Cytochrome P450 aromatase (cyp19) catalyzes the conversion of androgens into estrogens. Teleosts have distinct, ovarian specific (cyp19a1a) and brain specific (cyp19a1b) cyp19 genes. Previous studies in teleosts demonstrated regulation of cyp19a1a expression by the NR5A nuclear receptor subfamily as well as a fork head transcription factor, FOXL2. In the present study, we investigated the involvement of fushi tarazu factor 1, FTZ-F1, a NR5A subfamily member, and FOXL2 in the regulation of cyp19a1b expression in brain of the air-breathing catfish, Clarias gariepinus. Based on the synchronous expression pattern of cyp19a1b, FTZ-F1 and FOXL2 in the brain, we isolated the 5' upstream region of cyp19a1b to analyse regulatory motifs. Promoter motif analysis revealed FTZ-F1/NR5A1 and FOXL2 binding nucleotide sequences. Transient transfection studies showed that FTZ-F1 and FOXL2 together enhanced the transcriptional activity of cyp19a1b gene in mammalian cell lines. Mutation in either of their putative binding sites within the cyp19a1b promoter abolished this effect. Electrophoretic gel mobility shift experiments indicated that FTZ-F1 and FOXL2 proteins bind to the synthesized radio-labelled oligomers used as probes and mobility shifted upon addition of their respective antibodies. Chromatin immunoprecipitation assay confirmed the binding of both these transcription factors to their corresponding cis-acting elements in the upstream region of cyp19a1b. To our knowledge, this study is the first report on the transcriptional regulation of cyp19a1b by FTZ-F1 and FOXL2 in a teleost fish.
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