13-32338208-GAAAA-GA

Position:

• chr13-32338208-GAAAA-GA

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 1P and 1B. PM4_Supporting BP6

The NM_000059.4(BRCA2):​c.3858_3860del​(p.Lys1286del) variant causes a inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000732 in 1,544,016 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00042 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000035 (0 hom.)
• Consequence: BRCA2 NM_000059.4 inframe_deletion
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7 B:14
• Conservation: PhyloP100: 2.46

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM4: Nonframeshift variant in NON repetitive region in NM_000059.4. Strenght limited to Supporting due to length of the change: 1aa.
• BP6: Variant 13-32338208-GAAA-G is Benign according to our data. Variant chr13-32338208-GAAA-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 37861.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=9, Benign=3, Uncertain_significance=4}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.3858_3860del	p.Lys1286del	inframe_deletion	11/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.3858_3860del	p.Lys1286del	inframe_deletion	11/27	5	NM_000059.4	ENSP00000369497	A2

Frequencies

GnomAD3 genomes AF: 0.000401 AC: 61 AN: 152014 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00138

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

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: 0.000478

GnomAD3 exomes AF: 0.0000869 AC: 17 AN: 195552 Hom.: 0 AF XY: 0.0000842 AC XY: 9 AN XY: 106940

Gnomad AFR exome AF: 0.000894

Gnomad AMR exome AF: 0.000179

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: 0.0000108

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000352 AC: 49 AN: 1391884 Hom.: 0 AF XY: 0.0000349 AC XY: 24 AN XY: 688480

Gnomad4 AFR exome AF: 0.000890

Gnomad4 AMR exome AF: 0.0000934

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: 0.00000836

Gnomad4 OTH exome AF: 0.000175

GnomAD4 genome AF: 0.000421 AC: 64 AN: 152132 Hom.: 0 Cov.: 33 AF XY: 0.000390 AC XY: 29 AN XY: 74380

Gnomad4 AFR AF: 0.00144

Gnomad4 AMR AF: 0.000131

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: 0.000473

Alfa AF: 0.0000435 Hom.: 0

Bravo AF: 0.000457

Asia WGS AF: 0.000867 AC: 3 AN: 3476

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7 Benign:14

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 2 Uncertain:2 Benign:3

Benign, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Sep 25, 2009	- -
Likely benign, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	Mar 29, 2024	- -
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	Feb 05, 2024	- -

not provided Uncertain:1 Benign:2

Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Nov 03, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 17, 2021	This variant is associated with the following publications: (PMID: 27741520, 19941162, 9971877, 10717622) -
Likely benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Jan 13, 2023	- -

not specified Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Nov 21, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jul 25, 2024	Variant summary: BRCA2 c.3858_3860delAAA (p.Lys1286del) results in an in-frame deletion that is predicted to remove one amino acids from the encoded protein. The variant allele was found at a frequency of 7.4e-05 in 1544206 control chromosomes, predominantly at a frequency of 0.0012 within the African or African-American subpopulation in the gnomAD database (v4). The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 2 fold of the estimated maximal expected allele frequency for a pathogenic variant in BRCA2 causing Hereditary Breast And Ovarian Cancer Syndrome phenotype (0.00075). c.3858_3860delAAA has been reported in the literature in individuals affected with breast and/or ovarian Cancer (e.g. Malone_2000, Fernandes_2016, Eygelaar_2022), but also healthy controls (e.g. Wagner_1999). 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. The following publications have been ascertained in the context of this evaluation (PMID: 9971877, 19941162, 23056405, 10717622, 17826769, 27741520, 26933808, 33643918, 35039564). ClinVar contains an entry for this variant (Variation ID: 37861). Based on the evidence outlined above, the variant was classified as benign. -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 17, 2016	- -

Hereditary cancer-predisposing syndrome Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Sep 19, 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. -
Likely benign, criteria provided, single submitter	curation	Sema4, Sema4	Jul 12, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Sep 21, 2015	- -

Hereditary breast ovarian cancer syndrome Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	National Health Laboratory Service, Universitas Academic Hospital and University of the Free State	Nov 16, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 01, 2024	- -

Breast and/or ovarian cancer Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Aug 08, 2022

- -

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.Lys1286del variant has been previously reported in the literature (Wagner 1999), and was listed 7X in the BIC database with unknown clinical significance. It is listed in the dbSNP database as coming from a “clinical source” (ID#: rs80359407) however no frequency information was provided. This is an in frame-deletion which removes amino acid, Lys, from the encoded BRCA2 protein at codon 1286, however the impact on the protein function is not known. In summary, the clinical significance of this variant cannot be determined with certainty at this time. Therefore this variant is classified as a variant of unknown significance (VUS). -

Hepatoblastoma Uncertain:1

Uncertain significance, no assertion criteria provided

research

Molecular Oncology - Human Genetics Lab, University of Sao Paulo

-

- -

BRCA2-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Aug 02, 2020

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Familial cancer of breast Benign:1

Benign, criteria provided, single submitter

clinical testing

MGZ Medical Genetics Center

Feb 09, 2024

ACMG codes applied following ENIGMA VCEP rules: BS1, BP1_STR -

Computational scores

Source: dbNSFP v4.3

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: rs80359406; hg19: chr13-32912345;