Abstract
A technique for the fixation of cells during live observation (Nicklas et al. 1979) was used to investigate chromosomes which were moving at the time of fixation. Chromosome fibres were reconstructed by tracking their microtubules in longitudinal serial sections. A considerable proportion of non-kinetochoric microtubules (free microtubules, fMTs) is skewed with respect to the fibre axis. These skew fMTs contribute to the degree of disorder. It was found that the difference in the relative proportion of skew fMTs between “active” fibres (oriented in the direction of movement) and “passive” fibres (oriented backwards) is significantly correlated with the chromosome velocity (correlation coefficient r=0.796, P=0.01). It can be concluded that the pulling force generated in the chromosome fibre is a function of skew fMTs.
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Steffen, W. Three-dimensional architecture of chromosome fibres in the crane fly: co-oriented autosomal bivalents and amphitelic sex univalents during prometaphase. Chromosoma 94, 107–114 (1986). https://doi.org/10.1007/BF00286988
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DOI: https://doi.org/10.1007/BF00286988