chr9-21971134-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 4P and 10B. PM1PM2BP4_ModerateBP6_Very_Strong

The NM_058195.4(CDKN2A):c.268C>T(p.Arg90Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000313 in 1,596,352 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. R90G) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000028 ( 0 hom. )

Consequence

CDKN2A
NM_058195.4 missense

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: -2.27

Publications

17 publications found

Variant links:

COSMIC-nc: COSV58683530

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: Likely_benign. The variant received -6 ACMG points.

PM1

In a hotspot region, there are 10 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 14 benign, 34 uncertain in NM_058195.4

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.20807382).

BP6

Variant 9-21971134-G-A is Benign according to our data. Variant chr9-21971134-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 833585.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKN2A	NM_058195.4 link	c.268C>T	p.Arg90Cys	missense_variant	Exon 2 of 3	ENST00000579755.2	NP_478102.2	Q8N726-1
CDKN2A	NM_000077.5 link	c.225C>T	p.Pro75Pro	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.268C>T	p.Arg90Cys	missense_variant	Exon 2 of 3	1	NM_058195.4	ENSP00000462950.1		Q8N726-1
CDKN2A	ENST00000304494.10 link	c.225C>T	p.Pro75Pro	synonymous_variant	Exon 2 of 3	1	NM_000077.5	ENSP00000307101.5		P42771-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000464

AC:

AN:

215646

AF XY:

0.00000836

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000301

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000277

AC:

AN:

1444056

Hom.:

Cov.:

AF XY:

0.00000557

AC XY:

AN XY:

718446

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33292

American (AMR)

AF:

0.0000228

AC:

AN:

43956

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25936

East Asian (EAS)

AF:

0.00

AC:

AN:

39306

South Asian (SAS)

AF:

0.00

AC:

AN:

85560

European-Finnish (FIN)

AF:

0.00

AC:

AN:

41520

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5564

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1108986

Other (OTH)

AF:

0.0000167

AC:

AN:

59936

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152296

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74472

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41582

American (AMR)

AF:

0.00

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000194

AC:

AN:

5166

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68000

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ClinVar

Significance: Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Benign:2

Aug 30, 2021

Color Diagnostics, LLC DBA Color Health

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 21, 2020

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. -

not provided

Benign:1

Jun 23, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Familial melanoma

Benign:1

Feb 07, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.039

BayesDel_noAF

Benign

-0.20

CADD

Benign

7.4

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.058

T;T

Eigen

Benign

-0.59

Eigen_PC

Benign

-0.79

FATHMM_MKL

Benign

0.15

LIST_S2

Benign

0.57

.;T

M_CAP

Uncertain

0.13

MetaRNN

Benign

0.21

T;T

MetaSVM

Benign

-0.55

PhyloP100

-2.3

PrimateAI

Benign

0.42

PROVEAN

Uncertain

-2.8

.;D

REVEL

Uncertain

0.35

Sift

Benign

0.047

.;D

Sift4G

Benign

0.18

T;T

Vest4

0.39

MVP

0.79

ClinPred

0.32

GERP RS

-7.1

PromoterAI

0.0061

Neutral

(source)

Mutation Taster

=23/77

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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over