FCSK p.Ser255=
c.765C>T · rs374742425 · VCV2422006
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
ultra-rare (popmax 0.028%, afr)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| SpliceAI | <0.2 | no splice effect predicted · four deltas, not one · how we know |
|---|---|---|
| Constraint at this position | ||
| Conservation | phyloP -20 | GERP -3.1 |
| Overall | ||
| CADD | 0.117 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.028%
African / African-American · 21/75,046 alleles
Filtering AF
0.0187%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.0157%
Overall
0.00328%
53/1,613,536 alleles · ultra-rare
exomes 38/1,461,264 · genomes 15/152,272 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.028% | 3,574 |
| East Asian | 0.00669% | 14,956 |
| Remaining individualsnot grpmax-eligible | 0.0032% | 31,250 |
| South Asian | 0.0022% | 45,538 |
| European (non-Finnish) | 0.00212% | 47,201 |
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
- FCSK
- Protein
- p.Ser255=
- Coding
- c.765C>T
- MANE Select
- NM_145059
- dbSNP
- rs374742425
- Type
- single nucleotide variant
- Location
- chr16:70468950 (GRCh38)
- Gene constraint
- LOEUF 1.254 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 92.20
Similar variants
- FCSK c.412-2A>G Likely pathogenic ★★ same type
- FCSK c.485-2A>G Uncertain significance ★★ same type
- FCSK p.Ala297Val Uncertain significance ★★ ⚠ same type
- FCSK p.Ala348Ser Uncertain significance ★★ ⚠ same type
- FCSK p.Ala481Thr Uncertain significance ★★ ⚠ same type
- FCSK p.Ala488Thr Uncertain significance ★★ same type
- FCSK p.Ala518Val Uncertain significance ★★ ⚠ same type
- FCSK p.Ala554Val 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/fcsk-p-ser255 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown