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. 1988 Aug;85(15):5516–5520. doi: 10.1073/pnas.85.15.5516

Transcription complexes that program Xenopus 5S RNA genes are stable in vivo.

M K Darby 1, M T Andrews 1, D D Brown 1
PMCID: PMC281788  PMID: 3399503

Abstract

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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Selected References

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