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Journal of Cell Science, Vol 107, Issue 8 2055-2063, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

The role of transcription factors, chromatin structure and DNA replication in 5 S RNA gene regulation

AP Wolffe
Laboratory of Molecular Embryology, National Institute of Child Health and Human Development, NIH, Bethesda, MD 20892.

Differential expression of the oocyte and somatic 5 S RNA genes during Xenopus development can be explained by changes in transcription factor and histone interactions with the two types of gene. Both factors and histones bind 5 S RNA genes with specificity. Protein-protein interactions determine the stability of potentially transcriptionally active or repressed nucleoprotein complexes. A decline in transcription factor abundance, differential binding of transcription factors to oocyte and somatic 5 S genes, and increased competition with the histones for association with DNA during early embryogenesis, can account for the developmental decision to selectively repress the oocyte genes, while retaining the somatic genes in the transcriptionally active state. The 5 S ribosomal genes of Xenopus are perhaps the simplest eukaryotic genes to show regulated expression during development. A large multigene family (oocyte 5 S DNA) is transcriptionally active in oocytes but is repressed in somatic cells, whereas a small multigene family (somatic 5 S DNA) is active in both cell types. A potential molecular mechanism to explain the developmental switch that turns off oocyte 5 S DNA transcription has been experimentally reconstructed in vitro and more recently tested in vivo. Central to this mechanism is the specific association of both transcription factors and histones with 5 S RNA genes. How the interplay of histones and transcription factors is thought to affect transcription, and how their respective contributions might change during development from an oocyte, to an embryo and eventually to a somatic cell is the focus of this review.
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© The Company of Biologists Ltd 1994