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BRCA Mutations-The Achilles Heel of Breast, Ovarian and Other Epithelial Cancers

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MDPI
DOI: 10.3390/ijms24054982

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breast cancer; ovarian cancer; PARP inhibitors; Alu repeats; protein-protein interactions

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The tumor suppressor genes BRCA1 and BRCA2 are associated with early-onset breast and ovarian cancers. This review explores the hypothesis that Alu mobile genomic elements may be involved in the extensive mutagenesis of these genes. Understanding the connection between mutations in BRCA1 and BRCA2 and genome stability and DNA repair mechanisms is crucial for therapeutic decision-making in cancer treatment.
Two related tumor suppressor genes, BRCA1 and BRCA2, attract a lot of attention from both fundamental and clinical points of view. Oncogenic hereditary mutations in these genes are firmly linked to the early onset of breast and ovarian cancers. However, the molecular mechanisms that drive extensive mutagenesis in these genes are not known. In this review, we hypothesize that one of the potential mechanisms behind this phenomenon can be mediated by Alu mobile genomic elements. Linking mutations in the BRCA1 and BRCA2 genes to the general mechanisms of genome stability and DNA repair is critical to ensure the rationalized choice of anti-cancer therapy. Accordingly, we review the literature available on the mechanisms of DNA damage repair where these proteins are involved, and how the inactivating mutations in these genes (BRCAness) can be exploited in anti-cancer therapy. We also discuss a hypothesis explaining why breast and ovarian epithelial tissues are preferentially susceptible to mutations in BRCA genes. Finally, we discuss prospective novel therapeutic approaches for treating BRCAness cancers.

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