Thu, 21 Aug 2008 07:07:30 BST CiteULike: inesdesantiago's library [315 articles] http://www.citeulike.org/user/inesdesantiago/article/1899829 CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/inesdesantiago/article/1899829 <i>Cell, Vol. 120, No. 2. (28 January 2005), pp. 169-181.</i><br /><br />We mapped histone H3 lysine 4 di- and trimethylation and lysine 9/14 acetylation across the nonrepetitive portions of human chromosomes 21 and 22 and compared patterns of lysine 4 dimethylation for several orthologous human and mouse loci. Both chromosomes show punctate sites enriched for modified histones. Sites showing trimethylation correlate with transcription starts, while those showing mainly dimethylation occur elsewhere in the vicinity of active genes. Punctate methylation patterns are also evident at the cytokine and IL-4 receptor loci. The Hox clusters present a strikingly different picture, with broad lysine 4-methylated regions that overlay multiple active genes. We suggest these regions represent active chromatin domains required for the maintenance of Hox gene expression. Methylation patterns at orthologous loci are strongly conserved between human and mouse even though many methylated sites do not show sequence conservation notably higher than background. This suggests that the DNA elements that direct the methylation represent only a small fraction of the region or lie at some distance from the site. Genomic Maps and Comparative Analysis of Histone Modifications in Human and Mouse Bradley Bernstein Michael Kamal Kerstin Lindblad-Toh Stefan Bekiranov Dione Bailey Dana Huebert Scott Mcmahon Elinor Karlsson Edward Kulbokas Thomas Gingeras Stuart Schreiber Eric Lander doi:10.1016/j.cell.2005.01.001 Cell, Vol. 120, No. 2. (28 January 2005), pp. 169-181. 2007-11-11T21:04:42-00:00 2005 Cell 120 2 169 181 integration