GNAS p.Phe620=
c.1860C>T · rs199549396 · VCV2636162
Uncertain significance
Single submitter
Classification
Uncertain significance
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00267%, afr)
Conditions
1
GNAS-related disorder
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| REVEL | 0.03 | moderately benign-leaning |
|---|---|---|
| Splicing | ||
| SpliceAI | — | not assessed · no allele here is in the release |
| Constraint at this position | ||
| Conservation | phyloP 1.2 | GERP -0.94, phastCons 1 |
| Overall | ||
| CADD | 15.15 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00267%
African / African-American · 2/74,954 alleles
Filtering AF
0.000763%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.000605%
Overall
0.00112%
18/1,613,578 alleles · very rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.00267% | 37,477 |
| Admixed American | 0.00167% | 60,002 |
| European (non-Finnish) | 0.00127% | 78,658 |
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
- GNAS
- Protein
- p.Phe620=
- Coding
- c.1860C>T
- MANE Select
- NM_000516 · reported on NM_080425
- dbSNP
- rs199549396
- Type
- single nucleotide variant
- Location
- chr20:58855125 (GRCh38)
- Gene constraint
- LOEUF 0.302 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
- Structure
- AlphaFold pLDDT 59.47 · 200 PDB
Similar variants
- GNAS p.Phe620Leu Uncertain significance ⚠ same residue
- GNAS p.Ala102Val Pathogenic/Likely pathogenic ★★ same condition
- GNAS p.Arg165His Pathogenic/Likely pathogenic ★★ same condition
- GNAS p.Arg201Cys Pathogenic/Likely pathogenic ★★ same condition
- GNAS p.Arg258Gln Pathogenic/Likely pathogenic ★★ same condition
- GNAS p.Arg42His Likely pathogenic ★★ same condition
- GNAS p.Gln12Ter Pathogenic ★★ same condition
- GNAS p.Gln213Ter 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/gnas-p-phe620 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown