ChromEMT: Visualizing 3D chromatin structure and compaction in interphase and mitotic cells.
ChromEMT: Visualizing 3D chromatin structure and compaction in interphase and mitotic cells.
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DOI:
10.1126/science.aag0025
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发表时间:
2017-07-28
期刊:
影响因子:
--
通讯作者:
O'Shea CC
中科院分区:
文献类型:
--
作者:
Ou HD;Phan S;Deerinck TJ;Thor A;Ellisman MH;O'Shea CC
The chromatin structure of DNA determines genome compaction and activity in the nucleus. On the basis of in vitro structures and electron microscopy (EM) studies, the hierarchical model is that 11-nanometer DNA-nucleosome polymers fold into 30- and subsequently into 120- and 300-to 700-nanometer fibers and mitotic chromosomes. To visualize chromatin in situ, we identified a fluorescent dye that stains DNA with an osmiophilic polymer and selectively enhances its contrast in EM. Using ChromEMT (ChromEM tomography), we reveal the ultrastructure and three-dimensional (3D) organization of individual chromatin polymers, megabase domains, and mitotic chromosomes. We show that chromatin is a disordered 5- to 24-nanometer-diameter curvilinear chain that is packed together at different 3D concentration distributions in interphase and mitosis. Chromatin chains have many different particle arrangements and bend at various lengths to achieve structural compaction and high packing densities.
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