Interrogation of the dynamic properties of higher-order heterochromatin using CRISPR-dCas9.
Interrogation of the dynamic properties of higher-order heterochromatin using CRISPR-dCas9.
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DOI:
10.1016/j.molcel.2021.07.034
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发表时间:
2021-10-21
期刊:
影响因子:
16
通讯作者:
Qi LS
中科院分区:
文献类型:
--
作者:
Gao Y;Han M;Shang S;Wang H;Qi LS
Eukaryotic chromosomes feature large regions of compact, repressed heterochromatin hallmarked by Heterochromatin Protein 1 (HP1). HP1 proteins play multi-faceted roles in shaping heterochromatin, and in cells, HP1 tethering to individual gene promoters leads to epigenetic modifications and silencing. However, emergent properties of HP1 at supranucleosomal scales remain difficult to study in cells due to lack of appropriate tools. Here, we develop CRISPR-Engineered Chromatin Organization (EChO), combining live cell CRISPR imaging with inducible large-scale recruitment of chromatin proteins to native genomic targets. We demonstrate that human HP1α tiling across kilobase-scale genomic DNA forms novel contacts with natural heterochromatin, integrates two distantly targeted regions, and reversibly changes chromatin from a diffuse to compact state. The compact state exhibits delayed disassembly kinetics and represses transcription across over 600 kilobases. These findings support a polymer model of HP1α-mediated chromatin regulation and highlight the utility of CRISPR-EChO in studying supranucleosomal chromatin organization in living cells. Technologies to manipulate and study 3D genome organization in living cells remain scarce. Gao et al. develop a CRISPR/dCas9-based approach for inducibly tiling chromatin proteins across kilobase-scale regions of the chromosome, uncovering the direct role of HP1a in dynamically mediating long-range chromatin interactions, chromatin compaction, and transcriptional repression.
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