COL18A1 p.Pro891=
c.2673C>T · rs191481067 · VCV1166462
Benign/Likely benign
Multiple submitters
Classification
Benign/Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 3 submitters
gnomAD v4.1
Rare
rare (popmax 0.627%, 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 -20 | GERP -2.1 |
| Overall | ||
| CADD | 0.192 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.627%
African / African-American · 463/73,886 alleles
Filtering AF
0.579%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.561%
Overall
0.0404%
634/1,567,622 alleles · rare
exomes 348/1,415,272 · genomes 286/152,350 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.627% | 160 |
| Finnishnot grpmax-eligible | 0.0689% | 1,452 |
| Remaining individualsnot grpmax-eligible | 0.0626% | 1,598 |
| Admixed American | 0.0524% | 1,907 |
| South Asian | 0.0246% | 4,071 |
| Middle Eastern | 0.0166% | 6,008 |
| East Asian | 0.0142% | 7,025 |
| European (non-Finnish) | 0.00311% | 32,130 |
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
- COL18A1
- Protein
- p.Pro891=
- Coding
- c.2673C>T
- MANE Select
- NM_001379500
- dbSNP
- rs191481067
- Type
- single nucleotide variant
- Location
- chr21:45497651 (GRCh38)
- Gene constraint
- LOEUF 1.001 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 51.77 · 9 PDB
- Residue 891
- the 'nonhelical region 3 (nc3)' region; the 'disordered' region
Similar variants
- COL18A1 p.Pro891Ser Uncertain significance ★★ ⚠ same residue
- COL18A1 p.Pro891Arg Uncertain significance ★ ⚠ same residue
- COL18A1 c.1897-2A>G Likely pathogenic ★★ same type
- COL18A1 c.2157+1G>A Likely pathogenic ★★ same type
- COL18A1 c.2577+1G>A Pathogenic/Likely pathogenic ★★ same type
- COL18A1 c.3013+3A>C Likely pathogenic ★★ same type
- COL18A1 c.3809+2T>C Pathogenic ★★ same type
- COL18A1 c.798+1G>T Likely pathogenic ★★ 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/col18a1-p-pro891 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown