Is CDKN2A p.Glu33= (c.99G>A) pathogenic?

CDKN2A p.Glu33= (c.99G>A) is classified Benign in CDKN2A (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-13). Very rare (popmax 0.00223%, eas); Associated with melanoma-pancreatic cancer syndrome.

What condition is associated with CDKN2A p.Glu33= (c.99G>A)?

CDKN2A p.Glu33= (c.99G>A) is associated with melanoma-pancreatic cancer syndrome (ClinVar).

How common is CDKN2A p.Glu33= (c.99G>A) in the general population?

CDKN2A p.Glu33= (c.99G>A) is very rare (popmax 0.00223%, eas) (gnomAD).

CDKN2A p.Glu33=

Q: How is Familial atypical multiple mole melanoma syndrome inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

c.99G>A · VCV4294174

Benign Single submitter

Classification

Benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00223%, eas)

Conditions

melanoma-pancreatic cancer syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.54	GERP 0.15
Overall
CADD	12.69	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00223% East Asian · 1/44,864 alleles

Overall 6.2e-05% 1/1,612,994 alleles · very rare exomes 1/1,460,690 · genomes 0/152,304 · joint denominator

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: CDKN2A
Protein: p.Glu33=
Coding: c.99G>A
MANE Select: NM_000077
Type: single nucleotide variant
Location: chr9:21974729 (GRCh38)
Gene constraint: LOEUF 0.791 · pLI 0.62 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 77.02 · 5 PDB
Residue 33: an α-helix; a UniProt-annotated variant site (in a biliary tract tumor); the 'interaction with cdk5rap3 and mdm2' region

Full CDKN2A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

melanoma-pancreatic cancer syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Familial atypical multiple mole melanoma syndrome (Orphanet):

Inheritance: Autosomal dominant
Onset: All ages

Similar variants

CDKN2A p.Glu33Gly Uncertain significance ★★ same residue
CDKN2A p.Glu33Lys Uncertain significance ★★ ⚠ same residue
CDKN2A p.Glu33Ter Likely pathogenic ★ same residue
CDKN2A p.Glu33Gln Uncertain significance ★ ⚠ same residue
CDKN2A p.Glu33Val Uncertain significance ★ same residue
CDKN2A c.150+1G>A Likely pathogenic ★★ same condition
CDKN2A c.150+2T>G Likely pathogenic ★★ same condition
CDKN2A c.151-1G>A Pathogenic ★★ 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/cdkn2a-p-glu33 (accessed [today's date]).

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