Publicado 6 números por año
ISSN Imprimir: 1045-4403
ISSN En Línea: 2162-6502
Indexed in
Evolution of Transcriptional Control from Prokaryotic Beginnings to Eukaryotic Complexities
SINOPSIS
Mechanisms for regulating gene transcription became increasingly complex as organisms evolved. In prokaryotes the relatively simple mechanism of repression is based on a few proteins that bind to specific DNA sequences in a ligand-dependent fashion. In eukaryotes large complexes that include ligand binding proteins regulate transcription. Lower eukaryotes developed an additional level of control based on protein complexes that include modifying enzymes. The DNA/histone complex, in combination with gene-specific transcriptional factors, is the basis of gene regulation in eukaryotes. Higher eukaryotes took regulation a level further by methylating CpGs in promoter sequences of DNA, thereby allowing binding of histone deacetylases and inhibiting transcription. Finally, long-lasting "superrepression" provides another mechanism for coordinate transcriptional regulation of large blocks of genes.
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