13-32398241-C-T

Position:

• chr13-32398241-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 0P and 3B. BP4_Moderate BP6

The NM_000059.4(BRCA2):​c.9728C>T​(p.Pro3243Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000991 in 1,613,842 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000089 (0 hom.)
• Consequence: BRCA2 NM_000059.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:9 B:7
• Conservation: PhyloP100: 0.253

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_benign. Variant got -3 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.1647535).
• BP6: Variant 13-32398241-C-T is Benign according to our data. Variant chr13-32398241-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 38262.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=6, Uncertain_significance=6}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.9728C>T	p.Pro3243Leu	missense_variant	27/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.9728C>T	p.Pro3243Leu	missense_variant	27/27	5	NM_000059.4	ENSP00000369497.3
BRCA2	ENST00000530893.7	c.9359C>T	p.Pro3120Leu	missense_variant	27/27	1		ENSP00000499438.2
BRCA2	ENST00000614259.2	n.*1786C>T		non_coding_transcript_exon_variant	26/26	2		ENSP00000506251.1
BRCA2	ENST00000614259.2	n.*1786C>T		3_prime_UTR_variant	26/26	2		ENSP00000506251.1

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152178 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000119 AC: 3 AN: 251118 Hom.: 0 AF XY: 0.00000737 AC XY: 1 AN XY: 135738

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000163

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: 0.00000889 AC: 13 AN: 1461664 Hom.: 0 Cov.: 31 AF XY: 0.00000963 AC XY: 7 AN XY: 727136

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: 0.0000696

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000662

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152178 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74344

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000385

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000113

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:9 Benign:7

Revision: criteria provided, conflicting classifications

Submissions by phenotype

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

Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Nov 21, 2015	- -
Benign, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Sep 01, 2010	- -
Uncertain significance, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA2)	Feb 20, 2004	- -
Likely benign, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Jan 03, 2024	- -

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Apr 03, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Jun 20, 2018	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. -
Uncertain significance, criteria provided, single submitter	curation	Sema4, Sema4	Nov 26, 2021	- -

not specified Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jan 16, 2024	Variant summary: BRCA2 c.9728C>T (p.Pro3243Leu) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. Consensus agreement among computation tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 1.2e-05 in 251118 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.9728C>T has been reported in the literature as a VUS in settings of individuals affected with and/or undergoing multigene panel testing for Hereditary Breast And Ovarian Cancer (e.g., Carney_2010, Shao_2020) as well as in at least one individual diagnosed with triple-negative breast cancer (e.g., Matta_2022), however without strong evidence for causality in these instances (e.g., lack of co-segregation data). These reports therefore 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. The following publications have been ascertained in the context of this evaluation (PMID: 21218378, 32467295, 36329109, 28508593, 31742824). ClinVar contains an entry for this variant (Variation ID: 38262). Based on an emerging peer consensus and the lack of any evidence supporting an actionable outcome as outlined above, the variant was re-classified as likely benign. -
Uncertain significance, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Aug 19, 2016	- -

not provided Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Apr 04, 2018	This variant is associated with the following publications: (PMID: 21218378) -
Uncertain significance, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Aug 16, 2024	The BRCA2 c.9728C>T (p.Pro3243Leu) variant has been reported in the published literature in individuals with breast cancer or at high risk for breast cancer (PMID: 36329109 (2022), 33471991 (2021), 21218378 (2010), and 31742824 (2020)) as well as in reportedly healthy individuals (PMID: 33471991 (2021) and 32467295 (2020)). The frequency of this variant in the general population, 0.0002 (4/19940 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. -

Hereditary breast ovarian cancer syndrome Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 25, 2024	- -
Uncertain significance, criteria provided, single submitter	research	Genetics Program, Instituto Nacional de Cancer	Nov 01, 2021	- -

Breast and/or ovarian cancer Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Foulkes Cancer Genetics LDI, Lady Davis Institute for Medical Research

Nov 21, 2014

- -

BRCA2-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 29, 2022

The BRCA2 c.9728C>T variant is predicted to result in the amino acid substitution p.Pro3243Leu. This variant was reported in a breast cancer patient with Korean-Hawaiian ancestry (see patient #45 in Table 1, Carney et al. 2010. PubMed ID: 21218378), however the patient had a family member with breast cancer who was positive for a different uncertain BRCA2 variant and it is unclear if the p.Pro3243Leu variant was a cause of disease. This variant was also reported in two Chinese breast cancer cohort studies (Supplementary Table S2, Shao et al. 2019. PubMed ID: 31742824; Supplementary Table 1, Dong et al. 2021. PubMed ID: 32467295). Computational functional effect prediction programs classified this variant as probably benign (Pejaver et al. 2017. PubMed ID: 28508593). This variant is reported in 0.020% of alleles in individuals of East Asian descent in gnomAD (http://gnomad.broadinstitute.org/variant/13-32972378-C-T) and has conflicting interpretations regarding its pathogenicity in ClinVar, ranging from likely benign to uncertain (https://www.ncbi.nlm.nih.gov/clinvar/variation/38262/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Malignant tumor of breast Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The p.Pro3243Leu variant was not identified in the literature, nor was it identified in NHLBI Exome Sequencing Project (Exome Variant Server), HGMD, LOVD, COSMIC, GeneInsight VariantWire, BIC or UMD. The variant was identified in the dbSNP database (ID#:rs80359241), but no frequency information was provided, thus the prevalence of this variant in the general population could not be determined; the Exome Aggregation Consortium (ExAC) (released Oct 20th, 2014) in 2 of 121336 chromosomes (frequency: 0.0000) from a population of East Asian (2/8642 individuals), and not in European (Non-Finnish or Finnish), Other, African, Latino, South Asian individuals; and, it was identified in ClinVar (classified as a likely benign variant by the Sharing Clinical Reports Project, derived from Myriad reports; classified as uncertain significance by BIC; and classification not provided by Invitae). The Breast Cancer IARC database notes a weak/null probability the variant creates a de novo splice donor at nt 9728 and a low probability of creating a de novo splice acceptor at nt 9736. The p.Pro3243 residue is not conserved in mammals and lower organisms and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. The c.9728C>T variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) do not predict a difference in splicing. 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 unknown significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.091
BayesDel_addAF	Benign	-0.29	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	22
DANN	Benign	0.95
Eigen	Benign	-0.15
Eigen_PC	Benign	-0.25
FATHMM_MKL	Benign	0.095	N
M_CAP	Benign	0.061	D
MetaRNN	Benign	0.16	T;T
MetaSVM	Benign	-0.89	T
PrimateAI	Benign	0.23	T
PROVEAN	Benign	-1.7	N;N
REVEL	Benign	0.13
Sift	Uncertain	0.0030	D;D
Sift4G	Benign	0.18	T;T
Vest4		0.17
MutPred		0.35		Gain of MoRF binding (P = 0.0454);Gain of MoRF binding (P = 0.0454);
MVP		0.87
MPC		0.14
ClinPred		0.52	D
GERP RS		4.2
gMVP		0.41

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.14		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: rs80359241; hg19: chr13-32972378;