FMO3 p.Asn347=
c.1041C>T · rs770714703 · VCV2890209
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00401%, afr)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| SpliceAI | <0.2 | no splice effect predicted · four deltas, not one · how we know |
|---|---|---|
| Constraint at this position | ||
| Conservation | phyloP -2.5 | GERP 0.44 |
| Overall | ||
| CADD | 1.309 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00401%
African / African-American · 3/74,906 alleles
Filtering AF
0.00106%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00065%
Overall
0.00124%
20/1,613,852 alleles · very rare
exomes 15/1,461,720 · genomes 5/152,132 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.00401% | 24,969 |
| Admixed American | 0.00167% | 59,966 |
| European (non-Finnish) | 0.00136% | 73,745 |
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
- FMO3
- Protein
- p.Asn347=
- Coding
- c.1041C>T
- MANE Select
- NM_001002294
- dbSNP
- rs770714703
- Type
- single nucleotide variant
- Location
- chr1:171114220 (GRCh38)
- Gene constraint
- LOEUF 1.314 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 95.50
Similar variants
- FMO3 c.484+2T>G Likely pathogenic ★★ same type
- FMO3 c.828-2A>G Likely pathogenic ★★ same type
- FMO3 p.Arg223Gln Likely pathogenic ★★ same type
- FMO3 p.Arg223Trp Likely pathogenic ★★ same type
- FMO3 p.Arg238Gln Pathogenic/Likely pathogenic ★★ same type
- FMO3 p.Arg238Ter Pathogenic/Likely pathogenic ★★ same type
- FMO3 p.Arg492Trp Pathogenic/Likely pathogenic ★★ same type
- FMO3 p.Arg500Ter Pathogenic/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/fmo3-p-asn347 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown