Is CRYBB2 p.Arg145Pro (c.434G>C) pathogenic?

CRYBB2 p.Arg145Pro (c.434G>C) is classified Uncertain significance in CRYBB2 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-12-22). AlphaMissense: likely pathogenic (0.9906); Very rare (popmax 8.47e-05%, nfe); Associated with cataract 3 multiple types.

What condition is associated with CRYBB2 p.Arg145Pro (c.434G>C)?

CRYBB2 p.Arg145Pro (c.434G>C) is associated with cataract 3 multiple types (ClinVar).

How common is CRYBB2 p.Arg145Pro (c.434G>C) in the general population?

CRYBB2 p.Arg145Pro (c.434G>C) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

What do computational predictors say about CRYBB2 p.Arg145Pro (c.434G>C)?

AlphaMissense predicts likely pathogenic (score 0.9906) — an in-silico prediction, not a clinical call.

CRYBB2 p.Arg145Pro

c.434G>C · rs776010780 · VCV2823220

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9906 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

cataract 3 multiple types

Computational evidence

Protein change
AlphaMissense	0.9906	likely pathogenic · top 6% in CRYBB2
REVEL	0.855	moderately pathogenic-leaning
SaProt	LLR -13.49	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 9.8	GERP 1.7, phastCons 1
Regional constraint	o/e 0.74	unconstrained · MANE · 10 kb · p 1.7e-05 · regional, not allelic
Overall
CADD	32.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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 8.47e-05% European (non-Finnish) · 1/1,180,048 alleles

Overall 6.19e-05% 1/1,614,258 alleles · very rare exomes 1/1,461,884 · genomes 0/152,374 · joint denominator

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: CRYBB2
Protein: p.Arg145Pro
Coding: c.434G>C
MANE Select: NM_000496
dbSNP: rs776010780
Type: single nucleotide variant
Location: chr22:25229563 (GRCh38)
Gene constraint: LOEUF 0.765 · pLI 0.09 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 89.05 · 3 PDB
Residue 145: a β-strand; the beta/gamma crystallin 'greek key' 3 domain

Full CRYBB2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

cataract 3 multiple types — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CRYBB2 p.Arg145Trp Uncertain significance ★ ⚠ same residue
CRYBB2 p.Arg188Cys Pathogenic/Likely pathogenic ★★ same condition
CRYBB2 p.Arg188His Pathogenic ★★ same condition
CRYBB2 p.Gln155Ter Pathogenic/Likely pathogenic ★★ same condition
CRYBB2 p.Gly119Arg Pathogenic/Likely pathogenic ★★ same condition
CRYBB2 p.Arg160Pro Uncertain significance ★★ ⚠ same condition
CRYBB2 p.Gly57Glu Uncertain significance ★★ ⚠ same condition
CRYBB2 p.Gly61Ser 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/crybb2-p-arg145pro (accessed [today's date]).

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