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BRCA1 VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer

  • Authors:
    • Rita Adubeiro Lourenço
    • Miguel Lança
    • Octávia Monteiro Gil
    • Joana Cardoso
    • Teresa Lourenço
    • José B. Pereira-Leal
    • António Sebastião Rodrigues
    • José Rueff
    • Susana Nunes Silva
  • View Affiliations / Copyright

    Affiliations: ToxOmics, NOVA Medical School, Faculdade de Ciências Médicas, NMS, FCM, Universidade NOVA de Lisboa, 1150-082 Lisbon, Portugal, Center for Nuclear Sciences and Technologies, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela, Loures, Portugal, Ophiomics-Precision Medicine, 1600-514 Lisbon, Portugal
    Copyright: © Lourenço et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 136
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    Published online on: May 26, 2023
       https://doi.org/10.3892/mmr.2023.13023
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Abstract

Genetic testing for susceptibility genes through next‑generation sequencing (NGS) has become a widely used technique. Using this, a number of genetic variants have been identified, several of which are variants of unknown significance (VUS). These VUS can either be pathogenic or benign. However, since their biological effect remains unclear, functional assays are required to classify their functional nature. As the use of NGS becomes more mainstream as a diagnostic tool in clinical practice, the number of VUS is expected to increase. This necessitates their biological and functional classification. In the present study, a VUS was identified in the BRCA1 gene (NM_007294.3:c.1067A>G) in two women at risk for breast cancer, for which no functional data has been reported. Therefore, peripheral lymphocytes were isolated from the two women and also from two women without the VUS. DNA from all samples were sequenced by NGS of a breast cancer clinical panel. Since the BRCA1 gene is involved in DNA repair and apoptosis, the functional assays chromosomal aberrations, cytokinesis‑blocked micronucleus, comet, γH2AX, caspase and TUNEL assays were then conducted on these lymphocytes after a genotoxic challenge by ionizing radiation or doxorubicin to assess the functional role of this VUS. The micronucleus and TUNEL assays revealed a lower degree of DNA induced‑damage in the VUS group compared with those without the VUS. The other assays showed no significant differences between the groups. These results suggested that this BRCA1 VUS is likely benign, since the VUS carriers were apparently protected from deleterious chromosomal rearrangements, subsequent genomic instability and activation of apoptosis.
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Copy and paste a formatted citation
Spandidos Publications style
Lourenço RA, Lança M, Monteiro Gil O, Cardoso J, Lourenço T, Pereira-Leal JB, Rodrigues AS, Rueff J and Nunes Silva S: <em>BRCA1</em> VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer. Mol Med Rep 28: 136, 2023.
APA
Lourenço, R.A., Lança, M., Monteiro Gil, O., Cardoso, J., Lourenço, T., Pereira-Leal, J.B. ... Nunes Silva, S. (2023). <em>BRCA1</em> VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer. Molecular Medicine Reports, 28, 136. https://doi.org/10.3892/mmr.2023.13023
MLA
Lourenço, R. A., Lança, M., Monteiro Gil, O., Cardoso, J., Lourenço, T., Pereira-Leal, J. B., Rodrigues, A. S., Rueff, J., Nunes Silva, S."<em>BRCA1</em> VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer". Molecular Medicine Reports 28.1 (2023): 136.
Chicago
Lourenço, R. A., Lança, M., Monteiro Gil, O., Cardoso, J., Lourenço, T., Pereira-Leal, J. B., Rodrigues, A. S., Rueff, J., Nunes Silva, S."<em>BRCA1</em> VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer". Molecular Medicine Reports 28, no. 1 (2023): 136. https://doi.org/10.3892/mmr.2023.13023
Copy and paste a formatted citation
x
Spandidos Publications style
Lourenço RA, Lança M, Monteiro Gil O, Cardoso J, Lourenço T, Pereira-Leal JB, Rodrigues AS, Rueff J and Nunes Silva S: <em>BRCA1</em> VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer. Mol Med Rep 28: 136, 2023.
APA
Lourenço, R.A., Lança, M., Monteiro Gil, O., Cardoso, J., Lourenço, T., Pereira-Leal, J.B. ... Nunes Silva, S. (2023). <em>BRCA1</em> VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer. Molecular Medicine Reports, 28, 136. https://doi.org/10.3892/mmr.2023.13023
MLA
Lourenço, R. A., Lança, M., Monteiro Gil, O., Cardoso, J., Lourenço, T., Pereira-Leal, J. B., Rodrigues, A. S., Rueff, J., Nunes Silva, S."<em>BRCA1</em> VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer". Molecular Medicine Reports 28.1 (2023): 136.
Chicago
Lourenço, R. A., Lança, M., Monteiro Gil, O., Cardoso, J., Lourenço, T., Pereira-Leal, J. B., Rodrigues, A. S., Rueff, J., Nunes Silva, S."<em>BRCA1</em> VUS: A functional analysis to differentiate pathogenic from benign variants identified in clinical diagnostic panels for breast cancer". Molecular Medicine Reports 28, no. 1 (2023): 136. https://doi.org/10.3892/mmr.2023.13023
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