rs397508027

Positions:

• chr13-32379783-TATA-TTT

Variant summary

Our verdict is Pathogenic. Variant got 22 ACMG points: 22P and 0B. PVS1 PS1 PM2 PP5_Very_Strong

The NM_000059.4(BRCA2):​c.8988_8990delATAinsTT​(p.Leu2996fs) variant causes a frameshift, missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★★). Another nucleotide change resulting in same amino acid change has been previously reported as Pathogenicin Lovd. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: BRCA2 NM_000059.4 frameshift, missense
• Clinical Significance: Pathogenic reviewed by expert panel P:5
• Conservation: PhyloP100: 0.519

Genes affected

BRCA2 (HGNC:1101): (BRCA2 DNA repair associated) Inherited mutations in BRCA1 and this gene, BRCA2, confer increased lifetime risk of developing breast or ovarian cancer. Both BRCA1 and BRCA2 are involved in maintenance of genome stability, specifically the homologous recombination pathway for double-strand DNA repair. The largest exon in both genes is exon 11, which harbors the most important and frequent mutations in breast cancer patients. The BRCA2 gene was found on chromosome 13q12.3 in human. The BRCA2 protein contains several copies of a 70 aa motif called the BRC motif, and these motifs mediate binding to the RAD51 recombinase which functions in DNA repair. BRCA2 is considered a tumor suppressor gene, as tumors with BRCA2 mutations generally exhibit loss of heterozygosity (LOH) of the wild-type allele. [provided by RefSeq, May 2020]

BRCA2 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 22 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PS1: Transcript NM_000059.4 (BRCA2) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in Lovd
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 13-32379784-ATA-TT is Pathogenic according to our data. Variant chr13-32379784-ATA-TT is described in ClinVar as [Pathogenic]. Clinvar id is 52721.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.8988_8990delATAinsTT	p.Leu2996fs	frameshift_variant, missense_variant	23/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.8988_8990delATAinsTT	p.Leu2996fs	frameshift_variant, missense_variant	23/27	5	NM_000059.4	ENSP00000369497.3
BRCA2	ENST00000530893.7	c.8619_8621delATAinsTT	p.Leu2873fs	frameshift_variant, missense_variant	23/27	1		ENSP00000499438.2
BRCA2	ENST00000614259.2	n.*1046_*1048delATAinsTT		non_coding_transcript_exon_variant	22/26	2		ENSP00000506251.1
BRCA2	ENST00000614259.2	n.*1046_*1048delATAinsTT		3_prime_UTR_variant	22/26	2		ENSP00000506251.1

Frequencies

GnomAD3 genomes Cov.: 33

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

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 2 Pathogenic:2

Pathogenic, reviewed by expert panel	curation	Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)	Sep 08, 2016	Variant allele predicted to encode a truncated non-functional protein. -
Pathogenic, criteria provided, single submitter	clinical testing	Genologica Medica	Jan 01, 2017	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Quest Diagnostics Nichols Institute San Juan Capistrano

Jan 21, 2020

This frameshift variant causes the premature termination of BRCA2 protein synthesis. In addition, it has been reported in a family affected with breast cancer in the published literature (PMID: 19616529 (2009)). Based on the available information, this variant is classified as pathogenic. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 03, 2021

The c.8988_8990delATAinsTT pathogenic mutation, located in coding exon 22 of the BRCA2 gene, results from the deletion of 3 nucleotides and insertion of two nucleotides at positions 8988 to 8990, causing a translational frameshift with a predicted alternate stop codon (p.L2996Ffs*5). This variant has been identified in individuals with a personal and/or family history suspicious for Hereditary Breast and Ovarian Cancer syndrome, including male patients with breast cancer (Jiménez Ide J et al, Clin. Biochem. 2009 Oct;42:1572-6; Esteban Cardeñosa E et al. Breast Cancer Res Treat, 2010 May;121:257-60; de Juan Jiménez I et al. Fam Cancer, 2013 Dec;12:767-77; de Juan I et al. Fam Cancer, 2015 Dec;14:505-13; Pajares B et al. BMC Cancer, 2018 Jun;18:647). Of note, this alteration is also designated as 9216_9218delATAinsTT in published literature. In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Hereditary breast ovarian cancer syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 10, 2015

This sequence change deletes 3 nucleotides and inserts 2 nucleotides in exon 23 of the BRCA2 mRNA (c.8988_2990delATAinsTT), causing a frameshift at codon 2996. This creates a premature translational stop signal (p.Leu2996Phefs*5) and is expected to result in an absent or disrupted protein product. Truncating variants in BRCA2 are known to be pathogenic. This particular truncation has been reported in the literature (PMID: 19616529). This variant is also known as c.9216_9218delATAinsTT in the literature. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs397508027; hg19: chr13-32953921;