# NM_002708.4(PPP1CA):c.344C>G (p.Pro115Arg)

https://sugi.bio/variant/ppp1ca-p-pro115arg

## Summary

**PPP1CA p.Pro115Arg (c.344C>G)** is classified **Uncertain significance** in PPP1CA (ClinVar, Single submitter, 1 submitter; last evaluated 2023-03-20). AlphaMissense: likely pathogenic (0.6819); Very rare (popmax 0.00267%, afr).

**At a glance:** Uncertain significance · review: Single submitter · rsID rs1244315422 · 1 submitter · AlphaMissense likely pathogenic · very rare (popmax 0.00267%, afr)

## For patients & families {#patients}

This is a change in the PPP1CA gene that is currently of uncertain significance — a definitive interpretation has not yet been established, submitted by 1 submitter.

*Reference information, not medical advice, and not a prediction for any individual. A genetic counselor or clinician can interpret what it means for you and your family.*

**Support & next steps:** [Find a genetic counselor (NSGC)](https://findageneticcounselor.nsgc.org/).

## Identity {#identity}

| Field | Value |
| --- | --- |
| Gene | [PPP1CA](https://sugi.bio/atlas/gene/PPP1CA/) |
| Protein change (HGVS p.) | p.Pro115Arg |
| Coding change (HGVS c.) | c.344C>G |
| MANE Select transcript | [NM_002708](https://www.ncbi.nlm.nih.gov/nuccore/NM_002708) |
| dbSNP | [rs1244315422](https://www.ncbi.nlm.nih.gov/snp/rs1244315422/) |
| Variant type | single nucleotide variant |
| Location | chr11:67400763-67400763 (GRCh38) |
| ClinVar | [VCV2527366](https://www.ncbi.nlm.nih.gov/clinvar/variation/2527366/) |

**All HGVS expressions:** `NC_000011.10:g.67400763G>C`, `NC_000011.9:g.67168234G>C`, `NM_001008709.2:c.377C>G`, `NM_002708.4:c.344C>G`, `NM_206873.2:c.212C>G`

## Computational & population evidence {#evidence}

**Concordance:** Mixed / partial computational evidence (see below).

- AlphaMissense **likely pathogenic** (0.6819)
- REVEL 0.595 (indeterminate)
- SaProt LLR -9.638 (tolerated) — differs from AlphaMissense
- → **In-silico consensus:** AlphaMissense calls this damaging; SaProt does not; REVEL is indeterminate
- Conservation: phyloP 11.833, GERP 2.47, phastCons 1 — highly conserved (agrees)
- CADD: **PHRED 32.0**. No single ClinGen-calibrated threshold exists and the expert panels that use CADD disagree — GUCY2D/AIPL1 require ≥ 20.0 for an untranslated-region variant, ABCA4 ≥ 28.1 for a synonymous or indel variant, the Pulmonary Hypertension panel imports Pejaver 2022's missense-calibrated numbers, and the Antibody Deficiencies panel declines CADD entirely for PIK3CD. CADD v1.7 also incorporates Zoonomia phyloP, so it partly re-expresses the conservation above. *Descriptive; no threshold applied.*
- Regional missense constraint: **o/e 0.50** across the covering region of the MANE Select transcript (67,398,728–67,401,188), spanning 2,460 bp. Chi-square p 8.2e-21. Describes the region, not this allele; gnomAD v4.1.1's own constrained determination. *Descriptive; no ACMG code applied.*
- SpliceAI: **no splice effect predicted**. SpliceAI outputs four numbers per variant, not one: acceptor loss, donor loss, acceptor gain, donor gain (DS_AL / DS_DL / DS_AG / DS_DG). A loss score is an existing splice site weakened or destroyed; a gain score is a new site created or an existing one strengthened. The release publishes its own filter rule, which we read from the dataset rather than assume: an allele is reported only if the largest of its four deltas reaches 0.2. No allele at this position is in the release, so all four are under 0.2 for every alternate allele here. No figure is shown because none was read: the bound is deduced from that absence. It is a result, not a gap in our data, because the release scores every possible substitution across the transcripts it covers (Ensembl MANE v1.4) before it filters, so what survives for a gene is one continuous stretch. What is measured is that this position sits inside the stretch covered for PPP1CA (318 scored positions, the nearest 6 bases away); what is taken from the release's own description, rather than measured, is that coverage inside that stretch is continuous. On that, SpliceAI did score it. *ClinGen's SVI treats the largest of the four as evidence against a splicing effect at or below 0.1, where it may support BP4, and as uninformative between 0.1 and 0.2. We cannot tell which applies here, so these SpliceAI data support neither BP4 nor PP3; that is a statement about this evidence alone, not about the variant's other evidence.*
- Population frequency (gnomAD v4.1): grpmax **0.00267%** (afr) · FAF95 0.000443% · FAF99 0.000166% · 2/74,942 in the highest group · 2/1,613,978 alleles overall — very rare (popmax 0.00267%, afr).

*Computational predictors are not independent (ClinGen Variant Classification guidance): AlphaMissense (Cheng et al. 2023) carries the ACMG weight for missense and conservation (phyloP/GERP/phastCons) for non-missense; REVEL (Pejaver-2022 calibrated strength bands) and SaProt (Su et al. 2023, structure-aware, ClinVar-independent protein language model, raw LLR) are shown as orthogonal agreement signals, not additive. For frequency, the gnomAD v4.1 grpmax filtering allele frequency (FAF95) is ClinGen's designated BA1/BS1 input (gnomAD v4 guidance v3.0, June 2025); BA1/BS1 thresholds are disease-specific, not a blanket 5%. Predictions, not a clinical determination.*

## Gene constraint & dosage {#gene-context}

**PPP1CA** population constraint: LOEUF 0.554, pLI 0.86386, missense-Z 3.0029. *Lower LOEUF and higher pLI indicate a gene that tolerates loss-of-function poorly; ClinGen dosage is the curated haploinsufficiency call.*

## Protein context {#protein}

Residue **115** lies in a turn.

AlphaFold model confidence (whole protein): pLDDT 91.65, 87% of residues very-high.

**46 experimental structure(s)** (PDB): [3E7A](https://www.rcsb.org/structure/3E7A), [3E7B](https://www.rcsb.org/structure/3E7B), [3EGG](https://www.rcsb.org/structure/3EGG), [3EGH](https://www.rcsb.org/structure/3EGH), [3HVQ](https://www.rcsb.org/structure/3HVQ), [3N5U](https://www.rcsb.org/structure/3N5U) — incl. mutant structure 6ZK6.

## What this gene does {#gene-function}

*Describes the biological roles of PPP1CA (the gene this variant disrupts) — not effects measured for this specific variant. A damaging variant is expected to affect these functions and pathways; the degree depends on the variant.*

**How this variant is thought to act:** PPP1CA's established molecular role includes phosphoprotein phosphatase activity. In Reactome, PPP1CA is annotated in disease pathway(s) including **Maturation of hRSV A proteins**.

**Disease mechanism (Reactome):** PPP1CA loss or alteration is curated in [Maturation of hRSV A proteins](https://reactome.org/content/detail/R-HSA-9828806).

### Pathways affected {#pathways}

PPP1CA participates in **6 Reactome pathways** (⚕ = disease pathway):

| Pathway (Reactome) | Evidence |
| --- | --- |
| ⚕ [Maturation of hRSV A proteins](https://reactome.org/content/detail/R-HSA-9828806) | curated |
| [DARPP-32 events](https://reactome.org/content/detail/R-HSA-180024) | curated |
| [mRNA Polyadenylation](https://reactome.org/content/detail/R-HSA-9770562) | curated |
| [Downregulation of TGF-beta receptor signaling](https://reactome.org/content/detail/R-HSA-2173788) | electronic |
| [Phosphorylation and nuclear translocation of the CRY:PER:kinase complex](https://reactome.org/content/detail/R-HSA-9931530) | electronic |
| [Triglyceride catabolism](https://reactome.org/content/detail/R-HSA-163560) | electronic |

### Molecular function & processes (GO — experimentally supported) {#go}

**Molecular function:** phosphoprotein phosphatase activity, protein serine/threonine phosphatase activity, iron ion binding, phosphatase activity, transition metal ion binding, cadherin binding involved in cell-cell adhesion.

**Biological process:** RNA polymerase II promoter clearance, protein dephosphorylation, positive regulation of transcription elongation by RNA polymerase II, negative regulation of transcription elongation by RNA polymerase II, regulation of circadian rhythm, telomere maintenance in response to DNA damage.

## Clinical significance {#significance}

**Uncertain significance** — review status Single submitter *(criteria provided, single submitter)*, last evaluated 2023-03-20.

**Submitter consensus:** unanimous (1/1 Uncertain significance).

### Submitter classifications {#submitters}

| Submitter | Classification | Review | Method | Date |
| --- | --- | --- | --- | --- |
| Ambry Genetics | Uncertain significance | criteria provided, single submitter | clinical testing | 2023-03-20 |

**Reported phenotype names (ClinVar):** not specified, AllHighlyPenetrant.

## Similar variants {#similar}

Related PPP1CA variant pages (same residue, condition, or type): [PPP1CA c.56-31T>C](/variant/ppp1ca-c-56-minus-31t-c), [PPP1CA p.Ala326Thr](/variant/ppp1ca-p-ala326thr), [PPP1CA p.Arg187Trp](/variant/ppp1ca-p-arg187trp), [PPP1CA p.Arg261Gln](/variant/ppp1ca-p-arg261gln), [PPP1CA p.Arg323Cys](/variant/ppp1ca-p-arg323cys), [PPP1CA p.Arg323His](/variant/ppp1ca-p-arg323his), [PPP1CA p.Asn145Ser](/variant/ppp1ca-p-asn145ser), [PPP1CA p.Asn278Ser](/variant/ppp1ca-p-asn278ser).

### Data sources & attribution {#sources}

ClinVar (NCBI — public domain, built 2026-10-14); gnomAD v4.1 (Broad Institute, built 2026-10-15); AlphaMissense (Cheng et al. 2023, © Google DeepMind — CC BY 4.0, built 2026-01-27); REVEL (Ioannidis et al. 2016 — ODbL, built 2026-07-13); SaProt (Su et al. 2023 — MIT, built 2026-10-14); SpliceAI (Illumina — free for non-commercial use, built 2026-10-13); CADD (Rentzsch et al. 2019, University of Washington — free for non-commercial use, built 2026-10-10); Conservation (phyloP/phastCons/GERP) (UCSC hg38 470-way mammal (Hiller Lab) + Ensembl Compara, built 2026-07-12); gnomAD Non-coding Constraint (Gnocchi) (Chen et al. 2024, Broad Institute — CC0, built 2026-10-11); gnomAD Regional Missense Constraint (Broad Institute — CC0, built 2026-10-13); Pangolin (Zeng & Li 2022 — CC BY 4.0, built 2026-10-11); Repeat regions (UCSC — RepeatMasker, TRF, segmental duplications, built 2026-10-11); ClinGen (ClinGen, built 2026-09-22); UniProt (CC BY 4.0); Reactome / GO (CC BY 4.0, built 2026-09-23); MaveDB (per-record license, built 2026-10-11); CIViC (CC0, built 2026-09-22); Orphanet (Orphanet, built 2026-06-12)

*Primary record: NCBI ClinVar (variation 2527366). Classifications reflect these databases as of the page's build date and may change. Free reference use — not medical advice; consult the primary submitters and a clinician.*