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Screening of the BRCA1 gene in Brazilian patients with breast and/or ovarian cancer via high-resolution melting reaction analysis

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Abstract

The aim of this study was to evaluate the profile of BRCA1 mutations among cancer-affected Brazilian women from the Midwest region of Minas Gerais state with clearly defined risk factors for hereditary breast and ovarian cancer (HBOC) syndrome. In this Brazilian region, the first Center for Hereditary Cancer Control began operation in 2011, and 90 % of patients receive assistance from the public health service. Eighteen patients at high risk for HBOC were subjected to molecular analysis. Primers were designed for 22 coding exons of the gene; DNA was extracted; and real-time PCR followed by high-resolution melting reaction was performed. The amplicons were sequenced to confirm the identified profiles. Only exon 11 was directly sequenced due its length. Multiplex ligation-dependent probe amplification (MLPA) was performed for those patients in whom no pathogenic mutations were found. Among the 14 alterations identified in this study, the c.5263_5264insC pathogenic mutation was present in two patients (11.1 %). Four alterations showed no clinical relevance; one exhibited inconclusive clinical relevance according to the examined databases; and eight alterations presented a divergent classification between the databases. No deletions or duplications were found using the MLPA technique. The HRM methodology was highly sensitive in identifying variants in the BRCA1 gene and can dramatically reduce the amount of sequencing required to identify germline mutations in BRCA genes, enabling cheaper tests and increasing their availability to Brazilian women assisted by the public health service.

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Acknowledgments

This study was funded by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, APQ-02863-11), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, 401989/2010-0) and Associação de Combate ao Câncer do Centro Oeste de Minas Gerais (ACCCOM).

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Authors and Affiliations

  1. Universidade Federal de São João del Rei (UFSJ), 400 Sebastião Gonçalves Coelho Ave., Chanadour, Divinópolis, MG, 35501-296, Brazil

    Eneida Santos de Oliveira, Bárbara Luisa Soares, Leandro Augusto Barbosa, Débora de Oliveira Lopes & Luciana Lara dos Santos

  2. Associação de Combate ao Câncer do Centro Oeste de Minas Gerais (ACCCOM), 500 Topázio St., Niterói, Divinópolis, MG, 35500-215, Brazil

    Sara Lemos & Angélica Nogueira Rodrigues

  3. Centro Universitário de Formiga (UNIFOR-MG), 328 Arnaldo Senna Ave., Água Vermelha, Formiga, MG, 35570-000, Brazil

    Reginaldo Cruz Alves Rosa

Authors
  1. Eneida Santos de Oliveira
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  2. Bárbara Luisa Soares
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  3. Sara Lemos
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  4. Reginaldo Cruz Alves Rosa
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  5. Angélica Nogueira Rodrigues
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  6. Leandro Augusto Barbosa
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  7. Débora de Oliveira Lopes
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  8. Luciana Lara dos Santos
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Correspondence to Luciana Lara dos Santos.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee.

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Informed consent was obtained from all individual participants included in the study.

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de Oliveira, E.S., Soares, B.L., Lemos, S. et al. Screening of the BRCA1 gene in Brazilian patients with breast and/or ovarian cancer via high-resolution melting reaction analysis. Familial Cancer 15, 173–181 (2016). https://doi.org/10.1007/s10689-015-9858-0

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  • DOI: https://doi.org/10.1007/s10689-015-9858-0

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