A pathway for mitotic chromosome formation
Top Cited Papers
- 9 February 2018
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 359 (6376), 652-+
- https://doi.org/10.1126/science.aao6135
Abstract
Mitotic chromosomes fold as compact arrays of chromatin loops. To identify the pathway of mitotic chromosome formation, we combined imaging and Hi-C analysis of synchronous DT40 cell cultures with polymer simulations. Here we show that in prophase, the interphase organization is rapidly lost in a condensin-dependent manner, and arrays of consecutive 60-kilobase (kb) loops are formed. During prometaphase, similar to 80-kb inner loops are nested within similar to 400-kb outer loops. The loop array acquires a helical arrangement with consecutive loops emanating from a central "spiral staircase" condensin scaffold. The size of helical turns progressively increases to similar to 12 megabases during prometaphase. Acute depletion of condensin I or II shows that nested loops form by differential action of the two condensins, whereas condensin II is required for helical winding.Funding Information
- National Science Foundation (1504942)
- National Institutes of Health (DK107980)
- Howard Hughes Medical Institute
- National Human Genome Research Institute (HG003143)
- Wellcome Trust (107022)
- Sumitomo Foundation
- Canon Foundation for Scientific Research
- Mochida Memorial Foundation for Medical and Pharmaceutical Research
- JSPS (16K15095)
- SGH Foundation
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