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BRCA1 and c-Myc Associate to Transcriptionally Repress Psoriasin, a DNA Damage–Inducible Gene

¹ Cancer Research Centre, Queen's University Belfast; Departments of ² Pathology and ³ Medical Genetics, Belfast City Hospital, Belfast, United Kingdom; ⁴ Department of Pathology, Faculty of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada; ⁵ Arradx Ltd., Craigavon, United Kingdom; and ⁶ European Molecular Biology Laboratory, Heidelberg, Germany

Requests for reprints: D. Paul Harkin, Cancer Research Centre, Queen's University Belfast, University Floor, Belfast City Hospital, Belfast BT9 7AB, United Kingdom. Phone: 44-2890329241; Fax: 44-2890263744; E-mail: d.harkin{at}qub.ac.uk.

Evidence is accumulating to suggest that some of the diverse functions associated with BRCA1 may relate to its ability to transcriptionally regulate key downstream target genes. Here, we identify S100A7 (psoriasin), S100A8, and S100A9, members of the S100A family of calcium-binding proteins, as novel BRCA1-repressed targets. We show that functional BRCA1 is required for repression of these family members and that a BRCA1 disease–associated mutation abrogates BRCA1-mediated repression of psoriasin. Furthermore, we show that BRCA1 and c-Myc form a complex on the psoriasin promoter and that BRCA1-mediated repression of psoriasin is dependent on functional c-Myc. Finally, we show that psoriasin expression is induced by the topoisomerase II poison, etoposide, in the absence of functional BRCA1 and increased psoriasin expression enhances cellular sensitivity to this chemotherapeutic agent. Therefore, we identified a novel transcriptional mechanism that is likely to contribute to BRCA1-mediated resistance to etoposide.

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