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Differential spiralization along mammalian mitotic chromosomes

I. BUdR-revealed differentiation in Chinese hamster chromosomes

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Abstract

Morphology of chromosomes replicating in the presence of 5-bromodeoxyuridine was studied using long-term cultures of Chinese hamster cells (line Blld-ii-FAF28). The cytological effect of the analog administered in various concentrations, at different stages of the S period, and during one and two successive mitotic cycles was studied. — The main cytological manifestation of the BUdR action consisted in spiralization delay of certain chromosome regions. The degree of the delay was dependent on the time interval between the introduction of the agent and mitosis, as well as on the agent's concentration. With prolongation of the interval, the spiralization delay diminished and disappeared being therefore always observable only in late replicating chromosome regions. Increased concentration of BUdR (in the range of 25 to 400 μg/ml) produced enhancement of the delay of chromosome spiralization. — After two successive reproduction cycles in the presence of BUdR, a great number of metaphases contained chromosomes the sister chromatids of which showed unequal spiralization delay. Autoradiography of 3H-BUdR distribution showed that the sister chromatid with a more pronounced underspiralization corresponds to the chromatid incorporating BUdR into both strands of the DNA molecule. — Mechanisms of the effect observed, as well as chemical influence on chromosome spiralization as a usefull tool of displaying linear chromosome differentiation, are discussed.

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Authors and Affiliations

  1. Laboratory of General Cytogenetics, Institute of Medical Genetics Academy of Medical Sciences of USSR, Moscow

    A. F. Zakharov & N. A. Egolina

  2. Laboratory of Cytogenetics, Institute of Experimental and Clinical Oncology Academy of Medical Sciences of USSR, Moscow

    A. F. Zakharov & N. A. Egolina

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  1. A. F. Zakharov
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  2. N. A. Egolina
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Zakharov, A.F., Egolina, N.A. Differential spiralization along mammalian mitotic chromosomes. Chromosoma 38, 341–365 (1972). https://doi.org/10.1007/BF00320156

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