yu. Acute noise causes down-regulation of ecm protein expression in guinea pig cochlea. Molecular Biotechnology, 65:774-785, Oct 2023. URL: https://doi.org/10.1007/s12033-022-00557-2, doi:10.1007/s12033-022-00557-2. This article has 5 citations and is from a peer-reviewed journal.
(iwasa2015nonocularsticklersyndrome pages 4-5): Yoh-ichiro Iwasa, Hideaki Moteki, Mitsuru Hattori, Ririko Sato, Shin-ya Nishio, Yutaka Takumi, and Shin-ichi Usami. Non-ocular stickler syndrome with a novel mutation in col11a2 diagnosed by massively parallel sequencing in japanese hearing loss patients. Annals of Otology, Rhinology & Laryngology, 124:111S-117S, Mar 2015. URL: https://doi.org/10.1177/0003489415575044, doi:10.1177/0003489415575044. This article has 10 citations.
(masaki2009col11a2deletionreveals media 7efb6948): Kinuko Masaki, Kinuko Masaki, J. Gu, J. Gu, R. Ghaffari, R. Ghaffari, Gary Chan, Richard J. H. Smith, D. M. Freeman, D. M. Freeman, and A. Aranyosi. Col11a2 deletion reveals the molecular basis for tectorial membrane mechanical anisotropy. Biophysical Journal, 96:4717-4724, Jun 2009. URL: https://doi.org/10.1016/j.bpj.2009.02.056, doi:10.1016/j.bpj.2009.02.056. This article has 35 citations and is from a domain leading peer-reviewed journal.
(shpargel2004col11a1andcol11a2 pages 1-3): Karl B. Shpargel, Tomoko Makishima, and Andrew J. Griffith. Col11a1 and col11a2 mrna expression in the developing mouse cochlea: implications for the correlation of hearing loss phenotype with mutant type xi collagen genotype. Acta Oto-Laryngologica, 124:242-248, Mar 2004. URL: https://doi.org/10.1080/00016480410016162, doi:10.1080/00016480410016162. This article has 46 citations and is from a peer-reviewed journal.
(shpargel2004col11a1andcol11a2 pages 3-4): Karl B. Shpargel, Tomoko Makishima, and Andrew J. Griffith. Col11a1 and col11a2 mrna expression in the developing mouse cochlea: implications for the correlation of hearing loss phenotype with mutant type xi collagen genotype. Acta Oto-Laryngologica, 124:242-248, Mar 2004. URL: https://doi.org/10.1080/00016480410016162, doi:10.1080/00016480410016162. This article has 46 citations and is from a peer-reviewed journal.
(jean2023singlecelltranscriptomicprofiling pages 6-7): Philippe Jean, Fabienne Wong Jun Tai, Amrit Singh-Estivalet, Andrea Lelli, Cyril Scandola, Sébastien Megharba, Sandrine Schmutz, Solène Roux, Sabrina Mechaussier, Muriel Sudres, Enguerran Mouly, Anne-Valérie Heritier, Crystel Bonnet, Adeline Mallet, Sophie Novault, Valentina Libri, Christine Petit, and Nicolas Michalski. Single-cell transcriptomic profiling of the mouse cochlea: an atlas for targeted therapies. Proceedings of the National Academy of Sciences of the United States of America, Jun 2023. URL: https://doi.org/10.1073/pnas.2221744120, doi:10.1073/pnas.2221744120. This article has 65 citations and is from a highest quality peer-reviewed journal.

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OpenScientist Report

Inheritance

Subtypes

Discussions and Knowledge Gaps

Pathophysiology

Pathograph

Phenotypes

Genetic Associations

Medical Actions

Source YAML

References & Deep Research

References

Deep Research

COL11A2-Related Hearing Loss — Comprehensive Disease Characteristics Report

Target disease

1. Disease information

1.1 Definition and current understanding

1.2 Common synonyms / alternative names

1.3 Evidence source type

2. Etiology

2.1 Disease causal factors (genetic)

2.2 Variant type and functional consequences (current evidence)

2.3 Risk factors / protective factors / gene–environment interactions

3. Phenotypes

3.1 Core hearing phenotypes (human)

DFNA13 (COL11A2; AD nonsyndromic)

DFNB53 (COL11A2; AR nonsyndromic)

COL11A2-related non-ocular Stickler syndrome (Stickler type 3)

3.2 Quality of life impact

4. Genetic / molecular information

4.1 Causal gene

4.2 Pathogenic variants and genotype–phenotype correlation (evidence-based)

4.3 Modifier genes / epigenetics / chromosomal abnormalities

5. Environmental information

5.1 Noise exposure as an ECM perturbagen (relevant to hearing loss biology)

6. Mechanism / pathophysiology

6.1 Mechanistic concept: “cochlear conductive” / ECM-biomechanical hearing loss

6.2 Tectorial membrane (TM) mechanics and COL11A2

6.3 Developmental expression and implicated cochlear cell types

7. Anatomical structures affected

8. Temporal development (natural history)

DFNA13

DFNB53

COL11A2-related non-ocular Stickler syndrome

9. Inheritance and population

9.1 Inheritance patterns

9.2 Population genetics / epidemiology

10. Diagnostics

10.1 Clinical tests

10.2 Genetic testing

10.3 Differential diagnosis

11. Outcome / prognosis

12. Treatment

12.1 Current applications and real-world implementations

12.2 Emerging / experimental therapies

13. Prevention

14. Other species / natural disease

15. Model organisms

Key recent developments (prioritizing 2023–2024 sources)

Expert synthesis / interpretation (grounded in retrieved sources)

Structured summary table

Supporting figure (tectorial membrane anisotropy)

Limitations of this report (evidence gaps in this run)