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Proc Natl Acad Sci U S A
1988 Aug 01;8515:5516-20.
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Transcription complexes that program Xenopus 5S RNA genes are stable in vivo.
Darby MK
,
Andrews MT
,
Brown DD
.
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The long-term stability of transcription complexes on 5S RNA genes has been demonstrated in vivo. Complexes on oocyte and somatic-type 5S RNA genes injected into Xenopus laevis oocyte nuclei are stable for at least 4 days. Tissue culture cells and mature erythrocytes have equivalent numbers of somatic 5S RNA genes programmed into transcription complexes, yet the former cell type has a greater than 50-fold higher cellular content of transcription factor IIIA (TFIIIA). Functional transcription complexes on somatic 5S RNA genes in nucleated erythrocytes of Xenopus are stable for weeks, perhaps months, even though a mature erythrocyte has less than two molecules of TFIIIA for each somatic 5S RNA gene. These findings strengthen our proposal that stable transcription complexes are a means of maintaining the differentiated state.
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