13-32330932-AT-A

Position:

• chr13-32330932-AT-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000059.4(BRCA2):​c.700del​(p.Ser234ProfsTer7) variant causes a frameshift 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 (★★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA2 NM_000059.4 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:13
• Conservation: PhyloP100: 1.36

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 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 13-32330932-AT-A is Pathogenic according to our data. Variant chr13-32330932-AT-A is described in ClinVar as [Pathogenic]. Clinvar id is 38079.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr13-32330932-AT-A is described in Lovd as [Pathogenic]. Variant chr13-32330932-AT-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.700del	p.Ser234ProfsTer7	frameshift_variant	9/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.700del	p.Ser234ProfsTer7	frameshift_variant	9/27	5	NM_000059.4	ENSP00000369497	A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:13

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 2 Pathogenic:5

Pathogenic, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Aug 16, 2011	- -
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, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Mar 27, 2015	- -
Pathogenic, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA2)	Feb 20, 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. -

Hereditary breast ovarian cancer syndrome Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 13, 2023	This sequence change creates a premature translational stop signal (p.Ser234Profs*7) 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). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with a personal and/or family history of breast and/or ovarian cancer (PMID: 11938448, 19656164, 22762150, 22798144, 26843898). This variant is also known as 924delT or 928delT. ClinVar contains an entry for this variant (Variation ID: 38079). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Oct 07, 2019	Variant summary: BRCA2 c.700delT (p.Ser234ProfsX7) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant was absent in 250024 control chromosomes (gnomAD). c.700delT has been reported in the literature in several individuals affected with Hereditary Breast and Ovarian Cancer (e.g. Nedelcu_2002, Giannini_2006, Seong_2009, Kluska_2015). These data indicate that the variant is likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Eight other submitters, including one expert panel (ENIGMA) have provided clinical-significance assessments for this variant in ClinVar after 2014, and all of them classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, no assertion criteria provided	research	Research Molecular Genetics Laboratory, Women's College Hospital, University of Toronto	Jan 31, 2014	- -

not provided Pathogenic:2

Pathogenic, no assertion criteria provided	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	The p.Ser234ProfsX7 deletion variant was identified in 4 of 6352 proband chromosomes (frequency: 0.001) from individuals or families with breast or ovarian cancer (Capalbo 2006, Kim 2012, Meindl 2002, Nedelcu 2002). The variant was also identified in dbSNP (ID: rs80359630) “With Pathogenic allele”, HGMD, ClinVar database, the BIC database (3X with clinical importance), and UMD (6X as a causal variant). The variant was classified as a pathogenic variant by the Sharing Clinical Reports Project (SCRP) (submitted within the ClinVar database and derived from Myriad reports). The p.Ser234ProfsX7 deletion variant is predicted to cause a frameshift, which alters the protein's amino acid sequence beginning at codon 234 and leads to a premature stop codon 7 codons downstream. This alteration is then predicted to result in a truncated or absent protein and loss of function. Loss of function variants of the BRCA2 gene are an established mechanism of disease in hereditary breast and ovarian cancer and is the type of variant expected to cause the disorder. In summary, based on the above information, this variant meets our laboratory’s criteria to be classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Dec 03, 2019	Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed in large population cohorts (Lek 2016); Truncating variants in this gene are considered pathogenic by a well-established clinical consortium and/or database; Observed in individuals with BRCA2-related cancers (Nedelcu 2002, Lubinski 2004, Giannini 2006, Sinilnikova 2006, Seong 2009, Kim 2012, Germani 2018; Also known as 924delT and 928delT; This variant is associated with the following publications: (PMID: 15131399, 11938448, 16847550, 16528604, 26843898, 22798144, 19656164, 25948282, 22762150, 30263092, 31921681) -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Nov 02, 2021	This variant deletes 1 nucleotide in exon 9 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 has been reported in at least six individuals affected with breast cancer and in additional suspected hereditary breast and ovarian cancer families (PMID: 11802209, 11938448, 16760289, 19656164, 22762150, 26843898). 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	Mar 31, 2022	The c.700delT pathogenic mutation, located in coding exon 8 of the BRCA2 gene, results from a deletion of one nucleotide at nucleotide position 700, causing a translational frameshift with a predicted alternate stop codon. This mutation has been previously identified in Italian, German, and Korean breast/ovarian cancer cohorts (Meindl A et al. Int. J. Cancer, 2002 Feb;97:472-80; Capalbo C et al. Ann. Oncol., 2006 Jun;17 Suppl 7:vii34-40; Seong MW et al. Clin. Genet., 2009 Aug;76:152-60). Of note, this alteration has also been designated as 928delT in the published literature. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). 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. -

Breast and/or ovarian cancer Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Foulkes Cancer Genetics LDI, Lady Davis Institute for Medical Research

Jan 15, 2016

- -

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: rs80359630; hg19: chr13-32905069;