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. 1990 Dec;10(12):6674–6682. doi: 10.1128/mcb.10.12.6674

Activation of chromosomal vitellogenin genes in Xenopus oocytes by pure estrogen receptor and independent activation of albumin genes.

E A McKenzie 1, N A Cridland 1, J Knowland 1
PMCID: PMC362945  PMID: 2247078

Abstract

We generate pure estrogen receptor protein in Xenopus oocytes by injecting them with estrogen receptor mRNA synthesized in vitro. A chromosomal vitellogenin gene, which normally responds to estrogen only in liver cells, is activated. Primer extension shows that initiation is accurate, and ribonuclease mapping shows that the first exon is correctly spliced out of the initial transcript. Long transcripts are produced, one being equal in length to poly(A)- vitellogenin mRNA. Immunochemical estimates of receptor levels in the oocyte nuclei suggest that pure receptor, acting alone, cannot activate oocyte vitellogenin genes unless unusually large amounts are present. However, when a receptor-free extract from liver cells is also injected, the amount of receptor required is reduced. Such an extract, but not pure receptor, can also activate albumin genes in oocytes.

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Selected References

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