Is PRRT2 p.Ser28Cys (c.83C>G) pathogenic?

PRRT2 p.Ser28Cys (c.83C>G) is classified Uncertain significance in PRRT2 (ClinVar, Single submitter, 1 submitter; last evaluated 2020-07-21). AlphaMissense: likely benign (0.101); Absent from gnomAD v4.1; Associated with episodic kinesigenic dyskinesia.

What condition is associated with PRRT2 p.Ser28Cys (c.83C>G)?

PRRT2 p.Ser28Cys (c.83C>G) is associated with episodic kinesigenic dyskinesia (ClinVar).

How common is PRRT2 p.Ser28Cys (c.83C>G) in the general population?

PRRT2 p.Ser28Cys (c.83C>G) is absent from gnomAD v4.1 (gnomAD).

How is Paroxysmal kinesigenic dyskinesia inherited?

Typically Autosomal dominant, Not applicable (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about PRRT2 p.Ser28Cys (c.83C>G)?

AlphaMissense predicts likely benign (score 0.101) — an in-silico prediction, not a clinical call.

PRRT2 p.Ser28Cys

c.83C>G · rs1900061006 · VCV1044105

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.101 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

episodic kinesigenic dyskinesia

⚠ Built without this gene's context — gene constraint and dosage, protein structure, pathways, panels and related-variant links were not looked up for this page. why

Computational evidence

Protein change
AlphaMissense	0.101	likely benign
REVEL	0.152	moderately benign-leaning
SaProt	LLR -8.75	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP 4.9	GERP 1.4, phastCons 1
Regional constraint	o/e 1.16	unconstrained · MANE · 785 bp · p 0.003 · regional, not allelic
Overall
CADD	21.8	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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: PRRT2
Protein: p.Ser28Cys
Coding: c.83C>G
MANE Select: NM_145239
dbSNP: rs1900061006
Type: single nucleotide variant
Location: chr16:29813137 (GRCh38)

Full PRRT2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

episodic kinesigenic dyskinesia — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Paroxysmal kinesigenic dyskinesia (Orphanet):

Inheritance: Autosomal dominant, Not applicable
Onset: Adolescent, Adult, Childhood, Infancy
Prevalence: 1-9 / 1 000 000 (Worldwide)

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/prrt2-p-ser28cys (accessed [today's date]).

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