Abstract
The N-myc amplification of human neuroblastomas was characterized by the amplified DNA cloned from the cell line MC-NB-1 using the phenol emulsion reassociation technique (PERT). A number of PERT clones exhibiting amplification in this cell line were tested for amplification in other neuroblastoma cell lines. In almost all cell lines examined, only a few clones were co-amplified with N-myc and most of the others were exclusively amplified in a subset of the cell lines. The total aggregate size of theHind III fragment identified by the PERT clones was approximately 350 kb. Most of the PERT clones were mapped to human chromosome (chr) 2p23-2pter, where the N-myc gene is located. Four types of amplicons, the 100, 420, 480 and 520 kb fragments, shown to beNot I fragments, were identified by hexagonal field gel electrophoresis. Three fragments are ordered in a head-to-tail array, and the remaining fragment is either ordered in a tail-to-head array or something else. Despite the extremely unusual construction of the amplified sequences in this cell line as compared with others, there was a low degree of sequence heterogeneity among the amplicons within this cell line. These observations lead to the idea that the complex rearrangements that give rise to the heterogeneous organization of the amplified sequences among the different cell lines precede the amplification of these sequences.
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Nishi, Y., Akiyama, K. & Korf, B.R. Characterization of N-myc amplification in a human neuroblastoma cell line by clones isolated following the phenol emulsion reassociation technique and by hexagonal field gel electrophoresis. Mammalian Genome 2, 11–20 (1991). https://doi.org/10.1007/BF00570436
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DOI: https://doi.org/10.1007/BF00570436