IMPG2 p.Arg1145=
c.3435G>A · VCV4963471
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
ultra-rare (popmax 0.0384%, 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 0.87 | GERP -1.6, phastCons 1 |
| Overall | ||
| CADD | 5.06 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0384%
South Asian · 35/91,068 alleles
Filtering AF
0.0283%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.0249%
Overall
0.00229%
37/1,613,770 alleles · ultra-rare
exomes 35/1,461,488 · genomes 2/152,282 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| South Asiangrpmax | 0.0384% | 2,602 |
| Remaining individualsnot grpmax-eligible | 0.0016% | 62,482 |
| European (non-Finnish) | 8.48e-05% | 1,179,866 |
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.Arg1145=
- Coding
- c.3435G>A
- MANE Select
- NM_016247
- Type
- single nucleotide variant
- Location
- chr3:101229578 (GRCh38)
- Gene constraint
- LOEUF 0.773 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 54.28
- Residue 1145
- the 'hyaluronan-binding motif involved in chondroitin sulfate c-binding' region; 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-arg1145 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown