rs3731246

Positions:

• chr9-21971990-C-G

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_000077.5(CDKN2A):​c.151-782G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.11 in 152,068 control chromosomes in the GnomAD database, including 950 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency: Genomes: 𝑓 0.11 (950 hom., cov: 32)
• Consequence: CDKN2A NM_000077.5 intron
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.904

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]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BP6: Variant 9-21971990-C-G is Benign according to our data. Variant chr9-21971990-C-G is described in ClinVar as [Benign]. Clinvar id is 1282809.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.142 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDKN2A	NM_000077.5	c.151-782G>C		intron_variant		ENST00000304494.10	NP_000068.1
CDKN2A	NM_058195.4	c.194-782G>C		intron_variant		ENST00000579755.2	NP_478102.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDKN2A	ENST00000304494.10	c.151-782G>C		intron_variant		1	NM_000077.5	ENSP00000307101	P2
CDKN2A	ENST00000579755.2	c.194-782G>C		intron_variant		1	NM_058195.4	ENSP00000462950

Frequencies

GnomAD3 genomes AF: 0.110 AC: 16766 AN: 151950 Hom.: 950 Cov.: 32

Gnomad AFR AF: 0.145

Gnomad AMI AF: 0.0702

Gnomad AMR AF: 0.0885

Gnomad ASJ AF: 0.114

Gnomad EAS AF: 0.0210

Gnomad SAS AF: 0.0523

Gnomad FIN AF: 0.0926

Gnomad MID AF: 0.134

Gnomad NFE AF: 0.108

Gnomad OTH AF: 0.104

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

GnomAD4 genome AF: 0.110 AC: 16784 AN: 152068 Hom.: 950 Cov.: 32 AF XY: 0.108 AC XY: 8050 AN XY: 74350

Gnomad4 AFR AF: 0.145

Gnomad4 AMR AF: 0.0884

Gnomad4 ASJ AF: 0.114

Gnomad4 EAS AF: 0.0214

Gnomad4 SAS AF: 0.0524

Gnomad4 FIN AF: 0.0926

Gnomad4 NFE AF: 0.108

Gnomad4 OTH AF: 0.102

Alfa AF: 0.108 Hom.: 94

Bravo AF: 0.111

Asia WGS AF: 0.0540 AC: 188 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Feb 24, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	1.6
DANN	Benign	0.49

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

LitVar

Other links and lift over

dbSNP: rs3731246; hg19: chr9-21971989;