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Proper centrosome separation is a prerequisite for positioning the bipolar spindle. Although studies demonstrate that microtubules (MTs) and their associated motors drive centrosome separation [1], the role of actin in centrosome separation remains less clear. Studies in tissue culture cells indicate that actin- and myosin-based cortical flow is primarily responsible for driving late centrosome separation...
The mechanisms that safeguard cells against chromosomal instability (CIN) are of great interest, as CIN contributes to tumorigenesis. To gain insight into these mechanisms, we studied the behavior of cells entering mitosis with damaged chromosomes. We used the endonuclease I-CreI to generate acentric chromosomes in Drosophila larvae. While I-CreI expression produces acentric chromosomes in the majority...
A longstanding enigma has been the origin of maternal centrosomes that facilitate parthenogenetic development in Hymenopteran insects. In young embryos, hundreds of microtubule-organizing centers (MTOCs) are assembled completely from maternal components [1–3]. Two of these MTOCs join the female pronucleus to set up the first mitotic spindle in unfertilized embryos and drive their development [2]....
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