Evolution of H3K27me3-marked chromatin is linked to gene expression evolution and to patterns of gene duplication and diversification.

Evolution of H3K27me3-marked chromatin is linked to gene expression evolution and to patterns of gene duplication and diversification.
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DOI:
10.1101/gr.162008.113
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发表时间:
2014-07
期刊:
影响因子:
7
通讯作者:
White KP
White KP
中科院分区:
生物学1区
文献类型:
--
作者:
Arthur RK;Ma L;Slattery M;Spokony RF;Ostapenko A;Nègre N;White KP

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Histone modifications are critical for the regulation of gene expression, cell type specification, and differentiation. However, evolutionary patterns of key modifications that regulate gene expression in differentiating organisms have not been examined. Here we mapped the genomic locations of the repressive mark histone 3 lysine 27 trimethylation (H3K27me3) in four species of Drosophila, and compared these patterns to those in C. elegans. We found that patterns of H3K27me3 are highly conserved across species, but conservation is substantially weaker among duplicated genes. We further discovered that retropositions are associated with greater evolutionary changes in H3K27me3 and gene expression than tandem duplications, indicating that local chromatin constraints influence duplicated gene evolution. These changes are also associated with concomitant evolution of gene expression. Our findings reveal the strong conservation of genomic architecture governed by an epigenetic mark across distantly related species and the importance of gene duplication in generating novel H3K27me3 profiles.
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