The Polycomb group--no longer an exclusive club?
Polycomb group (PcG) proteins maintain silencing at target loci in higher eukaryotes but recent evidence suggests that about half of these proteins are also required for maintenance of activation at homeotic loci. We suggest that PcG and trithorax group response elements should acquire a new name, 'maintenance elements', to reflect the dual function of regulatory elements that bind both groups of proteins. New data suggest that there might be a functional link between PcG repression and cell-cycle regulation.
Department of Zoology, University of British Columbia, 6270 University Blvd., Vancouver, V6T 1Z4, British Columbia, Canada. brock@zoology.ubc.ca
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D000818:Animals; D001665:Binding Sites; D002453:Cell Cycle; D018797:Cell Cycle Proteins / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D029721:Drosophila Proteins; D018507:Gene Expression Regulation, Developmental; D006657:Histones / Q000378:metabolism; D006801:Humans; D019476:Insect Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D063150:Polycomb Repressive Complex 1; D063146:Polycomb-Group Proteins; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D020218:Response Elements; D014157:Transcription Factors
D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D006657:Histones; D019476:Insect Proteins; C066770:Pc protein, Drosophila; D063146:Polycomb-Group Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; C063460:Trl protein, Drosophila; D063150:Polycomb Repressive Complex 1