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Identifying proteins bound to native mitotic ESC chromosomes reveals chromatin repressors are important for compaction

Reputable Mentor II
Reputable Mentor II
Dounia Djeghloul, Bhavik Patel, Holger Kramer, Andrew Dimond, Chad Whilding, Karen Brown, Anne-Céline Kohler, Amelie Feytout, Nicolas Veland, James Elliott, Tanmay A. M. Bharat, Abul K. Tarafder, Jan Löwe, Bee L. Ng, Ya Guo, Jacky Guy, Miles K. Huseyin, Robert J. Klose, Matthias Merkenschlager & Amanda G. Fisher
Nature Communications volume 11, Article number: 4118 (2020)
Epigenetic information is transmitted from mother to daughter cells through mitosis. Here, to identify factors that might play a role in conveying epigenetic memory through cell division, we report on the isolation of unfixed, native chromosomes from metaphase-arrested cells using flow cytometry and perform LC-MS/MS to identify chromosome-bound proteins. A quantitative proteomic comparison between metaphase-arrested cell lysates and chromosome-sorted samples reveals a cohort of proteins that were significantly enriched on mitotic ESC chromosomes. These include pluripotency-associated transcription factors, repressive chromatin-modifiers such as PRC2 and DNA methyl-transferases, and proteins governing chromosome architecture. Deletion of PRC2, Dnmt1/3a/3b or Mecp2 in ESCs leads to an increase in the size of individual mitotic chromosomes, consistent with de-condensation. Similar results were obtained by the experimental cleavage of cohesin. Thus, we identify chromosome-bound factors in pluripotent stem cells during mitosis and reveal that PRC2, DNA methylation and Mecp2 are required to maintain chromosome compaction.

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‎10-15-2021 08:39 AM
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