rs80359589

chr13-32340795-ACT-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1 PP5_Very_Strong

The NM_000059.4(BRCA2):c.6443_6444del(p.Ser2148TyrfsTer2) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. Variant has been reported in ClinVar as Pathogenic (★★★). Synonymous variant affecting the same amino acid position (i.e. H2147H) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: BRCA2 NM_000059.4 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:8
• Conservation: PhyloP100: -0.770

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]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 13-32340795-ACT-A is Pathogenic according to our data. Variant chr13-32340795-ACT-A is described in ClinVar as [Pathogenic]. Clinvar id is 52097.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr13-32340795-ACT-A is described in Lovd as [Pathogenic]. Variant chr13-32340795-ACT-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA2	NM_000059.4	c.6443_6444del	p.Ser2148TyrfsTer2	frameshift_variant	11/27	ENST00000380152.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA2	ENST00000380152.8	c.6443_6444del	p.Ser2148TyrfsTer2	frameshift_variant	11/27	5	NM_000059.4	A2

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:8

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 2 Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA), c/o University of Cambridge	Oct 02, 2015	- -
Pathogenic, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA2)	May 19, 2004	- -
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. -

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Sep 15, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 23, 2015	This deletion of 4 nucleotides in BRCA2 is denoted c.6644_6647delACTC at the cDNA level and p.Tyr2215SerfsX13 (Y2215SfsX13) at the protein level. The normal sequence, with the bases that are deleted in braces, is ACTTA[ACTC]CAAA. The deletion causes a frameshift, which changes a Tyrosine to a Serine at codon 2215, and creates a premature stop codon at position 13 of the new reading frame. This variant is predicted to cause loss of normal protein function through either protein truncation or nonsense-mediated mRNA decay. BRCA2 c.6644_6647delACTC, previously reported as BRCA2 6671delCT, has been observed in Danish hereditary breast ovarian cancer families as well as in an individual with breast cancer (Thomassen 2008, Borg 2010). we consider this variant to be pathogenic. -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Feb 22, 2022	This variant deletes 2 nucleotides in exon 11 of the BRCA2 gene, creating a frameshift and premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant is also known as 6671delCT based on Breast Cancer Information Core (BIC) nomenclature. This variant has been reported in an individual affected with breast cancer (PMID: 20104584) and in high-risk hereditary breast and ovarian cancer individuals and families (PMID: 18465347, 29907814). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Loss of BRCA2 function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Feb 08, 2024	The c.6443_6444delCT pathogenic mutation, located in coding exon 10 of the BRCA2 gene, results from a deletion of two nucleotides at nucleotide positions 6443 to 6444, causing a translational frameshift with a predicted alternate stop codon (p.S2148Yfs*2). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). This variant has been identified in patients with personal and/or family histories of breast and/or ovarian cancer (Thomassen M et al. Acta Oncol, 2008;47:772-7; Borg A et al. Hum Mutat, 2010 Mar;31:E1200-40; Yao L et al. J Hum Genet, 2022 Nov;67:639-642). 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

Invitae

Aug 14, 2023

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 52097). This variant is also known as 6671delCT. This premature translational stop signal has been observed in individual(s) with breast and/or ovarian cancer (PMID: 20104584, 29907814). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Ser2148Tyrfs*2) in the BRCA2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in BRCA2 are known to be pathogenic (PMID: 20104584). -

Computational scores

Source: dbNSFP v4.3

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: rs80359589; hg19: chr13-32914932;