COMP c.2227+18G>A
Benign/Likely benign
Multiple submitters
Classification
Benign/Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 2 submitters
gnomAD v4.1
Rare
rare (popmax 0.172%, afr)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| Splice region | donor +18 | near-intronic (+18 nt from the splice site) |
|---|---|---|
| SpliceAI | — | not assessed · no allele here is in the release |
| Constraint at this position | ||
| Conservation | phyloP -3.8 | GERP -3.3 |
| Non-coding constraint | Z 1.81 | 1 kb window · o/e 0.84 · regional · uncalibrated |
| Overall | ||
| CADD | 0.024 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.172%
African / African-American · 129/75,064 alleles
Filtering AF
0.148%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.139%
Overall
0.00955%
154/1,612,050 alleles · rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.172% | 582 |
| Remaining individualsnot grpmax-eligible | 0.0128% | 7,812 |
| Admixed American | 0.00666% | 15,008 |
| South Asian | 0.0011% | 91,076 |
| European (non-Finnish) | 0.00102% | 98,333 |
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
- COMP
- Coding
- c.2227+18G>A
- MANE Select
- NM_000095
- dbSNP
- rs371523847
- Type
- single nucleotide variant
- Location
- chr19:18783036 (GRCh38)
- Gene constraint
- LOEUF 1.073 · pLI <0.01 · ClinGen HI 0/3 (gnomAD)
- Structure
- AlphaFold pLDDT 88.60 · 1 PDB
Similar variants
- COMP p.Arg718Trp Pathogenic/Likely pathogenic ★★ ⚠ same type
- COMP p.Asn489Lys Pathogenic/Likely pathogenic ★★ same type
- COMP p.Asn523Lys Pathogenic/Likely pathogenic ★★ same type
- COMP p.Asn555Lys Pathogenic/Likely pathogenic ★★ same type
- COMP p.Asp269Gly Pathogenic/Likely pathogenic ★★ same type
- COMP p.Asp273Val Likely pathogenic ★★ same type
- COMP p.Asp326Asn Pathogenic/Likely pathogenic ★★ same type
- COMP p.Asp349His 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/comp-c-2227-plus-18g-a (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown