title: Transcriptional repression by the methyl-CpG-binding protein MeCP2 involves a histone deacetylase complex.
abstract: Cytosine residues in the sequence 5'CpG (cytosine-guanine) are often postsynthetically methylated in animal genomes. CpG methylation is involved in long-term silencing of certain genes during mammalian development and in repression of viral genomes. The methyl-CpG-binding proteins MeCP1 and MeCP2 interact specifically with methylated DNA and mediate transcriptional repression. Here we study the mechanism of repression by MeCP2, an abundant nuclear protein that is essential for mouse embryogenesis. MeCP2 binds tightly to chromosomes in a methylation-dependent manner. It contains a transcriptional-repression domain (TRD) that can function at a distance in vitro and in vivo. We show that a region of MeCP2 that localizes with the TRD associates with a corepressor complex containing the transcriptional repressor mSin3A and histone deacetylases. Transcriptional repression in vivo is relieved by the deacetylase inhibitor trichostatin A, indicating that deacetylation of histones (and/or of other proteins) is an essential component of this repression mechanism. The data suggest that two global mechanisms of gene regulation, DNA methylation and histone deacetylation, can be linked by MeCP2.
authors.affiliation: Institute of Cell and Molecular Biology, University of Edinburgh, UK.
authors.forename: X
authors.initials: X
authors.lastname: Nan
authors.forename: H H
authors.initials: HH
authors.lastname: Ng
authors.forename: C A
authors.initials: CA
authors.lastname: Johnson
authors.forename: C D
authors.initials: CD
authors.lastname: Laherty
authors.forename: B M
authors.initials: BM
authors.lastname: Turner
authors.forename: R N
authors.initials: RN
authors.lastname: Eisenman
authors.forename: A
authors.initials: A
authors.lastname: Bird
mesh_terms: D000107:Acetylation; D000595:Amino Acid Sequence; D000818:Animals; D002868:Chromosomal Proteins, Non-Histone; D019175:DNA Methylation; D004268:DNA-Binding Proteins / Q000378:metabolism*; D015226:Dinucleoside Phosphates / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases / Q000378:metabolism*; D006657:Histones / Q000378:metabolism; D006877:Hydroxamic Acids / Q000494:pharmacology; D007739:L Cells; D051783:Methyl-CpG-Binding Protein 2; D051379:Mice; D008969:Molecular Sequence Data; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012097:Repressor Proteins / Q000378:metabolism*; D056264:Sin3 Histone Deacetylase and Corepressor Complex; D014158:Transcription, Genetic; D014162:Transfection
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D015226:Dinucleoside Phosphates; D004791:Enzyme Inhibitors; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases; D006657:Histones; D006877:Hydroxamic Acids; D051783:Methyl-CpG-Binding Protein 2; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D056264:Sin3 Histone Deacetylase and Corepressor Complex; C497393:Mecp2 protein, mouse; C099683:SIN3A transcription factor; C015772:CpG dinucleotide; C012589:trichostatin A