rs79483201

chr13-32332421-T-Achr13-32332421-T-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BP6_Very_Strong

The NM_000059.4(BRCA2):c.943T>A(p.Cys315Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000886 in 1,591,398 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C315F) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00017 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000080 (0 hom.)
• Consequence: BRCA2 NM_000059.4 missense
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts U:1 B:23
• Conservation: PhyloP100: 0.443

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 -12 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.0065433383).
• BP6: Variant 13-32332421-T-A is Benign according to our data. Variant chr13-32332421-T-A is described in ClinVar as [Likely_benign]. Clinvar id is 38241.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr13-32332421-T-A is described in Lovd as [Likely_benign]. Variant chr13-32332421-T-A is described in Lovd as [Benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA2	NM_000059.4	c.943T>A	p.Cys315Ser	missense_variant	10/27	ENST00000380152.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA2	ENST00000380152.8	c.943T>A	p.Cys315Ser	missense_variant	10/27	5	NM_000059.4	A2

Frequencies

GnomAD3 genomes AF: 0.000177 AC: 27 AN: 152160 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00519

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000412 AC: 96 AN: 232852 Hom.: 0 AF XY: 0.000342 AC XY: 43 AN XY: 125832

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00539

Gnomad SAS exome AF: 0.0000773

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000180

GnomAD4 exome AF: 0.0000799 AC: 115 AN: 1439120 Hom.: 0 Cov.: 31 AF XY: 0.0000727 AC XY: 52 AN XY: 715222

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00265

Gnomad4 SAS exome AF: 0.0000370

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.06e-7

Gnomad4 OTH exome AF: 0.000101

GnomAD4 genome AF: 0.000171 AC: 26 AN: 152278 Hom.: 0 Cov.: 32 AF XY: 0.000201 AC XY: 15 AN XY: 74454

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00501

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000629 Hom.: 0

Bravo AF: 0.000189

ExAC AF: 0.000371 AC: 45

Asia WGS AF: 0.00115 AC: 4 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Uncertain:1 Benign:23

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:7

Benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Nov 04, 2022	- -
Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics Laboratory, Department of Pathology, Netherlands Cancer Institute	-	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2018	- -
Likely benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Likely benign, no assertion criteria provided	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	The BRCA2 p.Cys315Ser variant was identified in 1 of 74 proband chromosomes (frequency: 0.014) from individuals or families with hereditary breast and ovarian cancer (Toh 2008) and in 4 of 534 proband chromosomes (frequency: 0.007) from individuals or families with esophageal cancer (Akbari 2008, Hu 2004). The variant was also identified in dbSNP (ID: rs79483201) as “other,” Clinvitae database (with conflicting interpretations by multiple submitters the ClinVar database (1X as “benign,” 3X as “likely benign,” and 2X as “uncertain significance”), the BIC database (15X with unknown clinical importance), and UMD (14X as ”unclassified variant”). The variant was not found in the Fanconi Anemia Mutation Database (LOVD), LOVD-IARC database, ARUP Laboratories BRCA Mutations Database, COSMIC, or GeneInsight COGR databases. This variant was identified in the 1000 Genomes Project in 8 of 5000 chromosomes (frequency: 0.0016) and in the Exome Aggregation Consortium database (March 14, 2016) in 45 of 120310 chromosomes (freq. 0.0004) in the following populations: East Asian in 44 of 8626 chromosomes (freq. 0.005), South Asian in 1 of 16236 chromosomes (freq. 0.000006), but was not seen in African, Finnish, European (Non-Finnish), and Latino populations, increasing the likelihood this could be a low frequency benign variant. The p.Cys315 residue is not conserved in mammals and four out of five computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) do not suggest a high likelihood of impact to the protein; however, this information is not predictive enough to rule out pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) do not predict a difference in splicing at the known exon/intron boundary however 3 out of 5 programs suggest a change in a 3’ cryptic splice site. Akbari (2008) classified the variant as deleterious because it is located in the region implicated in the BRCA2-P/CAF complex formation. Hu (2004) classified the variant as uncertain significance because although the variant showed segregation in the families studied, they could not demonstrate co-segregation with disease. In addition, this variant was previously identified by our laboratory in an individual as co-occurring with a pathogenic BRCA2 variant c.8961_8964delGAGT increasing the likelihood that the p.Cys315Ser variant does not have clinical significance. In summary, based on the above information, the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as likely benign. -

Breast-ovarian cancer, familial, susceptibility to, 2 Uncertain:1 Benign:5

Likely benign, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Feb 05, 2024	- -
Uncertain significance, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA2)	May 29, 2002	- -
Likely benign, criteria provided, single submitter	clinical testing	Michigan Medical Genetics Laboratories, University of Michigan	Apr 21, 2016	- -
Likely benign, criteria provided, single submitter	literature only	Counsyl	Jul 17, 2014	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Sep 30, 2019	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). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -
Likely benign, no assertion criteria provided	clinical testing	BRCAlab, Lund University	Mar 02, 2020	- -

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	May 03, 2019	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Jun 21, 2016	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, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Sep 25, 2020	Variant summary: BRCA2 c.943T>A (p.Cys315Ser) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0005 in 238344 control chromosomes, predominantly at a frequency of 0.0054 within the East Asian subpopulation in the gnomAD database. The observed variant frequency within East Asian control individuals in the gnomAD database is approximately 7 fold of the estimated maximal expected allele frequency for a pathogenic variant in BRCA2 causing Hereditary Breast And Ovarian Cancer Syndrome phenotype (0.00075), strongly suggesting that the variant is a benign polymorphism found primarily in populations of East Asian origin. c.943T>A has been reported in the literature in sequencing studies of individuals affected with Hereditary Breast and Ovarian Cancer, but it was also present in several healthy controls at the same time (e.g. Ahmad 2012, Haiman 2013, Suter 2004). Moreover, recent case-control studies performed on South-East Asian cohorts indicated that the variant of interest was found with similar frequencies in breast cancer patients and healthy controls (Lai 2017, Yoon 2016). These report(s) do not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. Numerous reported co-occurrences with other pathogenic variant(s) have been reported in the BIC and UMD databases (captured verbatim from the database records, BIC - BRCA2 c.5946_5946delT, p.Ser1982Argfs; BRCA1 c.1687C>T, p.Gln563Ter; BRCA1 c.4035_4035delA, p.Glu1345=fs; BRCA1 c.5263_5264insC, p.Ser1755?fs; BRCA1 c.4148C>G, p.Ser1383Ter; UMD - BRCA1 c.3810C>A, p.Cys1270Ter), providing supporting evidence for a benign role. No experimental evidence demonstrating an impact on protein function was ascertained in the context of this classification. Eleven clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as benign (n=4)/likely benign (n=7). Some submitters cite overlapping evidences utilized in the context of this evaluation. Based on the evidence outlined above, the variant was classified as benign. -

Hereditary cancer-predisposing syndrome Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jun 01, 2015	- -
Benign, criteria provided, single submitter	curation	Sema4, Sema4	Dec 25, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	May 08, 2015	This alteration is classified as 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. -

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

Feb 10, 2021

- -

Fanconi anemia complementation group D1 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

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 allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

BRCA2-related disorder Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 22, 2023

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

Likely benign, no assertion criteria provided

literature only

Center for Precision Medicine, Meizhou People's Hospital

-

- -

Hereditary breast ovarian cancer syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.45	T
BayesDel_noAF	Benign	-0.41
Cadd	Benign	4.3
Dann	Benign	0.35
Eigen	Benign	-0.90
Eigen_PC	Benign	-0.91
FATHMM_MKL	Benign	0.030	N
M_CAP	Uncertain	0.15	D
MetaRNN	Benign	0.0065	T;T
MetaSVM	Benign	-0.91	T
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.64	N;N
REVEL	Benign	0.18
Sift	Benign	0.30	T;T
Sift4G	Benign	0.43	T;T
Vest4		0.28
MutPred		0.30		Gain of catalytic residue at C315 (P = 0.0138);Gain of catalytic residue at C315 (P = 0.0138);
MVP		0.84
MPC		0.032
ClinPred		0.021	T
GERP RS		1.8
gMVP		0.081

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: rs79483201; hg19: chr13-32906558;