IMPG2 p.Val478=
c.1434T>C · rs199989078 · VCV1130618
Likely benign
Multiple submitters
Classification
Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 2 submitters
gnomAD v4.1
Rare
ultra-rare (popmax 0.033%, mid)
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 0.6 | GERP -4.2, phastCons 0.002 |
| Overall | ||
| CADD | 5.084 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.033%
Middle Eastern · 2/6,062 alleles
Filtering AF
0.0127%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.0101%
Overall
0.00266%
43/1,614,190 alleles · ultra-rare
exomes 39/1,461,864 · genomes 4/152,326 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Middle Easterngrpmax | 0.033% | 3,031 |
| Admixed American | 0.0217% | 4,616 |
| Remaining individualsnot grpmax-eligible | 0.0032% | 31,255 |
| European (non-Finnish) | 0.0022% | 45,385 |
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
- IMPG2
- Protein
- p.Val478=
- Coding
- c.1434T>C
- MANE Select
- NM_016247
- dbSNP
- rs199989078
- Type
- single nucleotide variant
- Location
- chr3:101245911 (GRCh38)
- Gene constraint
- LOEUF 0.773 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 54.28
- Residue 478
- a UniProt-annotated variant site (in rp56); a UniProt-annotated variant site (in vmd5)
Similar variants
- IMPG2 c.1240-1G>A Likely pathogenic ★★ same type
- IMPG2 c.1240-2A>G Pathogenic/Likely pathogenic ★★ same type
- IMPG2 c.502-2A>G Likely pathogenic ★★ same type
- IMPG2 c.583+1G>C Pathogenic/Likely pathogenic ★★ same type
- IMPG2 c.667-1G>A Pathogenic/Likely pathogenic ★★ same type
- IMPG2 c.828+1G>A Pathogenic/Likely pathogenic ★★ same type
- IMPG2 c.829-1G>T Pathogenic/Likely pathogenic ★★ same type
- IMPG2 c.829-2A>T 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/impg2-p-val478 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown