GNB3 p.Trp339Ter
c.1017G>A · rs879253773 · VCV242984
Pathogenic
No assertion criteria
Classification
Pathogenic
ClinVar
Review
No assertion criteria ☆☆☆☆
ClinVar · 1 submitter
Consequence
nonsense (stop-gain)
predicted LoF
gnomAD v4.1
Absent
absent from gnomAD v4.1
Conditions
1
congenital stationary night blindness 1H
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Consequence | nonsense (stop-gain) | predicted loss-of-function; NMD-escape possible for C-terminal truncations |
|---|---|---|
| REVEL | 0.249 | benign-leaning |
| Splicing | ||
| SpliceAI | — | not looked up on this page · why |
| Constraint at this position | ||
| Conservation | phyloP 12 | GERP 1.5, phastCons 1 |
| Overall | ||
| CADD | 42.0 | PHRED · no single calibrated threshold — expert panels disagree |
Predicted loss-of-function is descriptive, not an applied PVS1 code.
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
- GNB3
- Protein
- p.Trp339Ter
- Coding
- c.1017G>A
- MANE Select
- NM_031299 · reported on NM_002075
- dbSNP
- rs879253773
- Type
- single nucleotide variant
- Location
- chr12:6846892 (GRCh38)
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/gnb3-p-trp339ter (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown