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• W1973910854 abstract "The BRCA-1 tumour supressor gene was identified on the basis of mutations which occur in familial breast cancer indicating that its inactivation can cause this disease. Although BRCA-1 does not appear to be mutated in sporadic breast cancer, its expression has been shown to be reduced in tumour material from such cases. We show here that mammary tumours which have reduced levels of BRCA-1 expression show enhanced expression of the Brn-3b POU family transcription factor at both the mRNA and protein levels. This elevated expression of Brn-3b is not found in normal mammary cells, benign tumours or in malignant tumour samples which do not exhibit reduced levels of BRCA-1. In contrast, no correlation was noted between BRCA-1 and expression of the related factor Brn-3a. Moreover, Brn-3b but not Brn-3a can strongly repress the BRCA-1 promoter approximately 20-fold in mammary tumour cells. To our knowledge, this is the first report of a transcription factor which regulates BRCA-1 expression. Thus, Brn-3b may play an important role in regulating expression of BRCA-1 in mammary tumours with enhanced expression of Brn-3b resulting in reduced BRCA-1 expression and thereby being potentially important in tumour development." @default.
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• W1973910854 date "1999-11-18" @default.
• W1973910854 modified "2023-10-18" @default.
• W1973910854 title "The Brn-3b POU family transcription factor represses expression of the BRCA-1 anti-oncogene in breast cancer cells" @default.
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• W1973910854 doi "https://doi.org/10.1038/sj.onc.1203072" @default.
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