rs587781497

Positions:

• chr13-32379839-A-G

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 2P and 10B. PM2 BP4_Moderate BP6_Very_Strong

The NM_000059.4(BRCA2):​c.9043A>G​(p.Lys3015Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,418 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: BRCA2 NM_000059.4 missense
• Clinical Significance: Benign reviewed by expert panel U:3 B:5
• Conservation: PhyloP100: 0.708

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 -8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2429806).
• BP6: Variant 13-32379839-A-G is Benign according to our data. Variant chr13-32379839-A-G is described in ClinVar as [Benign]. Clinvar id is 141104.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.9043A>G	p.Lys3015Glu	missense_variant	23/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.9043A>G	p.Lys3015Glu	missense_variant	23/27	5	NM_000059.4	ENSP00000369497	A2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250458 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135392

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000885

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461418 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727016

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Benign

Submissions summary: Uncertain:3 Benign:5

Revision: reviewed by expert panel

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Jan 11, 2022	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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Nov 19, 2019	This missense variant replaces lysine with glutamic acid at codon 3015 of the BRCA2 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). Splice site prediction tools suggest that this variant may not impact RNA splicing. To our knowledge, functional studies have not been performed for this variant. This variant has been reported in a multifactorial analysis as benign based on co-occurrence and family history likelihood ratios (PMID: 31131967). This variant has also been reported in individual(s) who underwent BRCA genetic testing (PMID: 29310832). This variant has been identified in 1/250458 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

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

Benign, criteria provided, single submitter	clinical testing	Mendelics	Aug 22, 2023	- -
Benign, reviewed by expert panel	curation	Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)	Jun 18, 2019	IARC class based on posterior probability from multifactorial likelihood analysis, thresholds for class as per Plon et al. 2008 (PMID: 18951446). Class 1 based on posterior probability = 0.000831 -

Hereditary breast ovarian cancer syndrome Benign:2

Likely benign, criteria provided, single submitter	research	Genetics Program, Instituto Nacional de Cancer	Nov 01, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 03, 2023	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Nov 20, 2023

Variant summary: BRCA2 c.9043A>G (p.Lys3015Glu) results in a conservative amino acid change located in the OB3 domain (IPR015188) of the encoded protein sequence. Five of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 250458 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.9043A>G has been reported in the literature as a VUS or Likely benign change in a setting of multigene testing in at least two individuals affected with breast/ovarian cancer (e.g. Apessos_2018, Matta_2022). This report does not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. Several publications have used a variety of predictive models to classify the variant as part of the CAGI5 (fifth Critical Assessment of Genome Interpretation) ENIGMA Challenge. These models include a prediction protocol that incorporates several assessments of the impact of this variant on splicing and protein function (Padilla_2019), a multifactorial likelihood model which uses clinical data such as co-occurrences and co-segregation to predict pathogenicity (Parsons_2019), as well as a number of predictive models developed by six different teams which use a variety of methods including machine learning which consider structural and functional predictors often in addition to clinical data (Cline_2019). In each of these publications, the variant was given a classification of benign. However, these predictions have yet to confirmed with functional studies, as to our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 29310832, 31294896, 36329109, 31112341, 31131967). Seven submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. Multiple submitters reported the variant with conflicting assessments (VUS (n=2), benign (n=2)/likely benign (n=3)). Based on the evidence outlined above, the variant was classified as VUS-possibly benign. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Dec 07, 2015

This variant is denoted BRCA2 c.9043A>G at the cDNA level, p.Lys3015Glu (K3015E) at the protein level, and results in the change of a Lysine to a Glutamic Acid (AAA>GAA). Using alternate nomenclature, this variant would be defined as BRCA2 9271A>G. This variant has not, to our knowledge, been published in the literature as pathogenic or benign. BRCA2 Lys3015Glu was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, suggesting it is not a common benign variant in these populations. Since Lysine and Glutamic Acid differ in polarity, charge, size or other properties, this is considered a non-conservative amino acid substitution. BRCA2 Lys3015Glu occurs at a position that is not conserved and is located in the DNA binding domain (Borg 2010). In silico analyses predict that this variant is unlikely to alter protein structure or function. Based on currently available evidence, it is unclear whether BRCA2 Lys3015Glu is a pathogenic or benign variant. We consider it to be a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	0.0022	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	20
DANN	Uncertain	1.0
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.35
FATHMM_MKL	Benign	0.64	D
M_CAP	Benign	0.041	D
MetaRNN	Benign	0.24	T;T
MetaSVM	Benign	-0.88	T
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.82	N;N
REVEL	Benign	0.28
Sift	Benign	0.086	T;T
Sift4G	Benign	0.60	T;T
Vest4		0.41
MutPred		0.25		Loss of MoRF binding (P = 0.0033);Loss of MoRF binding (P = 0.0033);
MVP		0.83
MPC		0.069
ClinPred		0.45	T
GERP RS		-2.1
gMVP		0.23

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs587781497; hg19: chr13-32953976;