CSPP1 p.Arg258Lys
c.773G>A · rs199901120 · VCV841703
Uncertain significance
Multiple submitters
Classification
Uncertain significance
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 5 submitters
gnomAD v4.1
Rare
ultra-rare (popmax 0.0493%, mid)
Conditions
3
Inborn genetic diseases
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| REVEL | 0.274 | benign-leaning |
|---|---|---|
| Splicing | ||
| SpliceAI | — | not assessed · no allele here is in the release |
| Constraint at this position | ||
| Conservation | phyloP 5.7 | GERP -0.061, phastCons 1 |
| Regional constraint | o/e 0.96 | unconstrained · MANE · 121 kb · p 0.15 · regional, not allelic |
| Overall | ||
| CADD | 22.3 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0493%
Middle Eastern · 3/6,082 alleles
Filtering AF
0.0243%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.0234%
Overall
0.0219%
353/1,613,878 alleles · ultra-rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Middle Easterngrpmax | 0.0493% | 2,027 |
| Admixed American | 0.0333% | 2,999 |
| European (non-Finnish) | 0.0268% | 3,734 |
| Remaining individualsnot grpmax-eligible | 0.016% | 6,248 |
| Ashkenazi Jewishnot grpmax-eligible | 0.00338% | 29,604 |
| African / African-American | 0.00267% | 37,450 |
| East Asian | 0.00223% | 44,868 |
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
- CSPP1
- Protein
- p.Arg258Lys
- Coding
- c.773G>A
- MANE Select
- NM_001382391
- dbSNP
- rs199901120
- Type
- single nucleotide variant
- Location
- chr8:67095582 (GRCh38)
- Gene constraint
- LOEUF 0.876 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
- Structure
- AlphaFold pLDDT 57.34
Similar variants
- CSPP1 p.Arg258= Likely benign ★ same residue
- CSPP1 c.1022+1G>T Likely pathogenic ★★ same condition
- CSPP1 c.1187+1G>A Pathogenic/Likely pathogenic ★★ same condition
- CSPP1 c.1497-2A>C Likely pathogenic ★★ same condition
- CSPP1 c.1697+1G>T Pathogenic/Likely pathogenic ★★ same condition
- CSPP1 c.2968+1G>A Pathogenic ★★ same condition
- CSPP1 c.2968+1G>T Pathogenic ★★ same condition
- CSPP1 c.923+1G>C 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/cspp1-p-arg258lys (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown