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J Virol. 1988 April; 62(4): 1203-1210

Expression of human sequences related to those of mouse mammary tumor virus.

University Department of Pathology, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom.

ABSTRACT

Sequences related to those of the mouse mammary tumor virus (MuMTV) genome have been cloned from human DNA by screening a library prepared from the DNA of a human breast cancer cell line with MuMTV gag-pol DNA. Nine distinct groups of (MuMTV-related) sequences were identified among 100 lambda recombinants by cross-hybridization experiments with subcloned fragments containing gag-pol-related DNA. The largest group, of 64 recombinants, contains the MuMTV-related sequences cloned by others. The other eight groups contain MuMTV-related sequences that have not been described previously. The gag-pol regions of one recombinant from each of the nine groups were hybridized to RNA prepared from five human breast cancer cell lines, from placenta, and from two cell lines derived from other malignancies. RNAs were detected by probes for seven of the groups. The RNAs ranged in size from 1.2 to 12 kilobases. Probes for six of the groups detected large RNAs that could represent transcripts of full-length proviral DNA. Two of the probes detected RNA in one breast cancer cell line only. Most of the RNAs were detected in more than one cell line.

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