13-32377317-C-T

Position:

• chr13-32377317-C-T

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.8754+526C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.189 in 152,054 control chromosomes in the GnomAD database, including 3,023 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

• Frequency: Genomes: 𝑓 0.19 (3023 hom., cov: 32)
• Consequence: BRCA2 NM_000059.4 intron
• Clinical Significance: Benign reviewed by expert panel B:2
• Conservation: PhyloP100: -0.764

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=-0.94).
• BP6: Variant 13-32377317-C-T is Benign according to our data. Variant chr13-32377317-C-T is described in ClinVar as [Benign]. Clinvar id is 209839.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr13-32377317-C-T is described in Lovd as [Benign].
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.381 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA2	NM_000059.4	c.8754+526C>T		intron_variant		ENST00000380152.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA2	ENST00000380152.8	c.8754+526C>T		intron_variant		5	NM_000059.4	A2

Frequencies

GnomAD3 genomes AF: 0.189 AC: 28774 AN: 151936 Hom.: 3025 Cov.: 32

Gnomad AFR AF: 0.107

Gnomad AMI AF: 0.127

Gnomad AMR AF: 0.172

Gnomad ASJ AF: 0.213

Gnomad EAS AF: 0.396

Gnomad SAS AF: 0.221

Gnomad FIN AF: 0.239

Gnomad MID AF: 0.237

Gnomad NFE AF: 0.217

Gnomad OTH AF: 0.206

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

GnomAD4 genome AF: 0.189 AC: 28766 AN: 152054 Hom.: 3023 Cov.: 32 AF XY: 0.194 AC XY: 14393 AN XY: 74318

Gnomad4 AFR AF: 0.107

Gnomad4 AMR AF: 0.172

Gnomad4 ASJ AF: 0.213

Gnomad4 EAS AF: 0.395

Gnomad4 SAS AF: 0.220

Gnomad4 FIN AF: 0.239

Gnomad4 NFE AF: 0.217

Gnomad4 OTH AF: 0.204

Alfa AF: 0.104 Hom.: 192

Bravo AF: 0.181

Asia WGS AF: 0.250 AC: 872 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 2 Benign:1

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 0.3864 (Asian), 0.04472 (African), 0.219 (European), derived from 1000 genomes (2012-04-30). -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Aug 24, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.94
CADD	Benign	2.0
DANN	Benign	0.55

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: rs9567623; hg19: chr13-32951454;