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Papers In Press, published online ahead of print February 7, 2006
Biology Department, Boston College, Chestnut Hill, MA 02467
Corresponding Author: annunzia{at}bc.edu
Histone posttranslational modifications that accompany DNA replication, nucleosome assembly and H2A/H2B exchange were examined in human tissue culture cells. Through microsequencing analysis and chromatin immunoprecipitation, it was found that a subset of newly synthesized H3.2/H3.3 is modified by acetylation and methylation at sites that correlate with transcriptional competence. Immunoprecipitation experiments suggest that cytosolic predeposition complexes purified from cells expressing Flag-H4 contain H3/H4 dimers, not tetramers. Studies of the deposition of newly synthesized H2A/H2B onto replicating and non-replicating chromatin demonstrated that H2A/H2B exchange takes place in chromatin regions that contain acetylated H4; however, there is no single pattern of H4 acetylation that accompanies exchange. H2A/H2B exchange is also largely independent of the deposition of replacement histone variant, H3.3. Finally, immunoprecipitation of nucleosomes replicated in the absence of de novo nucleosome assembly showed that histone modifications do not prevent the transfer of parental histones to newly replicated DNA, and thus have the potential to serve as means of epigenetic inheritance. Our experiments provide an in-depth analysis of the "histone code" associated with chromatin replication and dynamic histone exchange in human cells.
J. Biol. Chem, 10.1074/jbc.M512956200
Submitted on December 5, 2005
Revised on February 6, 2006
Accepted on February 7, 2006
Modifications of H3 And H4 during chromatin replication, nucleosome assembly, and histone exchange
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