chr13-32362684-T-A

Position:

• chr13-32362684-T-A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_000059.4(BRCA2):​c.7967T>A​(p.Leu2656Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA2 NM_000059.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:2
• Conservation: PhyloP100: 7.93

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 Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.956
• PP5: Variant 13-32362684-T-A is Pathogenic according to our data. Variant chr13-32362684-T-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 409564.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.7967T>A	p.Leu2656Gln	missense_variant	17/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.7967T>A	p.Leu2656Gln	missense_variant	17/27	5	NM_000059.4	ENSP00000369497.3
BRCA2	ENST00000530893.7	c.7598T>A	p.Leu2533Gln	missense_variant	17/27	1		ENSP00000499438.2
BRCA2	ENST00000614259.2	n.*25T>A		non_coding_transcript_exon_variant	16/26	2		ENSP00000506251.1
BRCA2	ENST00000614259	n.*25T>A		3_prime_UTR_variant	16/25	2		ENSP00000506251.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 26, 2023

The p.L2656Q variant (also known as c.7967T>A), located in coding exon 16 of the BRCA2 gene, results from a T to A substitution at nucleotide position 7967. The leucine at codon 2656 is replaced by glutamine, an amino acid with dissimilar properties. This variant was non-functional in a homology-directed DNA repair assay (Ambry internal data). This alteration is also predicted to destabilize the local structure and disrupt the protein binding ability of BRCA2 (Yang H et al. Science 2002 Sep;297:1837-48; Marston NJ et al. Mol. Cell. Biol. 1999 Jul;19:4633-42; Ambry internal data). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

BRCA2-related cancer predisposition Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Jul 20, 2024

This missense variant replaces leucine with glutamine at codon 2656 of the BRCA2 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function. A functional study performed by an external laboratory has shown this variant is non-functional in homology-directed DNA repair (ClinVar Accession SCV001189495.4). This variant has not been reported in individuals affected with BRCA2-related disorders in the literature. This variant has not been identified 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. -

Hereditary breast ovarian cancer syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 19, 2018

In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a BRCA2-related disease. This sequence change replaces leucine with glutamine at codon 2656 of the BRCA2 protein (p.Leu2656Gln). The leucine residue is highly conserved and there is a moderate physicochemical difference between leucine and glutamine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.42
CADD	Pathogenic	27
DANN	Uncertain	0.99
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.97	D
M_CAP	Pathogenic	0.58	D
MetaRNN	Pathogenic	0.96	D;D
MetaSVM	Pathogenic	0.92	D
PrimateAI	Uncertain	0.78	T
PROVEAN	Benign	-1.6	N;N
REVEL	Pathogenic	0.90
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Vest4		0.93
MutPred		0.82		Gain of disorder (P = 0.0443);Gain of disorder (P = 0.0443);
MVP		0.98
MPC		0.17
ClinPred		0.99	D
GERP RS		5.7
gMVP		0.79

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: rs886037817; hg19: chr13-32936821;