C8A p.Asn277=
c.831C>T · rs142473572 · VCV1534247
Likely benign
Multiple submitters
Classification
Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 2 submitters
gnomAD v4.1
Rare
ultra-rare (popmax 0.0848%, eas)
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 -3.8 | GERP -4.6 |
| Overall | ||
| CADD | 0.976 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0848%
East Asian · 38/44,834 alleles
Filtering AF
0.0634%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.056%
Overall
0.00645%
104/1,613,404 alleles · ultra-rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| East Asiangrpmax | 0.0848% | 1,180 |
| Admixed American | 0.0184% | 5,448 |
| South Asian | 0.0154% | 6,506 |
| Ashkenazi Jewishnot grpmax-eligible | 0.00338% | 29,590 |
| European (non-Finnish) | 0.00305% | 32,769 |
| African / African-American | 0.00267% | 37,435 |
| Remaining individualsnot grpmax-eligible | 0.0016% | 62,452 |
| Finnishnot grpmax-eligible | 0.00156% | 63,966 |
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
- C8A
- Protein
- p.Asn277=
- Coding
- c.831C>T
- MANE Select
- NM_000562
- dbSNP
- rs142473572
- Type
- single nucleotide variant
- Location
- chr1:56883657 (GRCh38)
- Gene constraint
- LOEUF 1.168 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 79.58 · 11 PDB
- Residue 277
- an α-helix; the macpf domain
Similar variants
- C8A p.Arg424Ter Pathogenic ★★ same type
- C8A p.Arg498Ter Pathogenic/Likely pathogenic ★★ same type
- C8A p.Glu466Ter Pathogenic ★★ same type
- C8A p.Tyr210Ter Pathogenic/Likely pathogenic ★★ same type
- C8A p.Tyr384Ter Pathogenic/Likely pathogenic ★★ same type
- C8A p.Arg107Cys Uncertain significance ★★ ⚠ same type
- C8A p.Arg196His Uncertain significance ★★ ⚠ same type
- C8A p.Arg207Gln Uncertain significance ★★ ⚠ same type
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/c8a-p-asn277 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown