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pubmed-article:13679578pubmed:abstractTextCovalent modifications of histone tails modulate gene expression via chromatin organization. As examples, methylation of lysine 9 residues of histone H3 (H3) (H3-K9) is believed to repress transcription by compacting chromatin, whereas methylation of lysine 4 residues of H3 (H3-K4) is believed to activate transcription by relaxing chromatin. The Drosophila trithorax group protein absent, small, or homeotic discs 1 (ASH1) is involved in maintaining active transcription of many genes. Here we report that in extreme ash1 mutants, no H3-K4 methylation is detectable. Within the limits of our assays, this lack of detectable H3-K4 methylation implies that ASH1 is required for essentially all H3-K4 methylation that occurs in vivo. We report further that the 149-aa SET domain of ASH1 is sufficient for H3-K4 methylation in vitro. These findings support a model in which ASH1 is directly involved in maintaining active transcription by conferring a relaxed chromatin structure.lld:pubmed
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pubmed-article:13679578pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:13679578pubmed:articleTitleASH1, a Drosophila trithorax group protein, is required for methylation of lysine 4 residues on histone H3.lld:pubmed
pubmed-article:13679578pubmed:affiliationDepartment of Biology, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.lld:pubmed
pubmed-article:13679578pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:13679578pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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