1. Fushi tarazu factor-1 mRNA and protein is expressed in steroidogenic and cholesterol metabolising tissues during different life stages in Arctic char (Salvelinus alpinus).
- Author
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von Hofsten J, Karlsson J, and Olsson PE
- Subjects
- Animals, Arctic Regions, DNA-Binding Proteins genetics, Embryo, Nonmammalian metabolism, Embryonic and Fetal Development, Fushi Tarazu Transcription Factors, Genitalia embryology, Homeodomain Proteins, Liver embryology, Pancreas embryology, RNA, Messenger metabolism, Receptors, Cytoplasmic and Nuclear, Steroidogenic Factor 1, Tissue Distribution, Transcription Factors genetics, Trout growth & development, Aging metabolism, Cholesterol metabolism, DNA-Binding Proteins metabolism, Steroids biosynthesis, Transcription Factors metabolism, Trout embryology, Trout metabolism
- Abstract
Fushi tarazu factor-1 (FTZ-F1) genes belong to the nuclear receptor family 5A (NR5A). The distribution pattern of NR5A genes in teleosts suggests that they control functions separate to, or in addition to, those of other vertebrates. In mammals NR5A1 genes, including steroidogenic factor-1 (SF-1), are primarily involved in steroidogenesis. NR5A2 contain the alpha-fetoprotein transcription factor (FTF) genes, which protect mammalian embryos against maternal estrogens, and are involved in cholesterol transfer and metabolism. In this study we have analysed the expression of two Arctic char FTZ-F1 forms belonging to the NR5A2 group. The expression starts during early development and the transcripts are present in embryonic liver/pancreas and gonadal regions. The genes are up-regulated during embryogenesis as the embryo develops towards hatch, as shown by increased mRNA and protein levels. In adult Arctic char the FTZ-F1 forms are primarily located to tissues involved in steroidogenesis as well as cholesterol metabolism. Thus, a division of NR5A into SF-1 (NR5A1) and FTF (NR5A2) specific functions does not appear to have occurred in teleosts.
- Published
- 2003
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