13-32340432-CAAGAG-C

Position:

• chr13-32340432-CAAGAG-C

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.6082_6086delGAAGA​(p.Glu2028fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,534 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: BRCA2 NM_000059.4 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:22
• Conservation: PhyloP100: 0.863

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 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 13-32340432-CAAGAG-C is Pathogenic according to our data. Variant chr13-32340432-CAAGAG-C is described in ClinVar as [Pathogenic]. Clinvar id is 52007.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr13-32340432-CAAGAG-C is described in Lovd as [Pathogenic]. Variant chr13-32340432-CAAGAG-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.6082_6086delGAAGA	p.Glu2028fs	frameshift_variant	11/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.6082_6086delGAAGA	p.Glu2028fs	frameshift_variant	11/27	5	NM_000059.4	ENSP00000369497.3
BRCA2	ENST00000530893.7	c.5713_5717delGAAGA	p.Glu1905fs	frameshift_variant	11/27	1		ENSP00000499438.2
BRCA2	ENST00000614259.2	n.6082_6086delGAAGA		non_coding_transcript_exon_variant	10/26	2		ENSP00000506251.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 250972 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135698

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461534 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 727080

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:22

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 2 Pathogenic:8

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)	Jun 22, 1999	- -
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, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Sep 29, 2009	- -
Pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Dec 11, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Neuberg Centre For Genomic Medicine, NCGM	Mar 01, 2023	The frameshift c.6082_6086del (p.Glu2028LysfsTer19) variant in the BRCA2 gene has been reported previously in heterozygous state in multiple individuals affected with breast and ovarian cancer (Bergthorsson, J T et al., 2001). This variant is reported with the allele frequency (0.0003%) in the gnomAD Exomes and novel in 1000 Genomes. It is submitted to ClinVar as Pathogenic (multiple submissions). This variant causes a frameshift starting at codon 2028 where Glutamic acid changes to Lysine residue, and creates a premature Stop codon at position 19 of the new reading frame, denoted p.Glu2028LysfsTer19. This variant is predicted to cause loss of normal protein function through protein truncation. Loss of function variants have been previously reported to be disease causing. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Sep 18, 2023	This variant deletes 5 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 has been reported in at least eight individuals affected with breast and ovarian cancer (PMID: 11389159, 26028024, 26360800, 26541979, 26681312, 26733283, 28993434, 29470806, 30720863). This variant has been identified in 1/250972 chromosomes 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	Department of Clinical Genetics, Copenhagen University Hospital, Rigshospitalet	May 27, 2024	PVS1; PM5_PTC_Strong -

not provided Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 05, 2024	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 at significant frequency in large population cohorts (gnomAD); Truncating variants in this gene are considered pathogenic by a well-established clinical consortium and/or database; Also known as 6310_6314del; This variant is associated with the following publications: (PMID: 32854451, 11389159, 26360800, 30720243, 29470806, 30720863, 28993434, 31263571, 34326862, 21120943, 26733283, 26681312, 26028024, 26541979, 35464868, 37445679, 37197323, 37528630, 35411189) -
Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Dec 13, 2023	The BRCA2 c.6082_6086del (p.Glu2028Lysfs*19) variant alters the translational reading frame of the BRCA2 mRNA and causes the premature termination of BRCA2 protein synthesis. This variant has been reported in the published literature in individuals affected with breast and/or ovarian cancer (PMIDs: 32380732 (2020), 30720863 (2019), 26541979 (2016), 26681312 (2015), 11389159 (2001)). The frequency of this variant in the general population, 0.000004 (1/250972 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is consistent with pathogenicity. Based on the available information, this variant is classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Jul 31, 2024	- -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Aug 04, 2022	- -

Hereditary breast ovarian cancer syndrome Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Oct 07, 2024	Variant summary: BRCA2 c.6082_6086delGAAGA (p.Glu2028LysfsX19) 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 allele was found at a frequency of 4e-06 in 250972 control chromosomes. c.6082_6086delGAAGA has been reported in the literature in at-least one individual affected with bilateral breast cancer (example: Fanale_2020). The following publication has been ascertained in the context of this evaluation (PMID: 32854451). ClinVar contains an entry for this variant (Variation ID: 52007). Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	National Health Laboratory Service, Universitas Academic Hospital and University of the Free State	Nov 16, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 03, 2023	This sequence change creates a premature translational stop signal (p.Glu2028Lysfs*19) 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 present in population databases (rs758052728, gnomAD 0.003%). This premature translational stop signal has been observed in individual(s) with breast and/or ovarian cancer (PMID: 11389159, 21120943, 26028024, 26360800, 26541979, 26681312). This variant is also known as 6310del5. ClinVar contains an entry for this variant (Variation ID: 52007). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, no assertion criteria provided	research	Research Molecular Genetics Laboratory, Women's College Hospital, University of Toronto	Jan 31, 2014	- -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Apr 15, 2022	The c.6082_6086delGAAGA pathogenic mutation, located in coding exon 10 of the BRCA2 gene, results from a deletion of 5 nucleotides between positions 6082 and 6086, causing a translational frameshift with a predicted alternate stop codon (p.E2028Kfs*19). This mutation has been reported in multiple high risk breast or ovarian cancer patients, including a male breast cancer patient (Bergthorsson JT et al. J Med Genet. 2001 Jun;38(6):361-8; Golmard L et al. Oncogene. 2016 Mar 10;35(10):1324-7; Hasmad HN et al. Gynecol Oncol. 2016 May;141(2):318-22; Petersen AH et al. Eur J Hum Genet. 2016 Aug;24(8):1104-11; Roed Nielsen H et al. Acta Oncol. 2016;55(1):38-44; Wen WX et al. J. Med. Genet. 2018 Feb;55(2):97-103). Of note, this mutation is also designated as 6310del5 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. -
Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jun 14, 2023	This variant deletes 5 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 has been reported in at least eight individuals affected with breast and ovarian cancer (PMID: 11389159, 26028024, 26360800, 26541979, 26681312, 26733283, 28993434, 29470806, 30720863). This variant has been identified in 1/250972 chromosomes 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. -

Breast and/or ovarian cancer Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Foulkes Cancer Genetics LDI, Lady Davis Institute for Medical Research

Jun 02, 2014

- -

NICE approved PARP inhibitor treatment Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genomics and Molecular Medicine Service, East Genomic Laboratory Hub, NHS Genomic Medicine Service

May 09, 2024

PVS1,PS4_Moderate,PM2_Supporting -

Malignant tumor of breast Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The p.Glu2028LysfsX19 variant was identified in 1 of 238 proband chromosomes (frequency: 0.004) from Danish individuals or families with breast cancer, and was not identified in 360 control chromosomes from healthy individuals (Bergthorsson 2001); note, this study only looked at the tumours of affected individuals. The variant was also identified in dbSNP “With Pathogenic allele”, HGMD, LOVD, the BIC database (1X with clinical importance), and UMD (4X as a causal variant). The variant was classified as pathogenic by the Sharing Clinical Reports Project (SCRP) (submitted within the ClinVar database and derived from Myriad reports). The Glu2028LysfsX19 deletion variant is predicted to cause a frameshift, which alters the protein's amino acid sequence beginning at codon 2028 and leads to a premature stop codon 19 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. -

Familial cancer of breast Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Oct 04, 2023

- -

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: rs80359558; hg19: chr13-32914569;