13-32338117-G-T

Variant names:

• chr13-32338117-G-T
• rs777028631
• NM_000059.4:c.3762G>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_Moderate BP6

The NM_000059.4(BRCA2):​c.3762G>T​(p.Glu1254Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000412 in 1,456,392 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. E1254E) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: BRCA2 NM_000059.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7 B:3
• Conservation: PhyloP100: 1.46
• Publications: 9 publications found

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 Gene-Disease associations (from GenCC):

• breast-ovarian cancer, familial, susceptibility to, 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), ClinGen
• Fanconi anemia complementation group D1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, G2P
• pancreatic cancer, susceptibility to, 2

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• sarcoma

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• hereditary breast ovarian cancer syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Fanconi anemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• medulloblastoma

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.18782952).
• BP6: Variant 13-32338117-G-T is Benign according to our data. Variant chr13-32338117-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 234481.We mark this variant Likely_benign, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.3762G>T	p.Glu1254Asp	missense_variant	Exon 11 of 27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.3762G>T	p.Glu1254Asp	missense_variant	Exon 11 of 27	5	NM_000059.4	ENSP00000369497.3
BRCA2	ENST00000530893.7	c.3393G>T	p.Glu1131Asp	missense_variant	Exon 11 of 27	1		ENSP00000499438.2
BRCA2	ENST00000614259.2	n.3762G>T		non_coding_transcript_exon_variant	Exon 10 of 26	2		ENSP00000506251.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000407 AC: 1 AN: 245818 AF XY: 0.00000753

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000897

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000412 AC: 6 AN: 1456392 Hom.: 0 Cov.: 34 AF XY: 0.00000276 AC XY: 2 AN XY: 723910

African (AFR) AF: 0.00 AC: 0 AN: 33274

American (AMR) AF: 0.00 AC: 0 AN: 43956

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25956

East Asian (EAS) AF: 0.00 AC: 0 AN: 39658

South Asian (SAS) AF: 0.00 AC: 0 AN: 84724

European-Finnish (FIN) AF: 0.0000188 AC: 1 AN: 53108

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5736

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1109768

Other (OTH) AF: 0.0000166 AC: 1 AN: 60212

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Uncertain:3

Feb 20, 2023

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: BRCA2 c.3762G>T (p.Glu1254Asp) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 4.1e-06 in 245818 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.3762G>T has been reported in the literature in individuals affected with Hereditary Breast And Ovarian Cancer Syndrome without strong evidence for causality (Ozcelik_2012, Loizidou_2017, Incorvaia_2020). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Six clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Five submitters classified the variant as VUS while one classified as likely benign. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Mar 07, 2017

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is denoted BRCA2 c.3762G>T at the cDNA level, p.Glu1254Asp (E1254D) at the protein level, and results in the change of a Glutamic Acid to an Aspartic Acid (GAG>GAT). Using alternate nomenclature, this variant has been previously published as BRCA2 3990G>T. This variant was observed in a patient with familial breast cancer (Ozcelik 2012). BRCA2 Glu1254Asp was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. Since Glutamic Acid and Aspartic Acid share similar properties, this is considered a conservative amino acid substitution. BRCA2 Glu1254Asp occurs at a position that is not conserved and is not located in a known functional domain (UniProt). In silico analyses predict that this variant is unlikely to alter protein structure or function. Based on currently available information, it is unclear whether BRCA2 Glu1254Asp is pathogenic or benign. We consider it to be a variant of uncertain significance. -

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:2

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). -

Jan 30, 2024

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces glutamic acid with aspartic acid at codon 1254 of the BRCA2 protein. Computational prediction suggests that this variant may not impact protein structure and function. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with breast or ovarian cancer (PMID: 22874498, 27882536, 32380732). In a large breast cancer case-control meta-analysis conducted by the BRIDGES consortium, this variant was reported in 3/60466 cases and 6/53461 controls (PMID: 33471991; Leiden Open Variation Database DB-ID BRCA2_007348). This variant has been identified in 1/245818 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. -

Dec 09, 2021

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

BRCA2-related cancer predisposition Uncertain:1

Sep 23, 2024

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Malignant tumor of breast Uncertain:1

-

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The BRCA2 p.Glu1254Asp variant was identified in 1 of 24 proband chromosomes (frequency: 0.04) from individuals or families with familial breast cancer and was not identified in 200 control chromosomes from healthy individuals (Ozcelik 2012). The variant was identified in dbSNP (ID: rs777028631) as “with Likely benign, uncertain significance allele”, and in the ClinVar (as uncertain significance by GeneDx, Invitae and Ambry Genetics). The variant was not identified in GeneInsight-COGR, Cosmic, MutDB, LOVD 3.0, UMD-LSDB, BIC Database, ARUP Laboratories, or the Zhejiang University Database. The variant was identified in control databases in 1 of 240824 chromosomes at a frequency of 0.000004 (Genome Aggregation Database Feb 27, 2017). Breakdown of the observations by population include European Non-Finnish in 1 of 109484 chromosomes (freq: 0.00001), while the variant was not observed in the African, Other, Latino, Ashkenazi Jewish, East Asian, Finnish, and South Asian populations. The p.Glu1254 residue is not conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) do not suggest a high likelihood of impact to the protein; however, this information is not predictive enough to rule out pathogenicity. The variant occurs outside of the splicing consensus sequence and 3 of 5 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) predict a greater than 10% difference in splicing. However, this information is not predictive enough to assume pathogenicity. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Hereditary breast ovarian cancer syndrome Uncertain:1

Sep 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with aspartic acid, which is acidic and polar, at codon 1254 of the BRCA2 protein (p.Glu1254Asp). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individual(s) with breast and/or ovarian cancer (PMID: 22874498, 27882536, 32380732, 34178674). This variant is also known as 3990G>T. ClinVar contains an entry for this variant (Variation ID: 234481). 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. -

Familial cancer of breast Benign:1

Feb 09, 2024

MGZ Medical Genetics Center

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG codes applied following ENIGMA VCEP rules: BP1_STR, PM2_SUP -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	14
DANN	Uncertain	0.99
Eigen	Benign	-0.57
Eigen_PC	Benign	-0.64
FATHMM_MKL	Benign	0.11	N
M_CAP	Uncertain	0.096	D
MetaRNN	Benign	0.19	T;T
MetaSVM	Benign	-0.89	T
PhyloP100		1.5
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-2.3	N;N
REVEL	Benign	0.20
Sift	Benign	0.040	D;D
Sift4G	Benign	0.42	T;T
Vest4		0.29
MutPred		0.13		Gain of loop (P = 0.0851);Gain of loop (P = 0.0851);
MVP		0.85
MPC		0.041
ClinPred		0.33	T
GERP RS		3.2
gMVP		0.14
Mutation Taster		=76/24	polymorphism

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

Other links and lift over

dbSNP: rs777028631; hg19: chr13-32912254;