Abstract
Most histones are assembled into nucleosomes behind the replication fork to package newly synthesized DNA, but some histones are deposited independent of replication. Replication-independent histone variants of H3 and H2A have evolved to participate in gene regulation, transcriptional elongation, chromosome segregation and DNA repair in almost all eukaryotes. Because histone variants are deposited on a chromatinized template, they replace canonical replication-coupled histones in processes that involve partial or complete unravelling of nucleosomes. The recent application of high-resolution profiling to histone variants thus provides a genome-wide view of active processes that disrupt chromatin. Replacement of a canonical histone with a variant can profoundly alter chromatin properties and erase histone modifications. As such, the epigenomic profiling of histone variants and nucleosome positioning reveals both nucleosome dynamics and the basic organization of the epigenome.
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Henikoff, S. (2009). Epigenetic Profiling of Histone Variants. In: Ferguson-Smith, A.C., Greally, J.M., Martienssen, R.A. (eds) Epigenomics. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9187-2_7
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