9-21968241-G-C

Variant names:

• chr9-21968241-G-C
• rs778871932
• NM_000077.5:c.459C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 4P and 4B. PM2 PM5 BP4_Strong

The NM_000077.5(CDKN2A):​c.459C>G​(p.Asp153Glu) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D153N) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDKN2A NM_000077.5 missense, splice_region
• Scores: Splicing: ADA: 0.00002355
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.09
• Publications: 1 publications found

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

ENSG00000264545 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-21970902-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 216035.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.059338897).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKN2A	NM_000077.5	c.459C>G	p.Asp153Glu	missense_variant, splice_region_variant	Exon 3 of 3	ENST00000304494.10	NP_000068.1
CDKN2A	NM_058195.4	c.*103C>G		splice_region_variant	Exon 3 of 3	ENST00000579755.2	NP_478102.2
CDKN2A	NM_058195.4	c.*103C>G		3_prime_UTR_variant	Exon 3 of 3	ENST00000579755.2	NP_478102.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDKN2A	ENST00000304494.10	c.459C>G	p.Asp153Glu	missense_variant, splice_region_variant	Exon 3 of 3	1	NM_000077.5	ENSP00000307101.5
CDKN2A	ENST00000579755.2	c.*103C>G		splice_region_variant	Exon 3 of 3	1	NM_058195.4	ENSP00000462950.1
CDKN2A	ENST00000579755.2	c.*103C>G		3_prime_UTR_variant	Exon 3 of 3	1	NM_058195.4	ENSP00000462950.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	0.15
DANN	Benign	0.45
DEOGEN2	Benign	0.094	T;.;.;.
Eigen	Benign	-1.7
Eigen_PC	Benign	-1.8
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.23	T;.;.;T
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.059	T;T;T;T
MetaSVM	Benign	-0.95	T
PhyloP100		-2.1
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	-0.020	N;.;.;.
REVEL	Benign	0.15
Sift	Benign	1.0	T;.;.;.
Sift4G	Benign	1.0	T;T;T;T
Polyphen		0.0	B;.;.;.
Vest4		0.070
MutPred		0.32		Gain of phosphorylation at S152 (P = 0.3513);.;.;.;
MVP		0.73
ClinPred		0.025	T
GERP RS		-4.8
Varity_R		0.028
Mutation Taster		=35/65	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000024
dbscSNV1_RF	Benign	0.052
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs778871932; hg19: chr9-21968240;