Abstract

Administration of 17β-estradiol to reproductively active male rainbow trout results in the induction of synthesis of two estrogen-responsive mRNA, vitellogenin (VG) and ULER2, to high levels. The complementary DNA (cDNA) of these two mRNA were prepared by molecular cloning. Two genomic DNA fragments generated by EcoRI digestion of trout genomic DNA showed hybridization to VG cDNA. A quantitative RNA dot blot hybridization method was adopted for the determination of levels of estrogen-responsive mRNA in livers of male trout after 17β-estradiol stimulation. This assay was used to determine the dose-response relationship and the time course of estrogen-responsive mRNA accumulation in juvenile fish.

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