Mitotic chromosome segregation is partly achieved by interaction between microtubules (MTs)and the kinetochores of sister chromatids. The precise mechanism of the interaction between kinetochores and MTs remains unclear. We studied this process in fission yeastSchizosaccharomyces pombe by analyzing interaction between genes encoding kinetochore components, such as DNA-binding protein Abp1, and genes whose protein products affect the dynamics of MTs, such as cofactor D of tubulin dimer assembly. Analysis of cell growth and minichromosome loss frequency has demonstrated that mutations in the gene of cofactor D, especially mutationtsm1-512, increase the rate of minichromosome loss and the sensitivity to changes in Abp1 concentration in cells compared to wild-type cells. This suggests that these mutants are defective in some specific, but still unknown aspect of kinetochore–MT interaction.
Russian Journal of Genetics – Springer Journals
Published: Oct 18, 2004
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