C1S p.Tyr648=
c.1944C>T · rs149101075 · VCV1080702
Likely benign
Multiple submitters
Classification
Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 3 submitters
gnomAD v4.1
Rare
ultra-rare (popmax 0.0493%, mid)
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 -5.9 | GERP -3.6 |
| Overall | ||
| CADD | 0.161 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0493%
Middle Eastern · 3/6,080 alleles
Filtering AF
0.0134%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00716%
Overall
0.00762%
123/1,613,596 alleles · ultra-rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Middle Easterngrpmax | 0.0493% | 2,027 |
| European (non-Finnish) | 0.00907% | 11,026 |
| East Asian | 0.00891% | 11,222 |
| Remaining individualsnot grpmax-eligible | 0.0048% | 20,821 |
| African / African-American | 0.00401% | 24,954 |
| South Asian | 0.0022% | 45,528 |
| Admixed American | 0.00167% | 59,954 |
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
- C1S
- Protein
- p.Tyr648=
- Coding
- c.1944C>T
- MANE Select
- NM_001734
- dbSNP
- rs149101075
- Type
- single nucleotide variant
- Location
- chr12:7070528 (GRCh38)
- Gene constraint
- LOEUF 0.783 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 88.02 · 14 PDB
- Residue 648
- a β-strand; a disulfide bond; the peptidase s1 domain
Similar variants
- C1S p.Arg523Ter Pathogenic ★★ same type
- C1S c.1196-3C>T Uncertain significance ★★ same type
- C1S c.717+5G>A Uncertain significance ★★ same type
- C1S c.717+6T>A Uncertain significance ★★ same type
- C1S p.Ala227Val Uncertain significance ★★ ⚠ same type
- C1S p.Ala231Val Uncertain significance ★★ ⚠ same type
- C1S p.Ala584Val Uncertain significance ★★ ⚠ same type
- C1S p.Ala649Thr 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/c1s-p-tyr648 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown