13-32340515-G-C

Position:

• chr13-32340515-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1 PM2 BP6

The NM_000059.4(BRCA2):​c.6160G>C​(p.Ala2054Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: BRCA2 NM_000059.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:1
• Conservation: PhyloP100: 0.0800

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]

BRCA2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a repeat BRCA2 8 (size 34) in uniprot entity BRCA2_HUMAN there are 4 pathogenic changes around while only 1 benign (80%) in NM_000059.4
• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 13-32340515-G-C is Benign according to our data. Variant chr13-32340515-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 52021.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.6160G>C	p.Ala2054Pro	missense_variant	11/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.6160G>C	p.Ala2054Pro	missense_variant	11/27	5	NM_000059.4	ENSP00000369497.3
BRCA2	ENST00000530893.7	c.5791G>C	p.Ala1931Pro	missense_variant	11/27	1		ENSP00000499438.2
BRCA2	ENST00000614259.2	n.6160G>C		non_coding_transcript_exon_variant	10/26	2		ENSP00000506251.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 44

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	curation	University of Washington Department of Laboratory Medicine, University of Washington	Mar 23, 2023	Missense variant in a coldspot region where missense variants are very unlikely to be pathogenic (PMID:31911673). -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 12, 2024	The p.A2054P variant (also known as c.6160G>C), located in coding exon 10 of the BRCA2 gene, results from a G to C substitution at nucleotide position 6160. The alanine at codon 2054 is replaced by proline, an amino acid with highly similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

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

Uncertain significance, no assertion criteria provided

clinical testing

Breast Cancer Information Core (BIC) (BRCA2)

Feb 20, 2004

- -

Hereditary breast ovarian cancer syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 28, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt BRCA2 protein function. This variant has been reported in an individual affected with esophageal cancer (PMID: 14647438). ClinVar contains an entry for this variant (Variation ID: 52021). This variant is not present in population databases (ExAC no frequency). This sequence change replaces alanine with proline at codon 2054 of the BRCA2 protein (p.Ala2054Pro). The alanine residue is weakly conserved and there is a small physicochemical difference between alanine and proline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	20
DANN	Uncertain	1.0
Eigen	Benign	-0.34
Eigen_PC	Benign	-0.30
FATHMM_MKL	Benign	0.033	N
M_CAP	Benign	0.037	D
MetaRNN	Uncertain	0.62	D;D
MetaSVM	Benign	-0.95	T
PrimateAI	Benign	0.23	T
PROVEAN	Uncertain	-3.9	D;D
REVEL	Uncertain	0.39
Sift	Uncertain	0.020	D;D
Sift4G	Benign	0.074	T;T
Vest4		0.80
MutPred		0.54		Loss of sheet (P = 0.0228);Loss of sheet (P = 0.0228);
MVP		0.82
MPC		0.044
ClinPred		0.75	D
GERP RS		2.2
gMVP		0.31

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: rs80358855; hg19: chr13-32914652;