C8B p.Tyr227=
c.681C>T · rs138606922 · VCV1601317
Benign/Likely benign
Multiple submitters
Classification
Benign/Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 5 submitters
gnomAD v4.1
Rare
rare (popmax 0.307%, afr)
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 -0.18 | GERP -3.9, phastCons 0.004 |
| Overall | ||
| CADD | 3.686 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.307%
African / African-American · 230/74,970 alleles
Filtering AF
0.274%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.262%
Overall
0.0231%
373/1,612,136 alleles · rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.307% | 326 |
| Admixed American | 0.045% | 2,222 |
| Middle Eastern | 0.033% | 3,031 |
| Remaining individualsnot grpmax-eligible | 0.0304% | 3,287 |
| European (non-Finnish) | 0.00755% | 13,244 |
| South Asian | 0.00659% | 15,168 |
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
- C8B
- Protein
- p.Tyr227=
- Coding
- c.681C>T
- MANE Select
- NM_000066
- dbSNP
- rs138606922
- Type
- single nucleotide variant
- Location
- chr1:56949738 (GRCh38)
- Gene constraint
- LOEUF 1.18 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 81.99 · 8 PDB
- Residue 227
- a UniProt-annotated variant site (in c8d2); the macpf domain
Similar variants
- C8B p.Arg284Ter Pathogenic ★★ same type
- C8B p.Arg428Ter Pathogenic ★★ same type
- C8B p.Cys508Ter Pathogenic/Likely pathogenic ★★ same type
- C8B p.Gln91Ter Pathogenic/Likely pathogenic ★★ same type
- C8B p.Trp9Ter Pathogenic ★★ same type
- C8B p.Ala21Thr Uncertain significance ★★ ⚠ same type
- C8B p.Ala446Val Uncertain significance ★★ ⚠ same type
- C8B p.Ala461Ser 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/c8b-p-tyr227 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown