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Regular pattern of karyotypic alterations accompanying gene amplification in Djungarian hamster cells: study of colchicine, adriablastin, and methotrexate resistance

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Abstract

Chromosomal analysis of 26 Djungarian hamster cell lines obtained from 11 independent clones and possessing different levels of resistance to colchicine or adriablastin as a consequence of gene amplification revealed regular patterns in the karyotypic changes that accompanied the development of drug resistance. Usually the sequence of karyotypic changes was as follows: first an additional chromosome 4 appeared; then single unpaired small chromatin bodies (SCBs) arose; later in the middle part of the long arm of one of three chromosomes 4 long homogeneously staining regions (HSRs) and double minute chromosomes (DMs) were formed; and finally in the most resistant variants large clusters of SCBs appeared. The emergence of the clusters of the SCBs correlated well with the occurrence of autonomously replicating, amplified DNA sequences. In contrast to DNA of the HSRs the DNA of the SCBs could replicate outside the S-phase of the cell cycle. When kept in a non-selective medium, the cells gradually lost their resistance to colchicine: 1%–4% of the cells lost the capacity to form colonies in the selective medium independently of the pattern of location in them of amplified genes (in chromosomal HSRs, SCBs, or DMs). Loss of drug resistance was accompanied by disappearance of the chromosomal HSRs, SCBs, and DMs. Chromosomal analysis of the set of methotrexate-resistant Djungarian hamster cell lines indicated the following karyotypic evolution: first the additional material on the distal part of one of two chromosomes 3 appeared; then the light HSRs were formed on the distal part of one of two chromosomes 4; later clusters of SCBs and HSRs arose on the distal part of the short arm of chromosome 3. Probably the amplification of different genes is characterized by specific patterns of karyotypic alterations.

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Authors and Affiliations

  1. Laboratory of Tumor Cell Genetics, Institute of Cancerogenesis, All-Union Cancer Research Centre, Academy of Medical Sciences of the USSR, Kashirskoe shousse 24, 115478, Moscow, USSR

    B. P. Kopnin & J. S. Massino

  2. Laboratory of Immunology of Oncoviruses, Institute of Cancerogenesis, All-Union Cancer Research Centre, Academy of Medical Sciences of the USSR, Kashirskoe shousse 24, 115478, Moscow, USSR

    A. V. Gudkov

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  1. B. P. Kopnin
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  2. J. S. Massino
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  3. A. V. Gudkov
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Kopnin, B.P., Massino, J.S. & Gudkov, A.V. Regular pattern of karyotypic alterations accompanying gene amplification in Djungarian hamster cells: study of colchicine, adriablastin, and methotrexate resistance. Chromosoma 92, 25–36 (1985). https://doi.org/10.1007/BF00327242

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  • DOI: https://doi.org/10.1007/BF00327242

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