chr13-32398608-C-CGAATTATATCT

Variant names:

• chr13-32398608-C-CGAATTATATCT
• rs730881599
• NM_000059.4:c.10095_10096insGAATTATATCT

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PVS1_Moderate BP6_Moderate

The NM_000059.4(BRCA2):​c.10095_10096insGAATTATATCT​(p.Ser3366GlufsTer21) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA2 NM_000059.4 frameshift
• Clinical Significance: Likely benign criteria provided, single submitter U:1 B:1
• Conservation: PhyloP100: -0.584
• 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: Uncertain_significance. The variant received 0 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. Fraction of 0.0157 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• BP6: Variant 13-32398608-C-CGAATTATATCT is Benign according to our data. Variant chr13-32398608-C-CGAATTATATCT is described in ClinVar as Likely_benign. ClinVar VariationId is 182305.Status of the report is criteria_provided_single_submitter, 1 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.10095_10096insGAATTATATCT	p.Ser3366GlufsTer21	frameshift	Exon 27 of 27	NP_000050.3
	BRCA2	NM_001432077.1		c.10095_10096insGAATTATATCT	p.Ser3366GlufsTer21	frameshift	Exon 27 of 27	NP_001419006.1
	BRCA2	NM_001406720.1		c.10044_10045insGAATTATATCT	p.Ser3349GlufsTer21	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.10095_10096insGAATTATATCT	p.Ser3366GlufsTer21	frameshift	Exon 27 of 27	ENSP00000369497.3
	BRCA2	ENST00000544455.6	TSL:1	c.10095_10096insGAATTATATCT	p.Ser3366GlufsTer21	frameshift	Exon 27 of 27	ENSP00000439902.1
	BRCA2	ENST00000530893.7	TSL:1	c.9726_9727insGAATTATATCT	p.Ser3243GlufsTer21	frameshift	Exon 27 of 27	ENSP00000499438.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Breast-ovarian cancer, familial, susceptibility to, 2 (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.58

Splicing

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

Other links and lift over

dbSNP: rs730881599; hg19: chr13-32972745;