PPP2CA p.Gln122=
c.366G>A · rs764595667 · VCV2855167
Likely benign
Multiple submitters
Classification
Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 2 submitters
gnomAD v4.1
Rare
very rare (popmax 0.00229%, nfe)
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 1.8 | GERP 0.9, phastCons 1 |
| Overall | ||
| CADD | 10.58 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00229%
European (non-Finnish) · 27/1,179,952 alleles
Filtering AF
0.00157%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00134%
Overall
0.00173%
28/1,613,902 alleles · very rare
exomes 28/1,461,570 · genomes 0/152,332 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| European (non-Finnish)grpmax | 0.00229% | 43,702 |
| Remaining individualsnot grpmax-eligible | 0.0016% | 62,498 |
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
- PPP2CA
- Protein
- p.Gln122=
- Coding
- c.366G>A
- MANE Select
- NM_002715
- dbSNP
- rs764595667
- Type
- single nucleotide variant
- Location
- chr5:134201968 (GRCh38)
- Gene constraint
- LOEUF 0.315 · pLI 1.00 (gnomAD)
- Structure
- AlphaFold pLDDT 94.86 · 50 PDB
- Residue 122
- a UniProt-annotated variant site (in hjs3; decreased phosphatase activity in an in vitro assay; no effect on the interaction with pp2a subunit a ppp2r1a/ppp2r1b; increased interaction with pp2a subunit b component strn3; no effect on interaction with other pp2a subunit b components); an α-helix
Similar variants
- PPP2CA p.Gln122His Likely pathogenic ★★ same residue
- PPP2CA p.Asp223His Pathogenic/Likely pathogenic ★★ same type
- PPP2CA p.Asp88Gly Pathogenic/Likely pathogenic ★★ same type
- PPP2CA p.His191Arg Pathogenic/Likely pathogenic ★★ same type
- PPP2CA p.Tyr127Cys Likely pathogenic ★★ same type
- PPP2CA p.Tyr265Cys Likely pathogenic ★★ same type
- PPP2CA p.Arg108Cys Uncertain significance ★★ ⚠ same type
- PPP2CA p.Asp57Asn 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/ppp2ca-p-gln122 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown