Mutations of BRCA1 reduce the enhancement of AR transactivation. PC-3
cells in 35-mm dishes were cotransfected with 0.5 μg of reporter
plasmid MMTV-LUC, 0.5 μg of pSG5AR, and 1 μg of BRCA1 construct for
2 h. 1 nM DHT was then added for 24 h before cells were
harvested for LUC assay. As compared with the wild-type BRCA1, the
cotransfection of three mutant BRCA1s, one of the constructs lacks the
C terminus of BRCA1 (BRCA1 amino acids 1–772), one has a point
mutation at its C terminus (BRCA1-P1749R), and the other lacks exon 11
(BRCA1-Δ11), reducing the enhancement of AR activity (lane 3 vs.
lanes 4–6).