rs28897762

Positions:

• chr13-32398623-G-A
• chr13-32398623-G-C
• chr13-32398623-G-T

Variant summary

Our verdict is Benign. Variant got -17 ACMG points: 0P and 17B. BP4_Strong BP6_Very_Strong BP7 BS2

The NM_000059.4(BRCA2):​c.10110G>A​(p.Arg3370=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00173 in 1,614,080 control chromosomes in the GnomAD database, including 9 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

• Frequency:
  • Genomes: 𝑓 0.0013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0018 (9 hom.)
• Consequence: BRCA2 NM_000059.4 synonymous
• Clinical Significance: Benign reviewed by expert panel U:2 B:31
• Conservation: PhyloP100: 0.137

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 -17 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).
• BP6: Variant 13-32398623-G-A is Benign according to our data. Variant chr13-32398623-G-A is described in ClinVar as [Benign]. Clinvar id is 51043.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr13-32398623-G-A is described in Lovd as [Benign]. Variant chr13-32398623-G-A is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=0.137 with no splicing effect.
• BS2: High Homozygotes in GnomAdExome4 at 9 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.10110G>A	p.Arg3370=	synonymous_variant	27/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.10110G>A	p.Arg3370=	synonymous_variant	27/27	5	NM_000059.4	ENSP00000369497	A2

Frequencies

GnomAD3 genomes AF: 0.00127 AC: 193 AN: 152152 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000386

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000327

Gnomad ASJ AF: 0.00288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00104

Gnomad FIN AF: 0.00160

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00204

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.00140 AC: 352 AN: 251248 Hom.: 0 AF XY: 0.00147 AC XY: 199 AN XY: 135788

Gnomad AFR exome AF: 0.000123

Gnomad AMR exome AF: 0.000723

Gnomad ASJ exome AF: 0.00149

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.00157

Gnomad FIN exome AF: 0.00217

Gnomad NFE exome AF: 0.00182

Gnomad OTH exome AF: 0.00114

GnomAD4 exome AF: 0.00178 AC: 2595 AN: 1461810 Hom.: 9 Cov.: 31 AF XY: 0.00181 AC XY: 1319 AN XY: 727202

Gnomad4 AFR exome AF: 0.000119

Gnomad4 AMR exome AF: 0.000850

Gnomad4 ASJ exome AF: 0.00203

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.00216

Gnomad4 FIN exome AF: 0.00249

Gnomad4 NFE exome AF: 0.00186

Gnomad4 OTH exome AF: 0.00180

GnomAD4 genome AF: 0.00127 AC: 193 AN: 152270 Hom.: 0 Cov.: 32 AF XY: 0.00122 AC XY: 91 AN XY: 74454

Gnomad4 AFR AF: 0.000385

Gnomad4 AMR AF: 0.000327

Gnomad4 ASJ AF: 0.00288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00104

Gnomad4 FIN AF: 0.00160

Gnomad4 NFE AF: 0.00204

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.00150 Hom.: 0

Bravo AF: 0.00107

Asia WGS AF: 0.000866 AC: 3 AN: 3478

EpiCase AF: 0.00202

EpiControl AF: 0.00142

ClinVar

Significance: Benign

Submissions summary: Uncertain:2 Benign:31

Revision: reviewed by expert panel

Submissions by phenotype

not specified Benign:9

Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 16, 2013	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics Laboratory, Department of Pathology, Netherlands Cancer Institute	-	- -
Benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	May 25, 2021	- -
Benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	May 15, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Cancer Genetics and Genomics Laboratory, British Columbia Cancer Agency	Apr 18, 2017	- -
Benign, no assertion criteria provided	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	BRCA2, c.10110G>A, p.Arg3370Arg, Predicted Benign. This variant is not expected to have clinical significance because it does not alter an amino acid residue, is not located near a splice junction, is listed in dbSNP (rs28897762) from a clinical source with an average heterozygosity and standard error of 0.004+/-0.047, and was also detected, with similar frequencies, in various ethnic mutation screening studies without any information to assess the significance of this variant (Bergthorsson_2001_11389159, Campos_2001_11843247, Diez_2003_12955716, Edwards_2003_12474142, Claes_2004_15026808, Infante_2006_16758124, Borg_2010_20104584, Stegel_2011_21232165). In addition, this variant is listed in the UMD mutation database to co-occur with a pathogenic mutation in BRCA1 (c.5330T>A/p.Tyr1769X), increasing the likelihood that p.Arg3370Arg is benign. Further, Myriad calls this a polymorphism (personal communication). In summary, based on the above information, the p.Arg3370Arg variant is predicted to be benign. -

Breast-ovarian cancer, familial, susceptibility to, 2 Uncertain:1 Benign:7

Uncertain significance, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA2)	Jun 12, 2000	- -
Benign, criteria provided, single submitter	clinical testing	Michigan Medical Genetics Laboratories, University of Michigan	Nov 03, 2014	- -
Benign, criteria provided, single submitter	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	Sep 21, 2015	- -
Benign, reviewed by expert panel	curation	Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)	Jun 29, 2017	Synonymous substitution variant, with low bioinformatic likelihood to alter mRNA splicing (splicing prior 0.02; http://priors.hci.utah.edu/PRIORS/) and frequency 0.002 (Non-Finnish European), 0.0018 (Finnish), 0.0014 (South Asian), derived from ExAC (2014-12-17). -
Benign, criteria provided, single submitter	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	Oct 10, 2014	- -
Likely benign, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -
Benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Benign, criteria provided, single submitter	clinical testing	KCCC/NGS Laboratory, Kuwait Cancer Control Center	Jul 07, 2023	- -

Hereditary breast ovarian cancer syndrome Benign:5

Likely benign, criteria provided, single submitter	research	Genetics Program, Instituto Nacional de Cancer	Nov 01, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	National Health Laboratory Service, Universitas Academic Hospital and University of the Free State	Nov 16, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 01, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jun 14, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jan 27, 2014	- -

Hereditary cancer-predisposing syndrome Benign:4

Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Jun 27, 2014	This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
Benign, criteria provided, single submitter	curation	Sema4, Sema4	Oct 16, 2020	- -
Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Apr 13, 2015	- -
Likely benign, no assertion criteria provided	clinical testing	True Health Diagnostics	Oct 10, 2017	- -

not provided Benign:3

Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jun 22, 2022	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Aug 01, 2024	BRCA2: BP4, BP7 -
Likely benign, no assertion criteria provided	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	May 15, 2017	- -

Fanconi anemia complementation group D1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Breast and/or ovarian cancer Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Apr 14, 2023

- -

BRCA2-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 22, 2024

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Familial cancer of breast Benign:1

Benign, criteria provided, single submitter

clinical testing

Baylor Genetics

Feb 23, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	0.84
DANN	Benign	0.63

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: rs28897762; hg19: chr13-32972760; COSMIC: COSV104700964; COSMIC: COSV104700964;