# NM_016366.3(CABP2):c.470T>C (p.Leu157Pro)

https://sugi.bio/variant/cabp2-p-leu157pro

## Summary

**CABP2 p.Leu157Pro (c.470T>C)** is classified **Uncertain significance** in CABP2 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-04-12). AlphaMissense: likely pathogenic (0.9951); Very rare (popmax 0.0022%, sas); Associated with hearing loss disorder.

**At a glance:** Uncertain significance · review: Single submitter · rsID rs1349245853 · 1 submitter · 1 linked condition · AlphaMissense likely pathogenic · very rare (popmax 0.0022%, sas)

## For patients & families {#patients}

This is a change in the CABP2 gene that is currently of uncertain significance — a definitive interpretation has not yet been established, submitted by 1 submitter, and is linked to hearing loss disorder.

*Reference information, not medical advice, and not a prediction for any individual. A genetic counselor or clinician can interpret what it means for you and your family.*

|  |  |
| --- | --- |
| Clinical trials | 617 registered for this condition — see ClinicalTrials.gov |

**Support & next steps:** [Find a genetic counselor (NSGC)](https://findageneticcounselor.nsgc.org/).

## Identity {#identity}

| Field | Value |
| --- | --- |
| Gene | [CABP2](https://sugi.bio/atlas/gene/CABP2/) |
| Protein change (HGVS p.) | p.Leu157Pro |
| Coding change (HGVS c.) | c.470T>C |
| MANE Select transcript | [NM_016366](https://www.ncbi.nlm.nih.gov/nuccore/NM_016366) |
| dbSNP | [rs1349245853](https://www.ncbi.nlm.nih.gov/snp/rs1349245853/) |
| Variant type | single nucleotide variant |
| Location | chr11:67520070-67520070 (GRCh38) |
| ClinVar | [VCV1065012](https://www.ncbi.nlm.nih.gov/clinvar/variation/1065012/) |

**All HGVS expressions:** `NC_000011.10:g.67520070A>G`, `NC_000011.9:g.67287541A>G`, `NG_032982.1:g.8359T>C`, `NM_001318496.2:c.488T>C`, `NM_016366.3:c.470T>C`

## Computational & population evidence {#evidence}

**Concordance:** ClinVar classifies this **uncertain**; the computational predictors unanimously lean **damaging** — a triage signal, not a reclassification.

- AlphaMissense **likely pathogenic** (0.9951)
- REVEL 0.896 (moderately pathogenic-leaning) — agrees with AlphaMissense
- SaProt LLR -15.832 (damaging) — agrees with AlphaMissense
- → **In-silico consensus:** AlphaMissense, REVEL and SaProt all call this damaging
- Conservation: phyloP 11.053, GERP 1.93, phastCons 1 — highly conserved (agrees)
- AlphaMissense ranks this among the **top 1%** most-pathogenic-predicted substitutions in CABP2 (of 1,288 modeled).
- CADD: **PHRED 31.0**. No single ClinGen-calibrated threshold exists and the expert panels that use CADD disagree — GUCY2D/AIPL1 require ≥ 20.0 for an untranslated-region variant, ABCA4 ≥ 28.1 for a synonymous or indel variant, the Pulmonary Hypertension panel imports Pejaver 2022's missense-calibrated numbers, and the Antibody Deficiencies panel declines CADD entirely for PIK3CD. CADD v1.7 also incorporates Zoonomia phyloP, so it partly re-expresses the conservation above. *Descriptive; no threshold applied.*
- Regional missense constraint: **o/e 0.99** across the covering region of the MANE Select transcript (67,519,142–67,523,326), spanning 4,184 bp. Chi-square p 0.9. Describes the region, not this allele; gnomAD v4.1.1's own constrained determination. *Descriptive; no ACMG code applied.*
- SpliceAI: **not assessed** — no allele at this position is in our SpliceAI release, either because it lies outside the scored MANE transcript scope or because every allele is below Δ0.2. We cannot tell which, so this claims neither; absence is not evidence against a splicing effect.
- Population frequency (gnomAD v4.1): grpmax **0.0022%** (sas) · FAF95 0.000365% · FAF99 0.000137% · 2/91,084 in the highest group · 6/1,613,028 alleles overall — very rare (popmax 0.0022%, sas).

| Ancestry group | Allele frequency | 1 in |
| --- | --- | --- |
| South Asian (grpmax) | 0.0022% | 45,542 |
| European (non-Finnish) | 0.000339% | 294,961 |

*Computational predictors are not independent (ClinGen Variant Classification guidance): AlphaMissense (Cheng et al. 2023) carries the ACMG weight for missense and conservation (phyloP/GERP/phastCons) for non-missense; REVEL (Pejaver-2022 calibrated strength bands) and SaProt (Su et al. 2023, structure-aware, ClinVar-independent protein language model, raw LLR) are shown as orthogonal agreement signals, not additive. For frequency, the gnomAD v4.1 grpmax filtering allele frequency (FAF95) is ClinGen's designated BA1/BS1 input (gnomAD v4 guidance v3.0, June 2025); BA1/BS1 thresholds are disease-specific, not a blanket 5%. Predictions, not a clinical determination.*

## Gene constraint & dosage {#gene-context}

**CABP2** population constraint: LOEUF 1.299, pLI 1.0077e-08, missense-Z -0.18317; ClinGen dosage — haploinsufficiency 30, triplosensitivity 0 (0–3 scale). *Lower LOEUF and higher pLI indicate a gene that tolerates loss-of-function poorly; ClinGen dosage is the curated haploinsufficiency call.*

Curated gene–disease validity (ClinGen):

- **nonsyndromic genetic hearing loss** — Definitive (AR)

## Protein context {#protein}

Residue **157** lies in a UniProt-annotated variant site (in dfnb93); the ef-hand 3 domain.

AlphaFold model confidence (whole protein): pLDDT 68.93, 13% of residues very-high.

## What this gene does {#gene-function}

*Describes the biological roles of CABP2 (the gene this variant disrupts) — not effects measured for this specific variant. A damaging variant is expected to affect these functions and pathways; the degree depends on the variant.*


### Pathways affected {#pathways}

CABP2 participates in **1 Reactome pathway** (⚕ = disease pathway):

| Pathway (Reactome) | Evidence |
| --- | --- |
| [Sensory processing of sound by inner hair cells of the cochlea](https://reactome.org/content/detail/R-HSA-9662360) | other |

## Clinical significance {#significance}

**Uncertain significance** — review status Single submitter *(criteria provided, single submitter)*, last evaluated 2021-04-12.

**Submitter consensus:** unanimous (1/1 Uncertain significance).

### Submitter classifications {#submitters}

| Submitter | Classification | Review | Method | Date |
| --- | --- | --- | --- | --- |
| Department of Otolaryngology – Head & Neck Surgery, Cochlear Implant Center | Uncertain significance | criteria provided, single submitter | clinical testing | 2021-04-12 |

## Associated conditions {#conditions}

[hearing loss disorder](https://sugi.bio/atlas/disease/hearing-loss-disorder/).

**Reported phenotype names (ClinVar):** Hearing impairment, Impaired Hearing.

## Similar variants {#similar}

Related CABP2 variant pages (same residue, condition, or type): [CABP2 c.637+1G>T](/variant/cabp2-c-637-plus-1g-t), [CABP2 p.Ala183Thr](/variant/cabp2-p-ala183thr), [CABP2 p.Arg101Gln](/variant/cabp2-p-arg101gln), [CABP2 p.Arg108Gln](/variant/cabp2-p-arg108gln), [CABP2 p.Arg11Gln](/variant/cabp2-p-arg11gln), [CABP2 p.Arg216Gln](/variant/cabp2-p-arg216gln), [CABP2 p.Arg220Gln](/variant/cabp2-p-arg220gln), [CABP2 p.Arg73Gln](/variant/cabp2-p-arg73gln).

### Data sources & attribution {#sources}

ClinVar (NCBI — public domain, built 2026-10-11); gnomAD v4.1 (Broad Institute, built 2026-10-06); AlphaMissense (Cheng et al. 2023, © Google DeepMind — CC BY 4.0, built 2026-01-27); REVEL (Ioannidis et al. 2016 — ODbL, built 2026-07-13); SaProt (Su et al. 2023 — MIT, built 2026-07-14); SpliceAI (Illumina — free for non-commercial use, built 2026-10-13); CADD (Rentzsch et al. 2019, University of Washington — free for non-commercial use, built 2026-10-10); Conservation (phyloP/phastCons/GERP) (UCSC hg38 470-way mammal (Hiller Lab) + Ensembl Compara, built 2026-07-12); gnomAD Non-coding Constraint (Gnocchi) (Chen et al. 2024, Broad Institute — CC0, built 2026-10-11); gnomAD Regional Missense Constraint (Broad Institute — CC0, built 2026-10-13); Pangolin (Zeng & Li 2022 — CC BY 4.0, built 2026-10-11); Repeat regions (UCSC — RepeatMasker, TRF, segmental duplications, built 2026-10-11); ClinGen (ClinGen, built 2026-09-22); UniProt (CC BY 4.0); Reactome / GO (CC BY 4.0, built 2026-09-23); MaveDB (per-record license, built 2026-10-11); CIViC (CC0, built 2026-09-22); Orphanet (Orphanet, built 2026-06-12)

*Primary record: NCBI ClinVar (variation 1065012). Classifications reflect these databases as of the page's build date and may change. Free reference use — not medical advice; consult the primary submitters and a clinician.*