Is CDH23 p.Arg76His (c.227G>A) pathogenic?

CDH23 p.Arg76His (c.227G>A) is classified Uncertain significance in CDH23 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2022-01-31). AlphaMissense: likely benign (0.1032); Very rare (popmax 0.004%, afr); Associated with Usher syndrome type 1D.

What condition is associated with CDH23 p.Arg76His (c.227G>A)?

CDH23 p.Arg76His (c.227G>A) is associated with Usher syndrome type 1D, autosomal recessive nonsyndromic hearing loss 12, pituitary adenoma 5, multiple types (ClinVar).

How common is CDH23 p.Arg76His (c.227G>A) in the general population?

CDH23 p.Arg76His (c.227G>A) is very rare (popmax 0.004%, afr) (gnomAD).

What do computational predictors say about CDH23 p.Arg76His (c.227G>A)?

AlphaMissense predicts likely benign (score 0.1032) — an in-silico prediction, not a clinical call.

CDH23 p.Arg76His

c.227G>A · rs373802615 · VCV1308098

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.1032 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.004%, afr)

Missense predictors

0/2 damaging

AlphaMissense, REVEL

Conditions

Usher syndrome type 1D

Computational evidence

Protein change
AlphaMissense	0.1032	likely benign
REVEL	0.17	moderately benign-leaning
⇒ AlphaMissense and REVEL both call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.7, phastCons 1
Regional constraint	o/e 0.96	unconstrained · MANE · 359 kb · p 0.017 · regional, not allelic
Overall
CADD	26.2	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.004% African / African-American · 3/74,916 alleles

Filtering AF 0.0013% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00108%

Overall 0.0018% 29/1,613,840 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.004%	24,972
Remaining individualsnot grpmax-eligible	0.0032%	31,233
European (non-Finnish)	0.00195%	51,300
South Asian	0.0011%	91,090

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: CDH23
Protein: p.Arg76His
Coding: c.227G>A
MANE Select: NM_022124
dbSNP: rs373802615
Type: single nucleotide variant
Location: chr10:71510163 (GRCh38)
Gene constraint: LOEUF 0.685 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Residue 76: the cadherin 1 domain

Full CDH23 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Usher syndrome type 1D — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: autosomal recessive nonsyndromic hearing loss 12 pituitary adenoma 5, multiple types

Similar variants

CDH23 p.Arg76Cys Uncertain significance ★ same residue
CDH23 p.Arg76Ser Uncertain significance ★ ⚠ same residue
CDH23 p.Arg76= Likely benign ★ same residue
CDH23 p.Arg2029Trp Pathogenic ★★★ ⚠ same condition
CDH23 p.Asp127Gly Likely pathogenic ★★★ same condition
CDH23 p.Glu956Lys Pathogenic ★★★ same condition
CDH23 p.Pro240Leu Pathogenic ★★★ same condition
CDH23 c.1515-12G>A Uncertain significance ★★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/cdh23-p-arg76his (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown