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The breast cancer susceptibility gene 1 (BRCA1) has been shown to maintain genomic stability through multiple functions in the regulation of DNA damage repair and transcription. Its translated BRCT (BRCA1 C-terminal domain) acts as a strong transcriptional activator. BRCA1 damaged by carboplatin treatment may lead to a loss of such functions. To address the possibility of the BRCA1 gene as a therapeutic target for carboplatin, we investigated the functional consequences of the 3′-terminal region of human BRCA1 following in vitro platination with carboplatin. A reduction in cellular BRCA1 repair of carboplatin-treated plasmid DNA, using a host cell reactivation assay, was dependent on the platination levels on the reporter gene. The transcriptional transactivation activity of the drug-modified BRCA1, assessed using a one-hybrid GAL4 transcriptional assay, was inversely proportional to the carboplatin doses. The data emphasized the potential of the BRCA1 gene to be a target for carboplatin treatment.
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