Abstract
In interphase eukaryotic nuclei, chromatin is folded to form a higher-order topological structure. The spatial organization of such chromatin domain has an important impact on the regulation of gene expression. As a key architectural structural protein, CTCF (CCCTC-binding factor) plays an important role in the formation of chromatin three-dimensional chromatin structure. CTCF can also bind to many insulator elements in the genome and insulate enhancers from activating target genes via modulating remote chromatin interactions. A recent study by Dr. Chunliang Li and his team at St. Jude Children's Research Hospital in the United States showed that when CTCF was acutely degraded, significant changes were found in the three-dimensional structure of chromatin. The mechanism by which CTCF binding sites function as insulator elements was investigated by Prof. Qiang Wu's team at Institute of Systems Biomedicine and Shanghai Jiao Tong University in China and Prof. Bing Ren's team at Ludwig Institute for Cancer Research in the United States. Here we mainly review and discuss some of these latest progresses.
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