rs201392123

Positions:

• chr13-32371231-T-TC

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP6_Very_Strong BS1 BS2

The NM_000059.4(BRCA2):​c.8632+132dup variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0017 in 918,952 control chromosomes in the GnomAD database, including 13 homozygotes. Variant has been reported in ClinVar as Benign (★★★).

• Frequency:
  • Genomes: 𝑓 0.0069 (10 hom., cov: 32)
  • Exomes 𝑓: 0.00066 (3 hom.)
• Consequence: BRCA2 NM_000059.4 intron
• Clinical Significance: Benign reviewed by expert panel B:5
• Conservation: PhyloP100: -0.596

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 -16 ACMG points.

• BP6: Variant 13-32371231-T-TC is Benign according to our data. Variant chr13-32371231-T-TC is described in ClinVar as [Benign]. Clinvar id is 209815.Status of the report is reviewed_by_expert_panel, 3 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00691 (1052/152270) while in subpopulation AFR AF= 0.0242 (1006/41556). AF 95% confidence interval is 0.023. There are 10 homozygotes in gnomad4. There are 488 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 10 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA2	NM_000059.4	c.8632+132dup		intron_variant		ENST00000380152.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA2	ENST00000380152.8	c.8632+132dup		intron_variant		5	NM_000059.4	A2

Frequencies

GnomAD3 genomes AF: 0.00690 AC: 1050 AN: 152152 Hom.: 9 Cov.: 32

Gnomad AFR AF: 0.0242

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00216

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00430

GnomAD4 exome AF: 0.000661 AC: 507 AN: 766682 Hom.: 3 AF XY: 0.000528 AC XY: 208 AN XY: 393676

Gnomad4 AFR exome AF: 0.0226

Gnomad4 AMR exome AF: 0.00169

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000310

Gnomad4 OTH exome AF: 0.00144

GnomAD4 genome AF: 0.00691 AC: 1052 AN: 152270 Hom.: 10 Cov.: 32 AF XY: 0.00655 AC XY: 488 AN XY: 74464

Gnomad4 AFR AF: 0.0242

Gnomad4 AMR AF: 0.00216

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00426

Alfa AF: 0.000646 Hom.: 0

Bravo AF: 0.00791

Asia WGS AF: 0.00202 AC: 7 AN: 3470

ClinVar

Significance: Benign

Submissions summary: Benign:5

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	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	Oct 25, 2017	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -

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 0.05 (African), derived from 1000 genomes (2012-04-30). -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jan 09, 2021

- -

Computational scores

Source: dbNSFP v4.3

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: rs201392123; hg19: chr13-32945368;