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- W2061649968 abstract "Four independent clones of RSV-transformed Chinese hamster fibroblasts were isolated. Southern blots and dot hybridization studies showed that in three out of four clones there were four to eight times as many integrated proviruses as in the fourth clone which contained at least one complete provirus. Restriction mapping studies showed that although the integration site varied from clone to clone, all the proviral copies in the same clone shared the same flanking cellular sequences. In one clone there are at least two polymorphic proviral variants A and B, one with and one without a BglI site. Further experiments were performed to see if the variants could be physically separated. RSV-Transformed Chinese hamster cells resistant to thioguanine were fused with mouse cells to give somatic hybrids which preferentially segregate Chinese hamster chromosomes. Ten out of eleven hybrids positive for virus rescue have lost up to 90% of the parental provirus copies. Four of these hybrids were found to contain the provirus variant A alone, one the variant B alone, and the rest contained both variants. All the proviruses retained in somatic hybrids shared the flanking cellular sequences of the parental provirus. Provirus segregation in somatic hybrids confirms that multiple (about ten) copies of the provirus region are present in the karyotype of parental RSV-transformed cells and, furthermore, suggests that the amplified copies of this region are translocated to different chromosomes." @default.
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- W2061649968 date "1983-07-01" @default.
- W2061649968 modified "2023-09-25" @default.
- W2061649968 title "Amplification of the provirus region in Rous sarcoma virus-transformed Chinese hamster cells and segregation of the amplified copies in somatic cell hybrids" @default.
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- W2061649968 doi "https://doi.org/10.1016/0042-6822(83)90314-8" @default.
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