13-32337895-G-C

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_000059.4(BRCA2):c.3540G>C(p.Lys1180Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,776 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K1180E) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

BRCA2
NM_000059.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:8B:1

Conservation

PhyloP100: 0.195

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.2886908).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRCA2	NM_000059.4 link	c.3540G>C	p.Lys1180Asn	missense_variant	Exon 11 of 27	ENST00000380152.8	NP_000050.3	P51587

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
BRCA2	ENST00000380152.8 link	c.3540G>C	p.Lys1180Asn	missense_variant	Exon 11 of 27	5	NM_000059.4	ENSP00000369497.3	P51587
BRCA2	ENST00000530893.7 link	c.3171G>C	p.Lys1057Asn	missense_variant	Exon 11 of 27	1		ENSP00000499438.2	A0A590UJI7
BRCA2	ENST00000614259.2 link	n.3540G>C		non_coding_transcript_exon_variant	Exon 10 of 26	2		ENSP00000506251.1	A0A7P0TAP7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250916

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135600

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461776

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727176

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:8Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:2Benign:1

Oct 03, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.K1180N variant (also known as c.3540G>C), located in coding exon 10 of the BRCA2 gene, results from a G to C substitution at nucleotide position 3540. The lysine at codon 1180 is replaced by asparagine, an amino acid with similar properties. This alteration has been reported as a variant of unknown significance in an individual with a personal history of ovarian cancer from a cohort of 1191 cancer index patients who underwent clinical evaluation and testing with multigene panels (Chan GHJ et al. Oncotarget, 2018 Jul;9:30649-30660). In another study, this alteration was detected in a patient diagnosed with breast cancer at age 51 (Wu H et al. Hum Hered, 2019 Feb;84:160-169). This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Mar 23, 2023

University of Washington Department of Laboratory Medicine, University of Washington

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: curation

Missense variant in a coldspot region where missense variants are very unlikely to be pathogenic (PMID:31911673). -

Apr 14, 2019

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:2

Jun 18, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In the published literature, this variant has been reported in individuals with breast cancer (PMID: 32101877 (2019), 35918668 (2022)) and ovarian cancer (PMID: 30093976 (2018)). In a large-scale breast cancer association study, the variant was observed in an individual with breast cancer as well as in an unaffected individual (PMID: 33471991 (2021)). The frequency of this variant in the general population, 0.000004 (1/250916 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is uninformative in the assessment of its pathogenicity. Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is benign. Based on the available information, we are unable to determine the clinical significance of this variant. -

Dec 29, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Observed in individuals with breast or ovarian cancer (Chan et al., 2018; Wu et al., 2019); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); Also known as 3768G>C; This variant is associated with the following publications: (PMID: 32101877, 30093976, 29884841, 32377563) -

Breast and/or ovarian cancer

Uncertain:1

May 05, 2023

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Familial cancer of breast

Uncertain:1

Center for Precision Medicine, Meizhou People's Hospital

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: curation

- -

Familial cancer of breast;C2675520:Breast-ovarian cancer, familial, susceptibility to, 2

Uncertain:1

Jul 12, 2021

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary breast ovarian cancer syndrome

Uncertain:1

Jan 17, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces lysine, which is basic and polar, with asparagine, which is neutral and polar, at codon 1180 of the BRCA2 protein (p.Lys1180Asn). This variant is present in population databases (no rsID available, gnomAD 0.006%). This missense change has been observed in individual(s) with ovarian and/or breast cancer (PMID: 30093976, 32101877, 35918668). ClinVar contains an entry for this variant (Variation ID: 220061). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt BRCA2 protein function with a negative predictive value of 95%. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.26

BayesDel_addAF

Benign

-0.23

BayesDel_noAF

Benign

-0.41

CADD

Benign

DANN

Uncertain

1.0

Eigen

Benign

-0.66

Eigen_PC

Benign

-0.72

FATHMM_MKL

Benign

0.13

M_CAP

Uncertain

0.12

MetaRNN

Benign

0.29

T;T

MetaSVM

Benign

-0.91

PrimateAI

Benign

0.29

PROVEAN

Uncertain

-4.0

D;D

REVEL

Benign

0.16

Sift

Uncertain

0.022

D;D

Sift4G

Benign

0.26

T;T

Vest4

0.48

MutPred

0.29

Loss of ubiquitination at K1180 (P = 0.0098);Loss of ubiquitination at K1180 (P = 0.0098);

MVP

0.80

MPC

0.059

ClinPred

0.53

GERP RS

0.85

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over