Is CDK12 p.Asp684His (c.2050G>C) pathogenic?

CDK12 p.Asp684His (c.2050G>C) is classified Uncertain significance in CDK12 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-12-04). AlphaMissense: ambiguous (0.421); Very rare (popmax 0.00167%, amr).

How common is CDK12 p.Asp684His (c.2050G>C) in the general population?

CDK12 p.Asp684His (c.2050G>C) is very rare (popmax 0.00167%, amr) (gnomAD).

What do computational predictors say about CDK12 p.Asp684His (c.2050G>C)?

AlphaMissense predicts ambiguous (score 0.421) — an in-silico prediction, not a clinical call.

CDK12 p.Asp684His

c.2050G>C · VCV3489357

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.421 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.421	ambiguous
REVEL	0.242	benign-leaning
SaProt	LLR -6.23	tolerated
⇒ REVEL and SaProt both call this tolerated; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.7, phastCons 1
Regional constraint	o/e 1.05	unconstrained · MANE · 20 kb · p 0.37 · regional, not allelic
Overall
CADD	25.5	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 0.00167% Admixed American · 1/59,952 alleles

Overall 0.000137% 2/1,461,630 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	59,952
African / African-American	0.00133%	74,934

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: CDK12
Protein: p.Asp684His
Coding: c.2050G>C
MANE Select: NM_016507
Type: single nucleotide variant
Location: chr17:39490675 (GRCh38)
Gene constraint: LOEUF 0.21 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 51.39 · 39 PDB
Residue 684: the 'disordered' region

Full CDK12 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CDK12 p.Asp684= Likely benign ★ same residue
CDK12 c.2108+56T>A Benign/Likely benign ★★ same type
CDK12 c.2666+17A>C Benign ★★ same type
CDK12 c.2769-74G>A Benign ★★ same type
CDK12 c.2846+157G>T Benign ★★ same type
CDK12 c.2963+111T>A Benign ★★ same type
CDK12 c.2963+133G>A Benign ★★ same type
CDK12 c.3308-116C>T Benign ★★ 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/cdk12-p-asp684his (accessed [today's date]).

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