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. 1988 Feb;62(2):472–478. doi: 10.1128/jvi.62.2.472-478.1988

Mouse mammary tumor proviruses from a T-cell lymphoma are associated with the retroposon L1Md.

J P Dudley 1
PMCID: PMC250557  PMID: 2826809

Abstract

Four Charon 4A clones containing mouse mammary tumor virus (MMTV) proviruses and their cellular flanking sequences were obtained from partial EcoRI libraries of a C57BL/6 T-cell lymphoma with both endogenous and newly acquired MMTV proviruses. The cellular flanking sequences of three of four MMTV proviruses contained DNA homologous to the 3' end of the long interspersed retroposon L1Md. Two of the three proviruses were newly acquired in the lymphoma DNA, and these MMTV proviruses appeared to be 5 kilobases downstream and in the same transcriptional orientation as the L1 sequence. The third provirus was endogenous Mtv-9 and was located less than 500 base pairs from the 3' end of L1. Seven additional clones containing MMTV proviruses were isolated from partial MboI libraries of a B6 T-cell lymphoma. Five of the seven clones contained L1 elements in the cellular DNA flanking MMTV DNA. At least two clones (including one with the Mtv-8 provirus) had multiple L1 copies flanking the MMTV provirus, and one clone contained a single MMTV long terminal repeat directly integrated into a truncated L1 sequence. Although the frequencies of B1 and L1 in random library clones were similar, only one MMTV-containing clone hybridized to the abundant repetitive element B1. These data suggest a nonrandom association between MMTV and L1Md.

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Selected References

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