Is PPP3CA p.Pro186= (c.558C>A) pathogenic?

PPP3CA p.Pro186= (c.558C>A) is classified Likely benign in PPP3CA (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-12-24). Ultra-rare (popmax 0.0301%, amr); Associated with arthrogryposis, cleft palate, craniosynostosis, and impaired intellectual development.

How common is PPP3CA p.Pro186= (c.558C>A) in the general population?

PPP3CA p.Pro186= (c.558C>A) is ultra-rare (popmax 0.0301%, amr) (gnomAD).

PPP3CA p.Pro186=

Q: What condition is associated with PPP3CA p.Pro186= (c.558C>A)?

PPP3CA p.Pro186= (c.558C>A) is associated with arthrogryposis, cleft palate, craniosynostosis, and impaired intellectual development, developmental and epileptic encephalopathy 91 (ClinVar).

c.558C>A · rs575861563 · VCV1594544

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0301%, amr)

Conditions

arthrogryposis, cleft palate, craniosynostosis, and impaired intellectual development

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 -0.19	GERP -5.6, phastCons 0.013
Overall
CADD	6.761	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0301% Admixed American · 18/59,848 alleles

Filtering AF 0.0194% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.016%

Overall 0.00124% 20/1,612,430 alleles · ultra-rare exomes 11/1,460,192 · genomes 9/152,238 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0301%	3,325
Remaining individualsnot grpmax-eligible	0.0032%	31,225

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: PPP3CA
Protein: p.Pro186=
Coding: c.558C>A
MANE Select: NM_000944
dbSNP: rs575861563
Type: single nucleotide variant
Location: chr4:101098451 (GRCh38)
Gene constraint: LOEUF 0.243 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 86.24 · 21 PDB
Residue 186: the 'catalytic' region

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

Disease context

arthrogryposis, cleft palate, craniosynostosis, and impaired intellectual development — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: developmental and epileptic encephalopathy 91

Similar variants

PPP3CA p.Ala447Thr Pathogenic/Likely pathogenic ★★ ⚠ same condition
PPP3CA p.Arg254Ser Pathogenic/Likely pathogenic ★★ same condition
PPP3CA p.Asp234Glu Pathogenic/Likely pathogenic ★★ same condition
PPP3CA p.Glu282Lys Pathogenic/Likely pathogenic ★★ same condition
PPP3CA p.His92Arg Pathogenic/Likely pathogenic ★★ same condition
PPP3CA c.860+3G>A Uncertain significance ★★ same condition
PPP3CA p.Arg28Gln Uncertain significance ★★ ⚠ same condition
PPP3CA p.Arg28Trp Uncertain significance ★★ same condition

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-pro186 (accessed [today's date]).

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