Identifying the motive force is central to explaining chromosome
motions during mitosis. Presently, there is no consensus on what it
is. The author has proposed a minimal assumptions model for the
dynamics of post-attachment chromosome motions based on nanoscale
electrostatics. Given the electrical properties of tubulin and the
dynamic instability of microtubules, it is possible to account for
prometaphase post-attachment, metaphase, and anaphase chromosome
motions within a comprehensive model. The model addresses all of
the following in a unified manner: Efficiency of aster and spindle
assembly and the motive force for the motion of asters and forming
half-spindles. Chromatid pair attachment. Motion of monovalently
attached chromatid pairs. Motion of bivalently attached chromatid
pairs and chromosome congression. Metaphase chromatid pair
oscillations. Chromatid separation and anaphase-A chromosome
motion. Anaphase-B pole separation. An ab-initio calculation of the
maximum tension force exerted by a microtubule during mitosis that
falls within the experimental range. Poleward force generation of
chromosomes at poles with associated microtubule flux.
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