dc.creator | Gayek, Anna Sophia | |
dc.date.accessioned | 2020-08-22T00:11:36Z | |
dc.date.available | 2016-09-26 | |
dc.date.issued | 2016-03-30 | |
dc.identifier.uri | https://etd.library.vanderbilt.edu/etd-03282016-121934 | |
dc.identifier.uri | http://hdl.handle.net/1803/11635 | |
dc.description.abstract | Two processes influence the success of mitosis, the process by which eukaryotic cells divide their replicated genome into two new daughter cells. First, the cell must build a bipolar array of microtubules called the mitotic spindle, which is accomplished by microtubule sliding by the Kinesin-5 Eg5; second, a subset of those microtubules, called kinetochore-microtubules (K-MTs), must attach correctly to each chromosome. The stability of these K-MT attachments to the chromosome influences whether chromosomes will segregate correctly in anaphase, but an influence of K-MT stability on the ability of cells to build or maintain bipolar spindles had not been recognized. Here we show that human cell lines with high K-MT stability are better able to maintain bipolar spindles when Eg5 is inhibited compared to cell lines with low K-MT stability. Artificially stabilizing K-MTs promoted bipolarity maintenance, while destabilizing K-MTs undermined the maintenance of bipolarity. In addition, inhibition of the mitotic master-regulator cyclin-dependent kinase-1 (CDK-1) in the G2 phase of the cell cycle stabilized K-MTs after CDK-1 inhibition was relieved, which promoted bipolar spindle maintenance without Eg5 but undermined mitotic fidelity. These results indicate that the dynamics of K-MTs play a previously unappreciated role in determining the overall geometry of the mitotic spindle. | |
dc.format.mimetype | application/pdf | |
dc.subject | microtubule | |
dc.subject | kinetochore | |
dc.subject | mitosis | |
dc.title | Not Just for Pulling Chromosomes: The Role of Kinetochore-Microtubules in Enforcing Bipolarity of the Human Mitotic Spindle | |
dc.type | dissertation | |
dc.contributor.committeeMember | Ryoma Ohi | |
dc.contributor.committeeMember | Kathleen L. Gould | |
dc.contributor.committeeMember | Chin Chiang | |
dc.contributor.committeeMember | Matthew J. Lang | |
dc.type.material | text | |
thesis.degree.name | PHD | |
thesis.degree.level | dissertation | |
thesis.degree.discipline | Cell and Developmental Biology | |
thesis.degree.grantor | Vanderbilt University | |
local.embargo.terms | 2016-09-26 | |
local.embargo.lift | 2016-09-26 | |
dc.contributor.committeeChair | Irina Kaverina | |