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  • Title: Characterization, expression and transcriptional regulation of P450c17-I and -II in the medaka, Oryzias latipes.
    Author: Zhou LY, Wang DS, Shibata Y, Paul-Prasanth B, Suzuki A, Nagahama Y.
    Journal: Biochem Biophys Res Commun; 2007 Oct 26; 362(3):619-25. PubMed ID: 17723227.
    Abstract:
    Recently we reported the isolation of two types of cytochrome P450c17s (steroid 17alpha-hydroxylase/C17, 20 lyase) encoded by two different genes, from genomes of teleost fish. In this study, we characterized the expression profile, enzymatic activity and transcriptional regulation of P450c17-I and -II in the medaka ovary. Similar to tilapia, medaka P450c17-I possessed both hydroxylase and lyase activities, while P450c17-II possessed only the hydroxylase activity. In situ hybridization and gene expression profiles during 48h prior to spawning indicated that P450c17-I is responsible for the production of estradiol-17beta during oocyte growth, while P450c17-II for the production of 17alpha, 20beta-dihydroxy-4-pregnen-3-one during oocyte maturation and cortisol production in the head kidney. Luciferase assays and expression profiles of transcription factors as revealed by real time PCR suggested that P450c17-I and -II expression are tightly controlled by Ad4BP/SF-1, Lrh-1, Foxl2, and Dax1 during the 48 h prior to spawning.
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