A major epigenetic programming mechanism guided by piRNAs.
A major epigenetic programming mechanism guided by piRNAs.
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DOI:
10.1016/j.devcel.2013.01.023
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发表时间:
2013-03-11
影响因子:
11.8
通讯作者:
Lin, Haifan
中科院分区:
文献类型:
--
作者:
Huang, Xiao A.;Yin, Hang;Sweeney, Sarah;Raha, Debasish;Snyder, Michael;Lin, Haifan
A central enigma in epigenetics is how epigenetic factors are guided to specific genomic sites for their function. Previously, we reported that a Piwi-piRNA complex associates with the piRNA-complementary site in the Drosophila genome and regulate its epigenetic state. Here, we report that Piwi-piRNA complexes bind to numerous piRNA-complementary sequences throughout the genome, implicating piRNAs as a major mechanism that guide Piwi and Piwi-associated epigenetic factors to program the genome. To test this hypothesis, we demonstrate that inserting piRNA-complementary sequences to an ectopic site leads to Piwi, HP1a, and Su(var)3–9 recruitment to the site as well as H3K9me2/3 enrichment and reduced RNA Polymerase II association, indicating that piRNA is both necessary and sufficient to recruit Piwi and epigenetic factors to specific genomic sites. Piwi deficiency drastically changed the epigenetic landscape and Polymerase II profile throughout the genome, revealing the Piwi-piRNA mechanism as a major epigenetic programming mechanism in Drosophila.
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