Is CDK4 p.Arg255Ser (c.763C>A) pathogenic?

CDK4 p.Arg255Ser (c.763C>A) is classified Uncertain significance in CDK4 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-07-05). AlphaMissense: likely benign (0.2796); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with CDK4 p.Arg255Ser (c.763C>A)?

CDK4 p.Arg255Ser (c.763C>A) is associated with hereditary neoplastic syndrome (ClinVar).

How common is CDK4 p.Arg255Ser (c.763C>A) in the general population?

CDK4 p.Arg255Ser (c.763C>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CDK4 p.Arg255Ser (c.763C>A)?

AlphaMissense predicts likely benign (score 0.2796) — an in-silico prediction, not a clinical call.

CDK4 p.Arg255Ser

c.763C>A · rs587778188 · VCV584517

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.2796 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.2796	likely benign
REVEL	0.082	moderately benign-leaning
SaProt	LLR -7.11	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 2	GERP 0.95, phastCons 1
Regional constraint	o/e 0.74	unconstrained · MANE · 3,189 bp · p 2e-07 · regional, not allelic
Overall
CADD	20.1	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: CDK4
Protein: p.Arg255Ser
Coding: c.763C>A
MANE Select: NM_000075
dbSNP: rs587778188
Type: single nucleotide variant
Location: chr12:57749238 (GRCh38)
Gene constraint: LOEUF 0.61 · pLI 0.57 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 87.56 · 15 PDB
Residue 255: the protein kinase domain; an α-helix

Full CDK4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CDK4 p.Arg255Cys Conflicting classifications of pathogenicity ★ ⚠ same residue
CDK4 p.Arg255His Conflicting classifications of pathogenicity ★ ⚠ same residue
CDK4 p.Arg255Pro Uncertain significance ★ ⚠ same residue
CDK4 p.Arg255= Likely benign ★ same residue
CDK4 p.Arg24Cys Pathogenic ★★ same condition
CDK4 p.Arg24His Pathogenic ★★ same condition
CDK4 c.354+3G>C Uncertain significance ★★ same condition
CDK4 c.354+5G>T 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/cdk4-p-arg255ser (accessed [today's date]).

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