Is CRYBB3 p.Arg205Trp (c.613C>T) pathogenic?

CRYBB3 p.Arg205Trp (c.613C>T) is classified Uncertain significance in CRYBB3 (ClinVar, Single submitter, 1 submitter; last evaluated 2018-01-13). AlphaMissense: likely benign (0.1838); Very rare (popmax 0.0022%, sas); Associated with cataract 22 multiple types.

What condition is associated with CRYBB3 p.Arg205Trp (c.613C>T)?

CRYBB3 p.Arg205Trp (c.613C>T) is associated with cataract 22 multiple types (ClinVar).

How common is CRYBB3 p.Arg205Trp (c.613C>T) in the general population?

CRYBB3 p.Arg205Trp (c.613C>T) is very rare (popmax 0.0022%, sas) (gnomAD).

How is Early onset non-syndromic cataract inherited?

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

What do computational predictors say about CRYBB3 p.Arg205Trp (c.613C>T)?

AlphaMissense predicts likely benign (score 0.1838) — an in-silico prediction, not a clinical call.

CRYBB3 p.Arg205Trp

c.613C>T · rs752618205 · VCV902501

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1838 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0022%, sas)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

cataract 22 multiple types

Computational evidence

Protein change
AlphaMissense	0.1838	likely benign
REVEL	0.535	indeterminate
SaProt	LLR -7.65	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.49	GERP -3.3
Regional constraint	o/e 1.00	unconstrained · MANE · 5,812 bp · p 0.93 · regional, not allelic
Overall
CADD	24.0	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 0.0022% South Asian · 2/91,034 alleles

Filtering AF 0.00145% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00123%

Overall 0.00205% 30/1,460,856 alleles · very rare

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0032%	31,239
South Asiangrpmax	0.0022%	45,517
European (non-Finnish)	0.00212%	47,189
Admixed American	0.00167%	60,004

Remaining individuals shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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.Arg205Trp
Coding: c.613C>T
MANE Select: NM_004076
dbSNP: rs752618205
Type: single nucleotide variant
Location: chr22:25207189 (GRCh38)
Gene constraint: LOEUF 1.588 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 87.52 · 1 PDB
Residue 205: the 'c-terminal arm' region

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

Disease context

cataract 22 multiple types — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Early onset non-syndromic cataract (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, X-linked recessive
Onset: Infancy, Neonatal

Similar variants

CRYBB3 p.Arg205Gln 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.Arg169Cys Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Arg179His Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Arg207His Uncertain significance ★★ ⚠ same condition
CRYBB3 p.Arg75Cys 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-arg205trp (accessed [today's date]).

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