CHRM3 p.Lys556=
c.1668G>A · VCV4751128
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00439%, sas)
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 8.6 | GERP 1.2, phastCons 1 |
| Overall | ||
| CADD | 8.877 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00439%
South Asian · 4/91,090 alleles
Filtering AF
0.00145%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00123%
Overall
0.00192%
31/1,614,020 alleles · very rare
exomes 28/1,461,880 · genomes 3/152,140 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| South Asiangrpmax | 0.00439% | 22,773 |
| Remaining individualsnot grpmax-eligible | 0.0032% | 31,243 |
| European (non-Finnish) | 0.00212% | 47,202 |
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
- CHRM3
- Protein
- p.Lys556=
- Coding
- c.1668G>A
- MANE Select
- NM_001375978
- Type
- single nucleotide variant
- Location
- chr1:239909119 (GRCh38)
- Gene constraint
- LOEUF 0.42 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
- Structure
- AlphaFold pLDDT 67.30 · 5 PDB
- Residue 556
- an α-helix
Similar variants
- CHRM3 p.Ala585Thr Uncertain significance ★★ ⚠ same type
- CHRM3 p.Ala589Asp Uncertain significance ★★ ⚠ same type
- CHRM3 p.Arg310His Uncertain significance ★★ ⚠ same type
- CHRM3 p.Arg44Gln Uncertain significance ★★ ⚠ same type
- CHRM3 p.Arg569Cys Uncertain significance ★★ ⚠ same type
- CHRM3 p.Arg584His Uncertain significance ★★ ⚠ same type
- CHRM3 p.Asn339Lys Uncertain significance ★★ ⚠ same type
- CHRM3 p.Asn444Thr 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/chrm3-p-lys556 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown