Is CRYBB3 p.Arg88Cys (c.262C>T) pathogenic?

CRYBB3 p.Arg88Cys (c.262C>T) is classified Uncertain significance in CRYBB3 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-10-14). AlphaMissense: likely benign (0.2935); Very rare (popmax 0.00267%, afr); Associated with Inborn genetic diseases.

What condition is associated with CRYBB3 p.Arg88Cys (c.262C>T)?

CRYBB3 p.Arg88Cys (c.262C>T) is associated with Inborn genetic diseases (ClinVar).

How common is CRYBB3 p.Arg88Cys (c.262C>T) in the general population?

CRYBB3 p.Arg88Cys (c.262C>T) is very rare (popmax 0.00267%, afr) (gnomAD).

What do computational predictors say about CRYBB3 p.Arg88Cys (c.262C>T)?

AlphaMissense predicts likely benign (score 0.2935) — an in-silico prediction, not a clinical call.

CRYBB3 p.Arg88Cys

c.262C>T · VCV4616606

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2935 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00267%, afr)

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.2935	likely benign
REVEL	0.72	pathogenic-leaning
SaProt	LLR -11.99	damaging
⇒ REVEL and SaProt call this damaging; AlphaMissense does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.6	GERP 1.7, phastCons 0.99
Regional constraint	o/e 1.00	unconstrained · MANE · 5,812 bp · p 0.93 · regional, not allelic
Overall
CADD	29.5	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00267% African / African-American · 2/74,930 alleles

Filtering AF 0.000542% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000428%

Overall 0.00105% 17/1,614,084 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00267%	37,465
Admixed American	0.00167%	60,012
Remaining individualsnot grpmax-eligible	0.0016%	62,490
Finnishnot grpmax-eligible	0.00156%	64,046
European (non-Finnish)	0.00102%	98,335

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: CRYBB3
Protein: p.Arg88Cys
Coding: c.262C>T
MANE Select: NM_004076
Type: single nucleotide variant
Location: chr22:25203830 (GRCh38)
Gene constraint: LOEUF 1.588 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 87.52 · 1 PDB
Residue 88: the beta/gamma crystallin 'greek key' 2 domain

Full CRYBB3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CRYBB3 p.Arg88His Uncertain significance ★ ⚠ same residue
CRYBB3 p.Arg127Cys Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Arg127His Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Arg152Cys Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Arg196His Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Arg75Cys Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Arg75Leu Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Asp110Gly 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/crybb3-p-arg88cys (accessed [today's date]).

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