Biosphere Origin and Evolution (Springer by Dobretsov

By Dobretsov

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Targeting and Relocation of Nuclear Matrix Proteins to the Mitotic Apparatus In addition to NuMA, many nuclear matrix-derived proteins leave the nucleus at the time of nuclear envelope dissolution and make their way to various zones within the mitotic apparatus. Although little is known about the mechanism of how these proteins become targeted to various spindle sites, most end up in one of several zones including the chromosome scaffold, perichromosome region, centromere/kinetochore region, midzone, midbody, and spindle poles (Fig.

During mitosis, fA12 antigen becomes redistributed to the perichromosome region as well as to the spindle pole regions. Again, fA12 decorated 34 D. HE E r AL. similar fibrogranular material that attached to the filaments surrounding and interconnecting chromosomes and to similar material that surrounds the centrioles. At the end of telophase, fA12 antigens became relocated to the dense midbody leaving a central unstained spot. It is likely that when cells progressed into mitosis, some of the filaments that connected chromosomes in interphase were retained and formed perichromosome fibrils representing a persistent form of the nuclear matrix.

1989), has led to the model that top0 I1 resides at the base of the chromatin loops to anchor the DNA responsible for the radial loop organization of chromatin in mitotic chromosomes. This view, however, has been challenged by several other observations. First, the cellular content of this enzyme varies widely with different stages of proliferation and cell cycle. The amount of top0 I1 decreases rapidly and dramatically in cells that cease to proliferate. For instance, there are 7 X lo4copies of top0 I1 per chicken erythroblast, whereas less than 300 copies are found in nonproliferating erythrocytes during erythropoiesis (Heck and Earnshaw, 1986).

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