CA4 p.Arg271=
c.813G>A · VCV4805151
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00224%, eas)
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 2.2 | GERP 0.051, phastCons 1 |
| Overall | ||
| CADD | 5.009 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00224%
East Asian · 1/44,688 alleles
Overall
0.000248%
4/1,610,060 alleles · very rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| East Asiangrpmax | 0.00224% | 44,688 |
| African / African-American | 0.00134% | 74,790 |
| South Asian | 0.00111% | 90,486 |
| European (non-Finnish) | 8.49e-05% | 1,178,260 |
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
- CA4
- Protein
- p.Arg271=
- Coding
- c.813G>A
- MANE Select
- NM_000717
- Type
- single nucleotide variant
- Location
- chr17:60159298 (GRCh38)
- Gene constraint
- LOEUF 0.975 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 89.86 · 10 PDB
- Residue 271
- the alpha-carbonic anhydrase domain; an α-helix
Similar variants
- CA4 p.Arg271Ser Uncertain significance ★ ⚠ same residue
- CA4 c.745-9C>G Uncertain significance ★★ same type
- CA4 p.Ala156Val Uncertain significance ★★ ⚠ same type
- CA4 p.Ala308Ser Uncertain significance ★★ ⚠ same type
- CA4 p.Arg279Pro Uncertain significance ★★ ⚠ same type
- CA4 p.Arg50His Uncertain significance ★★ ⚠ same type
- CA4 p.Arg50Ser Uncertain significance ★★ ⚠ same type
- CA4 p.Asp131Asn 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/ca4-p-arg271 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown