chr13-32326796-T-A

Position:

• chr13-32326796-T-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_000059.4(BRCA2):​c.631+183T>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.334 in 151,724 control chromosomes in the GnomAD database, including 8,620 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

• Frequency: Genomes: 𝑓 0.33 (8620 hom., cov: 32)
• Consequence: BRCA2 NM_000059.4 intron
• Clinical Significance: Benign reviewed by expert panel B:7
• Conservation: PhyloP100: 0.0330

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 Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BP6: Variant 13-32326796-T-A is Benign according to our data. Variant chr13-32326796-T-A is described in ClinVar as [Benign]. Clinvar id is 209652.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr13-32326796-T-A is described in Lovd as [Benign].
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.483 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.631+183T>A		intron_variant		ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.631+183T>A		intron_variant		5	NM_000059.4	ENSP00000369497	A2

Frequencies

GnomAD3 genomes AF: 0.334 AC: 50638 AN: 151606 Hom.: 8620 Cov.: 32

Gnomad AFR AF: 0.284

Gnomad AMI AF: 0.205

Gnomad AMR AF: 0.325

Gnomad ASJ AF: 0.351

Gnomad EAS AF: 0.500

Gnomad SAS AF: 0.411

Gnomad FIN AF: 0.332

Gnomad MID AF: 0.344

Gnomad NFE AF: 0.350

Gnomad OTH AF: 0.330

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.334 AC: 50653 AN: 151724 Hom.: 8620 Cov.: 32 AF XY: 0.338 AC XY: 25036 AN XY: 74172

Gnomad4 AFR AF: 0.284

Gnomad4 AMR AF: 0.326

Gnomad4 ASJ AF: 0.351

Gnomad4 EAS AF: 0.499

Gnomad4 SAS AF: 0.409

Gnomad4 FIN AF: 0.332

Gnomad4 NFE AF: 0.350

Gnomad4 OTH AF: 0.328

Alfa AF: 0.344 Hom.: 1140

Bravo AF: 0.325

Asia WGS AF: 0.392 AC: 1364 AN: 3474

ClinVar

Significance: Benign

Submissions summary: Benign:7

Revision: reviewed by expert panel

Submissions by phenotype

not specified Benign:3

Benign, no assertion criteria provided	clinical testing	Clinical Genetics Laboratory, Department of Pathology, Netherlands Cancer Institute	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneKor MSA	Nov 01, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	- -

Breast-ovarian cancer, familial, susceptibility to, 2 Benign:2

Benign, reviewed by expert panel	curation	Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)	Jan 12, 2015	Class 1 not pathogenic based on frequency >1% in an outbred sampleset. Frequency 0.4895 (Asian), 0.1992 (African), 0.3298 (European), derived from 1000 genomes (2012-04-30). -
Benign, criteria provided, single submitter	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	Oct 09, 2014	- -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	Jun 23, 2018	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	1.9
DANN	Benign	0.67

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: rs3752451; hg19: chr13-32900933;