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Vol. 15, Issue 7, 3296-3308, July 2004
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Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724
Submitted March 22, 2004;
Revised April 30, 2004;
Accepted May 3, 2004
Monitoring Editor: Joseph Gall
Two different condensin complexes make distinct contributions to metaphase chromosome architecture in vertebrate cells. We show here that the spatial and temporal distributions of condensins I and II are differentially regulated during the cell cycle in HeLa cells. Condensin II is predominantly nuclear during interphase and contributes to early stages of chromosome assembly in prophase. In contrast, condensin I is sequestered in the cytoplasm from interphase through prophase and gains access to chromosomes only after the nuclear envelope breaks down in prometaphase. The two complexes alternate along the axis of metaphase chromatids, but they are arranged into a unique geometry at the centromere/kinetochore region, with condensin II enriched near the inner kinetochore plate. This region-specific distribution of condensins I and II is severely disrupted upon depletion of Aurora B, although their association with the chromosome arm is not. Depletion of condensin subunits causes defects in kinetochore structure and function, leading to aberrant chromosome alignment and segregation. Our results suggest that the two condensin complexes act sequentially to initiate the assembly of mitotic chromosomes and that their specialized distribution at the centromere/kinetochore region may play a crucial role in placing sister kinetochores into the back-to-back orientation.
Abbreviations used: CAP, chromosome-associated polypeptide; siRNA, small interfering RNA; SMC, structural maintenance of chromosomes.
Online version of this article contains supporting material. Online version is available at www.molbiolcell.org.
* Corresponding author. E-mail address: hirano{at}cshl.org.
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