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Simultaneous analysis of conformation and transcription of A and B groups of vitellogenin genes in male and female Xenopus during primary and secondary activation by estrogen.
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In male Xenopus, primary estradiol administration results in noncoordinate activation in the liver of the A and B groups of vitellogenin genes, both as judged by transcription and DNase I sensitivity in isolated nuclei, B group genes being activated preferentially in the first 20 hr. Secondary induction in males or "primary" induction in females results in a coordinate and equal transcription of these two groups of genes. The elevated transcriptional activity following primary estrogen stimulation returns to low levels rapidly but the high DNase I sensitivity of these genes persists for 2-3 months. A non-coordinate activation of the A and B groups of vitellogenin genes is however re-established in response to a second administration of estradiol 8 months after primary stimulation of male Xenopus.
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