Is PRRT2 p.Arg245Cys (c.733C>T) pathogenic?

PRRT2 p.Arg245Cys (c.733C>T) is classified Uncertain significance in PRRT2 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-09-03). AlphaMissense: ambiguous (0.4935); Very rare (popmax 0.00402%, afr); Associated with episodic kinesigenic dyskinesia.

What condition is associated with PRRT2 p.Arg245Cys (c.733C>T)?

PRRT2 p.Arg245Cys (c.733C>T) is associated with episodic kinesigenic dyskinesia (ClinVar).

How common is PRRT2 p.Arg245Cys (c.733C>T) in the general population?

PRRT2 p.Arg245Cys (c.733C>T) is very rare (popmax 0.00402%, afr) (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.Arg245Cys (c.733C>T)?

AlphaMissense predicts ambiguous (score 0.4935) — an in-silico prediction, not a clinical call.

PRRT2 p.Arg245Cys

c.733C>T · rs746832889 · VCV1690520

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

ambiguous

0.4935 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00402%, afr)

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	0.4935	ambiguous
REVEL	0.452	indeterminate
SaProt	LLR -10.29	damaging
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP 7.6	GERP 1.2, phastCons 1
Regional constraint	o/e 1.16	unconstrained · MANE · 785 bp · p 0.003 · regional, not allelic
Overall
CADD	32.0	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

Grpmax group 0.00402% African / African-American · 3/74,590 alleles

Filtering AF 0.00107% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000496%

Overall 0.00112% 18/1,606,272 alleles · very rare exomes 17/1,454,196 · genomes 1/152,076 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00402%	24,863
East Asian	0.00223%	44,844
Admixed American	0.0017%	58,876
South Asian	0.00111%	90,054
European (non-Finnish)	0.00102%	98,020

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: PRRT2
Protein: p.Arg245Cys
Coding: c.733C>T
MANE Select: NM_145239
dbSNP: rs746832889
Type: single nucleotide variant
Location: chr16:29813787 (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-arg245cys (accessed [today's date]).

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