NM_000059.4:c.9808delG

Variant names:

• chr13-32398320-AG-A
• rs398122622
• NM_000059.4:c.9808delG

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000059.4(BRCA2):​c.9808delG​(p.Ala3270ProfsTer5) variant causes a frameshift change. The variant allele was found at a frequency of 0.000000684 in 1,461,880 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★★). Synonymous variant affecting the same amino acid position (i.e. A3270A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: BRCA2 NM_000059.4 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:8
• Conservation: PhyloP100: 5.09
• Publications: 5 publications found

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 Gene-Disease associations (from GenCC):

• breast-ovarian cancer, familial, susceptibility to, 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), ClinGen
• Fanconi anemia complementation group D1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, G2P
• pancreatic cancer, susceptibility to, 2

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• sarcoma

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• hereditary breast ovarian cancer syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Fanconi anemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• medulloblastoma

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 23 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 13-32398320-AG-A is Pathogenic according to our data. Variant chr13-32398320-AG-A is described in ClinVar as Pathogenic. ClinVar VariationId is 91534.Status of the report is reviewed_by_expert_panel, 3 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000059.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BRCA2	NM_000059.4	MANE Select	c.9808delG	p.Ala3270ProfsTer5	frameshift	Exon 27 of 27	NP_000050.3
	BRCA2	NM_001432077.1		c.9808delG	p.Ala3270ProfsTer5	frameshift	Exon 27 of 27	NP_001419006.1
	BRCA2	NM_001406720.1		c.9757delG	p.Ala3253ProfsTer5	frameshift	Exon 27 of 27	NP_001393649.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BRCA2	ENST00000380152.8	TSL:5 MANE Select	c.9808delG	p.Ala3270ProfsTer5	frameshift	Exon 27 of 27	ENSP00000369497.3
	BRCA2	ENST00000544455.6	TSL:1	c.9808delG	p.Ala3270ProfsTer5	frameshift	Exon 27 of 27	ENSP00000439902.1
	BRCA2	ENST00000530893.7	TSL:1	c.9439delG	p.Ala3147ProfsTer5	frameshift	Exon 27 of 27	ENSP00000499438.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251388 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

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: 1461880 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727242

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.0000224 AC: 1 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112006

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:8

Revision: reviewed by expert panel

Submissions by phenotype

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

Sep 08, 2016

Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)

Significance: Pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

Variant allele predicted to encode a truncated non-functional protein.

Oct 02, 2015

Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA), c/o University of Cambridge

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Oct 02, 2012

Sharing Clinical Reports Project (SCRP)

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

Hereditary cancer-predisposing syndrome Pathogenic:2

Jul 16, 2019

Color Diagnostics, LLC DBA Color Health

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant deletes 1 nucleotide in exon 27 of the BRCA2 gene, creating a frameshift and premature translation stop signal in the last coding exon. This mutant transcript is predicted to escape nonsense-mediated decay and be expressed as a truncated protein. Although functional studies have not been performed, this variant is expected to disrupt the RAD51 binding domain. This domain has been reported to be essential for homologous recombination and DNA repair (PMID: 17515903). In addition, truncating variants occurring downstream of this variant are known to be disease-causing (ClinVar variation ID: 52916, 267176). To our knowledge, this variant has not been reported in individuals affected with hereditary cancer in the literature. This variant has been identified in 1/251388 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Based on the available evidence, this variant is classified as Likely Pathogenic.

Aug 05, 2022

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.9808delG (also known as 10036delG) pathogenic mutation, located in coding exon 26 of the BRCA2 gene, results from a deletion of one nucleotide at nucleotide position 9808, causing a translational frameshift with a predicted alternate stop codon. This alteration occurs at the 3' terminus of theBRCA2 gene, is not expected to trigger nonsense-mediated mRNA decay, and only impacts the last 149 amino acids of the protein. However, premature stop codons are typically deleterious in nature and the impacted region is critical for protein function (Ambry internal data). Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation.

Hereditary breast ovarian cancer syndrome Pathogenic:2

Sep 09, 2019

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: BRCA2 c.9808delG (p.Ala3270ProfsX5) 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. A truncation downstream of this position has been classified as pathogenic by our laboratory. The variant allele was found at a frequency of 4e-06 in 251388 control chromosomes (gnomAD). c.9808delG has been reported in the literature in individuals affected with Hereditary Breast and Ovarian Cancer (Rebbeck_2018, Feliubadalo_2019). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four ClinVar submissions (evaluation after 2014, including one expert panel-ENIGMA) cite the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic.

Jul 15, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. A different truncation (p.Tyr3308*) that lies downstream of this variant has been determined to be pathogenic (PMID: 17026620, 22711857, 18593900, 18607349). This suggests that deletion of this region of the BRCA2 protein is causative of disease. This variant has been reported in individuals in the Leiden Open-source Variation Database (PMID: 21520333). ClinVar contains an entry for this variant (Variation ID: 91534). This variant is not present in population databases (ExAC no frequency). This sequence change results in a premature translational stop signal in the BRCA2 gene (p.Ala3270Profs*5). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 149 amino acids of the BRCA2 protein.

not provided Pathogenic:1

Sep 23, 2019

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Frameshift variant in the C-terminus predicted to result in protein truncation, as the last 149 amino acids are lost and replaced with 4 incorrect amino acids; Considered pathogenic by a well-established clinical consortium and/or database (ClinVar SCV000301415.2); Not observed at a significant frequency in large population cohorts (Lek 2016); Has not been previously published to our knowledge; This variant is associated with the following publications: (PMID: 29922827, 22144684)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		5.1
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs398122622; hg19: chr13-32972457;