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Histone variant innovation in a rapidly evolving chordate lineage

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dc.contributor.author Moosmann, Alexandra
dc.contributor.author Campsteijn, Coen
dc.contributor.author Jansen, Pascal W. T. C.
dc.contributor.author Nasrallah, Carole
dc.contributor.author Raasholm, Martina
dc.contributor.author Stunnenberg, Henk G
dc.contributor.author Thompson, Eric M.
dc.date.accessioned 2012-01-23T14:15:39Z
dc.date.available 2012-01-23T14:15:39Z
dc.date.issued 2011-07-15
dc.identifier.citation BMC Evolutionary Biology 2011, 11:208 en
dc.identifier.issn 1471-2148
dc.identifier.uri http://dx.doi.org/10.1186/1471-2148-11-208
dc.identifier.uri http://hdl.handle.net/1956/5507
dc.description.abstract Background: Histone variants alter the composition of nucleosomes and play crucial roles in transcription, chromosome segregation, DNA repair, and sperm compaction. Modification of metazoan histone variant lineages occurs on a background of genome architecture that shows global similarities from sponges to vertebrates, but the urochordate, Oikopleura dioica, a member of the sister group to vertebrates, exhibits profound modification of this ancestral architecture. Results: We show that a histone complement of 47 gene loci encodes 31 histone variants, grouped in distinct sets of developmental expression profiles throughout the life cycle. A particularly diverse array of 15 male-specific histone variants was uncovered, including a testes-specific H4t, the first metazoan H4 sequence variant reported. Universal histone variants H3.3, CenH3, and H2A.Z are present but O. dioica lacks homologs of macroH2A and H2AX. The genome encodes many H2A and H2B variants and the repertoire of H2A.Z isoforms is expanded through alternative splicing, incrementally regulating the number of acetylatable lysine residues in the functionally important N-terminal “charge patch”. Mass spectrometry identified 40 acetylation, methylation and ubiquitylation posttranslational modifications (PTMs) and showed that hallmark PTMs of “active” and “repressive” chromatin were present in O. dioica. No obvious reduction in silent heterochromatic marks was observed despite high gene density in this extraordinarily compacted chordate genome. Conclusions: These results show that histone gene complements and their organization differ considerably even over modest phylogenetic distances. Substantial innovation among all core and linker histone variants has evolved in concert with adaptation of specific life history traits in this rapidly evolving chordate lineage. Keywords: histone complement, DNA repair, urochordate, posttranslational modification, endocycle, gametogenesis, testes, H2A.Z, alternative splicing en
dc.language.iso eng en
dc.publisher BioMed Central en
dc.rights Copyright 2011 Moosmann et al; licensee BioMed Central Ltd. en
dc.rights.uri http://creativecommons.org/licenses/by/2.0/ en
dc.title Histone variant innovation in a rapidly evolving chordate lineage en
dc.type Peer reviewed en
dc.type Journal article en
dc.subject.nsi VDP::Mathematics and natural science: 400::Basic biosciences: 470::Genetics and genomics: 474 en
dc.subject.nsi VDP::Mathematics and natural science: 400::Basic biosciences: 470 en
dc.type.version publishedVersion en


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Copyright 2011 Moosmann et al; licensee BioMed Central Ltd. Except where otherwise noted, this item's license is described as Copyright 2011 Moosmann et al; licensee BioMed Central Ltd.

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