Is CDH23 p.Ala2770= (c.8310C>T) pathogenic?

CDH23 p.Ala2770= (c.8310C>T) is classified Likely benign in CDH23 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-01-25). Ultra-rare (popmax 0.0121%, sas); Associated with Usher syndrome type 1.

What condition is associated with CDH23 p.Ala2770= (c.8310C>T)?

CDH23 p.Ala2770= (c.8310C>T) is associated with Usher syndrome type 1 (ClinVar).

How common is CDH23 p.Ala2770= (c.8310C>T) in the general population?

CDH23 p.Ala2770= (c.8310C>T) is ultra-rare (popmax 0.0121%, sas) (gnomAD).

How is Usher syndrome inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

CDH23 p.Ala2770=

c.8310C>T · rs749582906 · VCV766334

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0121%, sas)

Conditions

Usher syndrome type 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · C>A here scores Δ0.96 · evaluated, not missing
Constraint at this position
Conservation	phyloP -3.2	GERP -3.5
Overall
CADD	3.981	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0121% South Asian · 11/91,074 alleles

Filtering AF 0.00676% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00522%

Overall 0.00205% 33/1,613,582 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0121%	8,279
Ashkenazi Jewishnot grpmax-eligible	0.00676%	14,798
Remaining individualsnot grpmax-eligible	0.0032%	31,226
Finnishnot grpmax-eligible	0.00156%	63,926
European (non-Finnish)	0.00144%	69,395

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.Ala2770=
Coding: c.8310C>T
MANE Select: NM_022124
dbSNP: rs749582906
Type: single nucleotide variant
Location: chr10:71807517 (GRCh38)
Gene constraint: LOEUF 0.685 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Residue 2770: the cadherin 26 domain

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

Disease context

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

For Usher syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy, Neonatal
Prevalence: 1-9 / 100 000 (Worldwide)

Similar variants

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
CDH23 p.Arg301Gln Uncertain significance ★★★ same condition
CDH23 p.Arg3189Gln Uncertain significance ★★★ ⚠ same condition
CDH23 p.Arg3189Trp 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-ala2770 (accessed [today's date]).

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