chr9-21971167-C-G

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1PM2BP6_Moderate

The NM_058195.4(CDKN2A):c.235G>C(p.Ala79Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000693 in 1,442,940 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely benign (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A79S) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

CDKN2A
NM_058195.4 missense

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 1.73

Publications

2 publications found

Variant links:

Genes affected

CDKN2A (HGNC:1787): (cyclin dependent kinase inhibitor 2A) This gene generates several transcript variants which differ in their first exons. At least three alternatively spliced variants encoding distinct proteins have been reported, two of which encode structurally related isoforms known to function as inhibitors of CDK4 kinase. The remaining transcript includes an alternate first exon located 20 Kb upstream of the remainder of the gene; this transcript contains an alternate open reading frame (ARF) that specifies a protein which is structurally unrelated to the products of the other variants. This ARF product functions as a stabilizer of the tumor suppressor protein p53 as it can interact with, and sequester, the E3 ubiquitin-protein ligase MDM2, a protein responsible for the degradation of p53. In spite of the structural and functional differences, the CDK inhibitor isoforms and the ARF product encoded by this gene, through the regulatory roles of CDK4 and p53 in cell cycle G1 progression, share a common functionality in cell cycle G1 control. This gene is frequently mutated or deleted in a wide variety of tumors, and is known to be an important tumor suppressor gene. [provided by RefSeq, Sep 2012]

CDKN2A Gene-Disease associations (from GenCC):

melanoma, cutaneous malignant, susceptibility to, 2
Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
melanoma-pancreatic cancer syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics
familial atypical multiple mole melanoma syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
melanoma and neural system tumor syndrome
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

CDKN2A links:

ENSG00000264545 (HGNC:):

ENSG00000264545 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM1

In a hotspot region, there are 10 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 18 benign, 32 uncertain in NM_058195.4

PM2

Very rare variant in population databases, with high coverage;

BP6

Variant 9-21971167-C-G is Benign according to our data. Variant chr9-21971167-C-G is described in ClinVar as Likely_benign. ClinVar VariationId is 3999775.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKN2A	NM_058195.4 link	c.235G>C	p.Ala79Pro	missense_variant	Exon 2 of 3	ENST00000579755.2	NP_478102.2	Q8N726-1
CDKN2A	NM_000077.5 link	c.192G>C	p.Leu64Leu	synonymous_variant	Exon 2 of 3	ENST00000304494.10	NP_000068.1	P42771-1K7PML8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDKN2A	ENST00000579755.2 link	c.235G>C	p.Ala79Pro	missense_variant	Exon 2 of 3	1	NM_058195.4	ENSP00000462950.1		Q8N726-1
CDKN2A	ENST00000304494.10 link	c.192G>C	p.Leu64Leu	synonymous_variant	Exon 2 of 3	1	NM_000077.5	ENSP00000307101.5		P42771-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.93e-7

AC:

AN:

1442940

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

718012

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33300

American (AMR)

AF:

0.00

AC:

AN:

44232

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25986

East Asian (EAS)

AF:

0.00

AC:

AN:

39364

South Asian (SAS)

AF:

0.00

AC:

AN:

85676

European-Finnish (FIN)

AF:

0.00

AC:

AN:

39280

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5374

European-Non Finnish (NFE)

AF:

9.01e-7

AC:

AN:

1109806

Other (OTH)

AF:

0.00

AC:

AN:

59922

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Benign:1

May 24, 2025

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Uncertain

0.089

BayesDel_noAF

Benign

-0.11

CADD

Benign

9.6

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.078

T;T

Eigen

Uncertain

0.25

Eigen_PC

Uncertain

0.23

FATHMM_MKL

Uncertain

0.83

LIST_S2

Benign

0.54

.;T

M_CAP

Pathogenic

0.29

MetaRNN

Uncertain

0.50

D;D

MetaSVM

Benign

-0.45

PhyloP100

1.7

PrimateAI

Uncertain

0.50

PROVEAN

Uncertain

-3.2

.;D

REVEL

Uncertain

0.42

Sift

Benign

0.089

.;T

Sift4G

Benign

0.15

T;T

Vest4

0.43

MVP

0.93

ClinPred

0.57

GERP RS

3.9

PromoterAI

-0.0092

Neutral

(source)

Mutation Taster

=2/98

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over