Is CASK p.Gly170Ala (c.509G>C) pathogenic?

CASK p.Gly170Ala (c.509G>C) is classified Uncertain significance in CASK (ClinVar, Single submitter, 1 submitter; last evaluated 2023-08-01). AlphaMissense: ambiguous (0.4215); Absent from gnomAD v4.1.

How common is CASK p.Gly170Ala (c.509G>C) in the general population?

CASK p.Gly170Ala (c.509G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CASK p.Gly170Ala (c.509G>C)?

AlphaMissense predicts ambiguous (score 0.4215) — an in-silico prediction, not a clinical call.

CASK p.Gly170Ala

c.509G>C · rs2519234514 · VCV2660353

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4215 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Computational evidence

Protein change
AlphaMissense	0.4215	ambiguous
REVEL	0.316	indeterminate
SaProt	LLR -9.02	tolerated
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 1.6, phastCons 1
Regional constraint	o/e 0.31	constrained · MANE · 286 kb · p 1e-25 · regional, not allelic
Overall
CADD	23.3	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: CASK
Protein: p.Gly170Ala
Coding: c.509G>C
MANE Select: NM_001367721
dbSNP: rs2519234514
Type: single nucleotide variant
Location: chrX:41671451 (GRCh38)
Structure: AlphaFold pLDDT 79.45 · 22 PDB
Residue 170: the protein kinase domain; a UniProt-annotated variant site (found in a patient with epilepsy and pontocerebellar hypoplasia; likely pathogenic)

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

Similar variants

CASK p.Gly170= Likely benign ★ same residue
GPR82 p.Val170= Likely benign ★ same residue
CASK c.1015+1G>A Pathogenic ★★ same type
CASK c.1315-1G>A Pathogenic/Likely pathogenic ★★ same type
CASK c.2317+1G>A Pathogenic/Likely pathogenic ★★ same type
CASK c.2317+5G>A Pathogenic/Likely pathogenic ★★ same type
CASK c.2521-2A>G Pathogenic/Likely pathogenic ★★ same type
CASK c.59+2T>C Pathogenic/Likely pathogenic ★★ 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/cask-p-gly170ala (accessed [today's date]).

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