PMID- 17202157 OWN - NLM STAT- MEDLINE DCOM- 20070312 LR - 20181113 IS - 1362-4962 (Electronic) IS - 0305-1048 (Print) IS - 0305-1048 (Linking) VI - 35 IP - 3 DP - 2007 TI - DNA methylation immediately adjacent to active histone marking does not silence transcription. PG - 801-11 AB - Active promoters generally contain histone H3/H4 hyperacetylation and tri-methylation at H3 lysine 4, whereas repressed promoters are associated with DNA methylation. Here we show that the repressed erythroid-specific carbonic anhydrase II (CAII) promoter has active histone modifications localized around the transcription start, while high levels of CpG methylation are present directly upstream from these active marks. Despite the presence of active histone modifications, the repressed promoter requires hormone-induced activation for efficient preinitiation complex assembly. Transient and positional changes in histone H3/H4 acetylation and local changes in nucleosome density are evident during activation, but the bipartite epigenetic code is stably maintained. Our results suggest that active histone modifications may prevent spreading of CpG methylation towards the promoter and show that repressive DNA methylation immediately adjacent to a promoter does not necessarily repress transcription. FAU - Brinkman, Arie B AU - Brinkman AB AD - Department of Molecular Biology, Nijmegen Centre for Molecular Life Sciences, Radboud University, The Netherlands. FAU - Pennings, Sebastiaan W C AU - Pennings SW FAU - Braliou, Georgia G AU - Braliou GG FAU - Rietveld, Luc E G AU - Rietveld LE FAU - Stunnenberg, Hendrik G AU - Stunnenberg HG LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20070103 PL - England TA - Nucleic Acids Res JT - Nucleic acids research JID - 0411011 RN - 0 (Histones) RN - 0 (Nucleosomes) RN - 0 (Transcription Factors) RN - 06LU7C9H1V (Triiodothyronine) RN - EC 4.2.1.- (Carbonic Anhydrase II) SB - IM MH - Acetylation MH - Animals MH - Carbonic Anhydrase II/genetics/metabolism MH - Cell Line MH - *CpG Islands MH - *DNA Methylation MH - Erythroid Precursor Cells/metabolism MH - *Gene Silencing MH - Histones/chemistry/*metabolism MH - Nucleosomes/metabolism MH - *Promoter Regions, Genetic MH - Transcription Factors/metabolism MH - Transcription, Genetic/drug effects MH - Triiodothyronine/pharmacology PMC - PMC1807972 EDAT- 2007/01/05 09:00 MHDA- 2007/03/14 09:00 PMCR- 2007/01/03 CRDT- 2007/01/05 09:00 PHST- 2007/01/05 09:00 [pubmed] PHST- 2007/03/14 09:00 [medline] PHST- 2007/01/05 09:00 [entrez] PHST- 2007/01/03 00:00 [pmc-release] AID - gkl1014 [pii] AID - 10.1093/nar/gkl1014 [doi] PST - ppublish SO - Nucleic Acids Res. 2007;35(3):801-11. doi: 10.1093/nar/gkl1014. Epub 2007 Jan 3.