有哪些信誉好的足球投注网站a high-resolution whole-genome map of key chromatin modifications in the adult drosophila melanogaster高分辨率全基因组地图的关键染色质的修改在成年人的黑腹果蝇.pdfVIP
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a high-resolution whole-genome map of key chromatin modifications in the adult drosophila melanogaster高分辨率全基因组地图的关键染色质的修改在成年人的黑腹果蝇
A High-Resolution Whole-Genome Map of Key Chromatin Modifications in the Adult Drosophila melanogaster 1,2 1¤a 3 3¤b 1 Hang Yin , Sarah Sweeney , Debasish Raha , Michael Snyder , Haifan Lin * 1 Yale Stem Cell Center and Department of Cell Biology, Yale School of Medicine, New Haven, Connecticut, United States of America, 2 Ottawa Hospital Research Institute, Ottawa, Canada, 3 Department of Molecular, Cell, and Developmental Biology, Yale University, New Haven, Connecticut, United States of America Abstract Epigenetic research has been focused on cell-type-specific regulation; less is known about common features of epigenetic programming shared by diverse cell types within an organism. Here, we report a modified method for chromatin immunoprecipitation and deep sequencing (ChIP–Seq) and its use to construct a high-resolution map of the Drosophila melanogaster key histone marks, heterochromatin protein 1a (HP1a) and RNA polymerase II (polII). These factors are mapped at 50-bp resolution genome-wide and at 5-bp resolution for regulatory sequences of genes, which reveals fundamental features of chromatin modification landscape shared by major adult Drosophila cell types: the enrichment of both heterochromatic and euchromatic marks in transposons and repetitive sequences, the accumulation of HP1a at transcription start sites with stalled polII, the signatures of histone code and polII level/position around the transcriptional start sites that predict both the mRNA level and functionality of genes, and the enrichment of elongating polII within exons at splicing junctions. These features, likely conserved among diverse epigenome
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