Is CDK13 p.Ala331Val (c.992C>T) pathogenic?

CDK13 p.Ala331Val (c.992C>T) is classified Uncertain significance in CDK13 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-04-01). AlphaMissense: likely benign (0.1039); Ultra-rare (popmax 0.0102%, afr); Associated with Inborn genetic diseases.

What condition is associated with CDK13 p.Ala331Val (c.992C>T)?

CDK13 p.Ala331Val (c.992C>T) is associated with Inborn genetic diseases (ClinVar).

How common is CDK13 p.Ala331Val (c.992C>T) in the general population?

CDK13 p.Ala331Val (c.992C>T) is ultra-rare (popmax 0.0102%, afr) (gnomAD).

What do computational predictors say about CDK13 p.Ala331Val (c.992C>T)?

AlphaMissense predicts likely benign (score 0.1039) — an in-silico prediction, not a clinical call.

CDK13 p.Ala331Val

c.992C>T · rs996434597 · VCV2657400

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.1039 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0102%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.1039	likely benign
REVEL	0.075	moderately benign-leaning
SaProt	LLR -6.50	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.3	GERP 1.4, phastCons 1
Regional constraint	o/e 1.13	unconstrained · MANE · 47 kb · p 8.4e-05 · regional, not allelic
Overall
CADD	23.4	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

Grpmax group 0.0102% African / African-American · 7/68,484 alleles

Filtering AF 0.00474% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00332%

Overall 0.00142% 21/1,477,782 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0102%	9,783
Remaining individualsnot grpmax-eligible	0.00356%	28,118
European (non-Finnish)	0.00107%	93,208

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: CDK13
Protein: p.Ala331Val
Coding: c.992C>T
MANE Select: NM_003718
dbSNP: rs996434597
Type: single nucleotide variant
Location: chr7:39951633 (GRCh38)
Gene constraint: LOEUF 0.434 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 50.59 · 2 PDB
Residue 331: the 'disordered' region

Full CDK13 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CDK13 p.Ala331= Likely benign ★ same residue
CDK13 p.Ala1301Val Uncertain significance ★★ ⚠ same condition
CDK13 p.Ala134Val Uncertain significance ★★ ⚠ same condition
CDK13 p.Ala182Val Uncertain significance ★★ ⚠ same condition
CDK13 p.Ala504Val Uncertain significance ★★ ⚠ same condition
CDK13 p.Ala970Val Uncertain significance ★★ ⚠ same condition
CDK13 p.Arg1366Cys Uncertain significance ★★ ⚠ same condition
CDK13 p.Arg197Ser 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/cdk13-p-ala331val (accessed [today's date]).

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