Is CDKN2A p.Arg24Leu (c.71G>T) pathogenic?

CDKN2A p.Arg24Leu (c.71G>T) is classified Uncertain significance in CDKN2A (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-09-10). AlphaMissense: likely benign (0.2995); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with CDKN2A p.Arg24Leu (c.71G>T)?

CDKN2A p.Arg24Leu (c.71G>T) is associated with hereditary neoplastic syndrome, melanoma and neural system tumor syndrome, familial melanoma (ClinVar).

How common is CDKN2A p.Arg24Leu (c.71G>T) in the general population?

CDKN2A p.Arg24Leu (c.71G>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CDKN2A p.Arg24Leu (c.71G>T)?

AlphaMissense predicts likely benign (score 0.2995) — an in-silico prediction, not a clinical call.

CDKN2A p.Arg24Leu

c.71G>T · rs104894097 · VCV532272

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.2995 · 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	0.2995	likely benign
REVEL	0.246	benign-leaning
SaProt	LLR -7.67	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 -1.7	GERP -0.71
Regional constraint	o/e 1.13	unconstrained · MANE · 6,595 bp · p 0.04 · regional, not allelic
Overall
CADD	17.31	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: CDKN2A
Protein: p.Arg24Leu
Coding: c.71G>T
MANE Select: NM_000077
dbSNP: rs104894097
Type: single nucleotide variant
Location: chr9:21974757 (GRCh38)
Gene constraint: LOEUF 0.791 · pLI 0.62 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 77.02 · 5 PDB
Residue 24: a UniProt-annotated variant site (in cmm2); a UniProt-annotated variant site (found in a patient with multiple primary melanoma; partial loss of cdk4 binding); the 'interaction with cdk5rap3 and mdm2' region

Full CDKN2A 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

Also linked: melanoma and neural system tumor syndrome familial melanoma

Similar variants

CDKN2A p.Arg24Pro Pathogenic/Likely pathogenic ★★ same residue
CDKN2A p.Arg24Gly Uncertain significance ★★ ⚠ same residue
CDKN2A p.Val24Ala Uncertain significance ★★ same residue
CDKN2A p.Arg24= Benign/Likely benign ★★ same residue
CDKN2A p.Val24= Benign/Likely benign ★★ same residue
CDKN2A p.Arg24Gln Conflicting classifications of pathogenicity ★ ⚠ same residue
CDKN2A p.Arg24Trp Uncertain significance ★ ⚠ same residue
CDKN2A p.Val24Leu Uncertain significance ★ same residue

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/cdkn2a-p-arg24leu (accessed [today's date]).

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