rs587776716

Variant names:

• chr9-21971114-ACGGGTCGGGTGAGAGTGGC-A
• rs587776716
• NM_000077.5:c.226_244delGCCACTCTCACCCGACCCG

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PVS1 PP5

The NM_000077.5(CDKN2A):​c.226_244delGCCACTCTCACCCGACCCG​(p.Ala76CysfsTer64) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic,risk factor (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDKN2A NM_000077.5 frameshift
• Clinical Significance: Pathogenic; risk factor no assertion criteria provided P:1 O:1
• Conservation: PhyloP100: 5.60
• 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: Likely_pathogenic. The variant received 9 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 9-21971114-ACGGGTCGGGTGAGAGTGGC-A is Pathogenic according to our data. Variant chr9-21971114-ACGGGTCGGGTGAGAGTGGC-A is described in ClinVar as Pathogenic|risk_factor. ClinVar VariationId is 9410.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000077.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDKN2A	NM_000077.5	MANE Select	c.226_244delGCCACTCTCACCCGACCCG	p.Ala76CysfsTer64	frameshift	Exon 2 of 3	NP_000068.1
	CDKN2A	NM_058195.4	MANE Plus Clinical	c.269_287delGCCACTCTCACCCGACCCG	p.Arg90LeufsTer76	frameshift	Exon 2 of 3	NP_478102.2
	CDKN2A	NM_001195132.2		c.226_244delGCCACTCTCACCCGACCCG	p.Ala76CysfsTer64	frameshift	Exon 2 of 4	NP_001182061.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDKN2A	ENST00000304494.10	TSL:1 MANE Select	c.226_244delGCCACTCTCACCCGACCCG	p.Ala76CysfsTer64	frameshift	Exon 2 of 3	ENSP00000307101.5
	CDKN2A	ENST00000579755.2	TSL:1 MANE Plus Clinical	c.269_287delGCCACTCTCACCCGACCCG	p.Arg90LeufsTer76	frameshift	Exon 2 of 3	ENSP00000462950.1
	CDKN2A	ENST00000498124.1	TSL:1	c.226_244delGCCACTCTCACCCGACCCG	p.Ala76CysfsTer64	frameshift	Exon 2 of 4	ENSP00000418915.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic; risk factor

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Melanoma-pancreatic cancer syndrome (1)
-	-	-	Melanoma, cutaneous malignant, susceptibility to, 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		5.6
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs587776716; hg19: chr9-21971113;