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Activation of cellular gene by mouse mammary tumour virus may occur early in mammary tumour development

Nature volume 309, pages 273–275 (1984)Cite this article

Abstract

There is now good evidence that the induction of mammary carcinomas by mouse mammary tumour virus (MMTV) involves provirus activation of specific cellular genes. Thus, a high percentage of virally induced tumours contain an acquired MMTV provirus in either of two defined integration regions, termed int-1 and int-2, and provirus insertion is accompanied by expression of specific RNA transcripts from these regions1–4. We show here that in some recurring, pregnancy-dependent mammary tumours provirus integration within int-2 has already occurred at the earliest appearance of the tumour and may therefore represent an important step in the development of neoplasia. As judged by the distribution of the acquired MMTV proviruses, the tumours recurring at any one site represent the same clonal population of cells as the original tumour and remain clonal during cycles of proliferation and regression, including the transition to hormone-independent status. These data suggest that either the expression of the int-2 locus or the function of this putative oncogene must remain responsive to hormones and that some additional event must be responsible for the transition to autonomous growth.

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Authors and Affiliations

  1. Imperial Cancer Research Fund Laboratories, PO Box 123, Lincoln's Inn Fields, London, WC2A 3PX, UK

    Gordon Peters, Audrey E. Lee & Clive Dickson

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  1. Gordon Peters
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  2. Audrey E. Lee
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  3. Clive Dickson
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Peters, G., Lee, A. & Dickson, C. Activation of cellular gene by mouse mammary tumour virus may occur early in mammary tumour development. Nature 309, 273–275 (1984). https://doi.org/10.1038/309273a0

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