| Autor: |
Stephens AD; Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA., Haggerty RA, Vasquez PA, Vicci L, Snider CE, Shi F, Quammen C, Mullins C, Haase J, Taylor RM 2nd, Verdaasdonk JS, Falvo MR, Jin Y, Forest MG, Bloom K |
| Jazyk: |
angličtina |
| Zdroj: |
The Journal of cell biology [J Cell Biol] 2013 Mar 18; Vol. 200 (6), pp. 757-72. |
| DOI: |
10.1083/jcb.201208163 |
| Abstrakt: |
The mechanisms by which sister chromatids maintain biorientation on the metaphase spindle are critical to the fidelity of chromosome segregation. Active force interplay exists between predominantly extensional microtubule-based spindle forces and restoring forces from chromatin. These forces regulate tension at the kinetochore that silences the spindle assembly checkpoint to ensure faithful chromosome segregation. Depletion of pericentric cohesin or condensin has been shown to increase the mean and variance of spindle length, which have been attributed to a softening of the linear chromatin spring. Models of the spindle apparatus with linear chromatin springs that match spindle dynamics fail to predict the behavior of pericentromeric chromatin in wild-type and mutant spindles. We demonstrate that a nonlinear spring with a threshold extension to switch between spring states predicts asymmetric chromatin stretching observed in vivo. The addition of cross-links between adjacent springs recapitulates coordination between pericentromeres of neighboring chromosomes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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