13-32338401-T-C

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4BP6_Very_Strong

The NM_000059.4(BRCA2):c.4046T>C(p.Ile1349Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000256 in 1,601,472 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 Benign (★★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I1349S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000028 ( 0 hom. )

Consequence

BRCA2
NM_000059.4 missense

Scores

Clinical Significance

Benign reviewed by expert panel U:1B:8

Conservation

PhyloP100: -0.328

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 Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.31087905).

BP6

Variant 13-32338401-T-C is Benign according to our data. Variant chr13-32338401-T-C is described in ClinVar as [Benign]. Clinvar id is 51586.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr13-32338401-T-C is described in Lovd as [Benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA2	NM_000059.4 linkuse as main transcript	c.4046T>C	p.Ile1349Thr	missense_variant	11/27	ENST00000380152.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA2	ENST00000380152.8 linkuse as main transcript	c.4046T>C	p.Ile1349Thr	missense_variant	11/27	5	NM_000059.4	A2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000125

AC:

AN:

239668

Hom.:

AF XY:

0.00000773

AC XY:

AN XY:

129288

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000272

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000276

AC:

AN:

1449286

Hom.:

Cov.:

AF XY:

0.0000333

AC XY:

AN XY:

719918

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000316

Gnomad4 OTH exome

AF:

0.0000834

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152186

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74362

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000282

Hom.:

Bravo

AF:

0.0000151

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Benign

Submissions summary: Uncertain:1Benign:8

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 2

Uncertain:1Benign:2

Benign, reviewed by expert panel	curation	Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)	Aug 10, 2015	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 = 0.0000088 -
Uncertain significance, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA2)	May 29, 2002	- -
Benign, criteria provided, single submitter	clinical testing	Counsyl	Mar 03, 2016	- -

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Apr 23, 2020	This variant is associated with the following publications: (PMID: 10923033, 25682074, 24323938, 21990134, 17924331, 18418466) -
Likely benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Aug 09, 2023	- -

Hereditary cancer-predisposing syndrome

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Sep 11, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 19, 2014	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. -

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

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

Apr 18, 2019

Variant summary: BRCA2 c.4046T>C (p.Ile1349Thr) results in a non-conservative amino acid change located in the BRCA2 repeat region, between the repeats BRC2 and BRC3 (IPR002093) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 1.3e-05 in 239668 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. Though the variant, c.4046T>C, has been reported in the literature in 2 individuals affected with triple-negative breast cancer (Wong-Brown 2015), this report does not provide unequivocal conclusions about association of the variant with Hereditary Breast and Ovarian Cancer. Co-occurrence with another pathogenic variant has been reported (BRCA2 c.8770G>T / p.Glu2924Ter; in the BIC database), providing supporting evidence for a benign role. In addition, multifactorial probability models, performing systematic assessments of variants of unknown significance in the BRCA genes, which included analysis of co-occurrence in trans with known deleterious mutations, personal and family history of cancer, tumor pathology and co-segregation with disease in pedigrees, predicted this variant to be neutral (Easton 2007 and Lindor 2012). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Six submitters including and one expert panel have provided clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All submitters including the expert panel have classified the variant as benign (n=2) or likely benign (n=4). Based on the evidence outlined above, the variant was classified as likely benign until additional clinical and functional evidence become available. -

Hereditary breast ovarian cancer syndrome

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 02, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.087

BayesDel_noAF

Benign

-0.29

Cadd

Benign

8.1

Dann

Uncertain

0.99

Eigen

Benign

-0.56

Eigen_PC

Benign

-0.64

FATHMM_MKL

Benign

0.032

M_CAP

Uncertain

0.091

MetaRNN

Benign

0.31

T;T

MetaSVM

Benign

-0.92

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.34

PROVEAN

Uncertain

-3.4

D;D

REVEL

Benign

0.17

Sift

Uncertain

0.017

D;D

Sift4G

Uncertain

0.034

D;D

Vest4

0.53

MutPred

0.53

Loss of stability (P = 0.0014);Loss of stability (P = 0.0014);

MVP

0.88

MPC

0.033

ClinPred

0.21

GERP RS

3.4

gMVP

0.18

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