Is CRB1 p.Arg181= (c.543A>G) pathogenic?

CRB1 p.Arg181= (c.543A>G) is classified Likely benign in CRB1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-12-21). Absent from gnomAD v4.1; Associated with retinitis pigmentosa 12.

What condition is associated with CRB1 p.Arg181= (c.543A>G)?

CRB1 p.Arg181= (c.543A>G) is associated with retinitis pigmentosa 12, Leber congenital amaurosis 8 (ClinVar).

How common is CRB1 p.Arg181= (c.543A>G) in the general population?

CRB1 p.Arg181= (c.543A>G) is absent from gnomAD v4.1 (gnomAD).

How is Retinitis pigmentosa inherited?

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

CRB1 p.Arg181=

c.543A>G · rs1405034397 · VCV1652331

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

retinitis pigmentosa 12

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.89	GERP -3.2, phastCons 0.64
Overall
CADD	9.407	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CRB1
Protein: p.Arg181=
Coding: c.543A>G
MANE Select: NM_201253
dbSNP: rs1405034397
Type: single nucleotide variant
Location: chr1:197328894 (GRCh38)
Gene constraint: LOEUF 0.776 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 75.19 · 1 PDB
Residue 181: a disulfide bond; the egf-like 4; calcium-binding domain

Full CRB1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

retinitis pigmentosa 12 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Leber congenital amaurosis 8

For Retinitis pigmentosa (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, Mitochondrial inheritance
Onset: Adolescent, Adult, Childhood
Prevalence: 1-5 / 10 000 (Europe)

Similar variants

CRB1 c.1172-2A>G Likely pathogenic ★★ same condition
CRB1 c.2128+1G>C Pathogenic/Likely pathogenic ★★ same condition
CRB1 c.2129-1G>A Pathogenic/Likely pathogenic ★★ same condition
CRB1 c.2129-1G>C Pathogenic ★★ same condition
CRB1 c.2129-2A>G Pathogenic ★★ same condition
CRB1 c.2676+1G>A Likely pathogenic ★★ same condition
CRB1 c.2842+5G>A Pathogenic/Likely pathogenic ★★ same condition
CRB1 c.2843-1G>T Likely pathogenic ★★ 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/crb1-p-arg181 (accessed [today's date]).

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