Is PPP3CA p.Ala223Pro (c.667G>C) pathogenic?

PPP3CA p.Ala223Pro (c.667G>C) is classified Uncertain significance in PPP3CA (ClinVar, Single submitter, 1 submitter; last evaluated 2022-03-13). AlphaMissense: ambiguous (0.5587); Absent from gnomAD v4.1.

How common is PPP3CA p.Ala223Pro (c.667G>C) in the general population?

PPP3CA p.Ala223Pro (c.667G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about PPP3CA p.Ala223Pro (c.667G>C)?

AlphaMissense predicts ambiguous (score 0.5587) — an in-silico prediction, not a clinical call.

PPP3CA p.Ala223Pro

c.667G>C · rs2475915914 · VCV2103376

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.5587 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Computational evidence

Protein change
AlphaMissense	0.5587	ambiguous
REVEL	0.317	indeterminate
SaProt	LLR -12.91	damaging
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 2.6, phastCons 1
Regional constraint	o/e 0.40	unconstrained · MANE · 170 kb · p 4.9e-41 · regional, not allelic
Overall
CADD	27.1	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: PPP3CA
Protein: p.Ala223Pro
Coding: c.667G>C
MANE Select: NM_000944
dbSNP: rs2475915914
Type: single nucleotide variant
Location: chr4:101093891 (GRCh38)
Gene constraint: LOEUF 0.243 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 86.24 · 21 PDB
Residue 223: the 'catalytic' region; a β-strand

Full PPP3CA gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

PPP3CA c.1340-2A>G Pathogenic/Likely pathogenic ★★ same type
PPP3CA p.Ala447Thr Pathogenic/Likely pathogenic ★★ ⚠ same type
PPP3CA p.Arg254Ser Pathogenic/Likely pathogenic ★★ same type
PPP3CA p.Asp234Glu Pathogenic/Likely pathogenic ★★ same type
PPP3CA p.Glu282Lys Pathogenic/Likely pathogenic ★★ same type
PPP3CA p.Glu456Ter Pathogenic/Likely pathogenic ★★ same type
PPP3CA p.His92Arg Pathogenic/Likely pathogenic ★★ same type
PPP3CA c.1081+4T>A 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/ppp3ca-p-ala223pro (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown