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Gene. 1997 Sep 15;197(1-2):261-8.

Molecular cloning of chicken FTZ-F1-related orphan receptors.

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Central Research Institute, Itoham Foods Inc., Ibaraki, Japan.


FTZ-F1 is a member of the orphan nuclear receptors, which belongs to the steroid hormone receptor superfamily, and plays a role in the blastoderm and nervous system development in Drosophila. Recently, several FTZ-F1 family genes have been cloned in several species. SF-1/Ad4BPs have been identified as master regulators controlling steroidogenic P-450 genes in mammals and are considered to be the mammalian homologues of FTZ-F1. Moreover, SF-1/Ad4BP plays a critical role in the sexual differentiation of gonads in mammals. In vertebrates, except for mammals, the functional homologue of SF-1/Ad4BP has not been identified before. Herein, we cloned two chicken cDNAs (OR2.0 and OR2.1), which encode putative FTZ-F1 family receptors, by reverse transcriptase-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE). OR2.1 consists of 3255 bp, is expressed in the adrenal glands and gonads, and is considered to be the chicken counterpart of mammalian SF-1/Ad4BP. However, OR2.0 consists of 2945 bp, is expressed in the livers and the adrenal glands, and is considered to be the chicken counterpart of mouse LRH-1, which is a member of the FTZ-F1 family in mammals.

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