Characterization of DNA rearrangements of N-myc gene amplification in three neuroblastoma cell lines by pulsed-field gel electrophoresis |
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Authors: | H Kato K Okamura Y Kurosawa T Kishikawa K Hashimoto |
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Institution: | Institute for Comprehensive Medical Science, Fujita-Gakuen Health University, Aichi, Japan. |
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Abstract: | We characterized N-myc gene amplification in three human neuroblastoma cell lines (IMR-32, TGW, GOTO). Rearrangements in long-range regions surrounding amplified N-myc genes were examined by pulsed-field gel electrophoresis. Since rare-cutting enzymes completely digested DNA at the middle of the N-myc gene, we were able to construct a physical map upstream and downstream of the germline N-myc gene, and to obtain information on restriction sites surrounding amplified N-myc genes. This method enables us to envisage the organization of amplified units over a long range. Digestion patterns differed considerably among the germline and the three cell lines, but were simple in each case. We estimated that the minimal distance between neighboring N-myc genes is at least several hundred kilobases. Our data suggest that amplification units contain several DNA fragments derived from ditterent loci, but that they are homogeneous. |
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Keywords: | Alu sequence Gene amplification Neuroblastoma Gene N-myc Pulsed-field gel electrophoresis |
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