OCA2
Chr 15AROCA2 melanosomal transmembrane protein
Also known as: BEY, BEY1, BEY2, BOCA, D15S12, EYCL, EYCL2, EYCL3
The protein functions as an integral membrane transporter that regulates melanosomal pH through chloride transport, enabling optimal tyrosinase activity required for melanin synthesis and pigmentation. Mutations cause oculocutaneous albinism type II and brown oculocutaneous albinism, conditions characterized by reduced melanin production affecting skin, hair, and eye pigmentation from birth. This gene follows autosomal recessive inheritance and is not highly constrained against loss-of-function variation.
Definitive — sufficient evidence for diagnostic panels
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Typical tolerance to LoF variation
Tolerant to missense variation
Predictions shown for reference only — model trained on dominant genes, not applicable to AR conditions.
The Badonyi & Marsh prediction model was trained exclusively on dominant disease genes. Predictions are not reliable for genes with autosomal recessive inheritance and are shown at reduced opacity for reference only.
Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312.
ClinVar Variant Classifications
200 submitted variants in ClinVar
Classification Summary
Curated Variants Distribution
Classified variants from ClinVar · 5 ACMG categories
| Classification | LoF | Missense + Inframe | Non-coding | Synonymous | Total |
|---|---|---|---|---|---|
Pathogenic | 15 | 2 | 29 | 0 | 46 |
Likely Pathogenic | 18 | 8 | 6 | 1 | 33 |
VUS | 1 | 46 | 9 | 1 | 57 |
Likely Benign | 0 | 1 | 31 | 30 | 62 |
Benign | 0 | 0 | 0 | 0 | 0 |
Conflicting | — | 2 | |||
| Total | 34 | 57 | 75 | 32 | 200 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
OCA2 · protein map & ClinVar variants
Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.
3D Protein StructureAlphaFold
External Resources
Links to major genomics databases and tools
Clinical Trials
Active and recruiting trials from ClinicalTrials.gov
No active trials found for this gene.
Search ClinicalTrials.gov →External Resources
Links to major genomics databases and tools