New germline BRCA2 gene variant in the Tuvinian Mongol breast cancer patients.

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ID: 4391
2019
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Abstract
To date, there are a limited number of reports on inherited gene mutations associated with breast cancer (BC) among Mongoloid indigenous people in Russia. The present study aimed at identifying the BC-associated genes in 26 Russian Mongoloid BC patients (Buryats, Tuvinians and others). The median age of the patients at the time of breast cancer diagnosis was 41 years (range 25-51 years). Genomic DNA isolated from blood samples was used to prepare libraries using a capture-based target enrichment kit (Hereditary Cancer Solution™, SOPHiA GENETICS, Switzerland) covering 27 genes (ATM, APC, BARD1, BRCA1, BRCA2, BRIP1, CDH1, CHEK2, EPCAM, FAM175A, MLH1, MRE11A, MSH2, MSH6, MUTYH, NBN, PALB2, PIK3CA, PMS2, PMS2CL, PTEN, RAD50, RAD51C, RAD51D, STK11, TP53 and XRCC2). Next-generation sequencing (NGS) was performed on an Illumina NextSeq 500 System (Illumina, USA). In our study, we found 1 Indel and 11 SNPs that passed filters during variant calling. We identified a highly pathogenic germline rs483353122 (c.8208_8209insAG, p.Leu2737Serfs*2) in the BRCA2 gene in six unrelated Tuvinian Mongol BC patients. We also identified a likely damaging germline rs35352891 in the MUTYH gene (c.1118C>T, p.Ala373Val) in one Buryat Mongol BC patient. Other SNPs were classified as variants of uncertain significance. To the best of our knowledge, this report is the first to describe the highly pathogenic variant in the BRCA2 gene (rs483353122) and the likely damaging germline variant in the MUTYH gene (rs35352891) in Russian Mongoloid BC patients with young-onset and/or bilateral and/or familial BC. Further studies are therefore necessary to evaluate the contributions of novel sequence variants to hereditary BC.
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gervas2019newmolecular Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Gervas, Polina;Klyuch, Boris;Denisov, Evgeny;Kiselev, Artem;Molokov, Alexey;Pisareva, Lubov;Malinovskaya, Elena;Choynzonov, Evgeny;Cherdyntseva, Nadezda;
Journal molecular biology reports
Year 2019
DOI
10.1007/s11033-019-04928-y
URL
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