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Identification of the gene responsible for human T-cell leukaemia virus transcriptional regulation

Abstract

Human T-cell leukaemia viruses (HTLVs) have genomic organization distinct from that of other replication-competent retroviruses, possessing four genes, gag, pol, env and χ. The unique fourth gene, χ (also referred to as lor), is located between env and the 3′ long terminal repeat (LTR), encoding a protein of relative molecular mass 40,000 for HTLV-I and 37,000 for HTLV-II1,2, located in the nucleus of infected cells3,4. HTLV-I is the causative agent of adult T-cell leukaemia (ATL), a T-lymphocyte malignancy5,6, while HTLV-II has been found associated with a T-cell variant of hairy cell leukaemia7,8. Both viruses immortalize T cells in vitro9–11. However, the mechanism of cellular transformation induced by HTLV is not known as there seems to be no common site of provirus integration in primary ATL cells12 and the viras contains no classical oncogene sequences13,14. These observations have provoked speculation that the unique and strongly conserved χ protein (85% amino-acid homology between HTLV-I and -II) is involved in HTLV leukaemogenesis. Recent mutagenesis experiments in our laboratory have shown that the χ gene is essential for HTLV replication15. It has also been shown that the LTRs of HTLV and the related bovine leukaemia virus (BLV) are activated in trans in virus-infected cells16–19, and, although such experiments did not directly demonstrate a role for the χ protein in transcriptional activation, it has been suggested that the χ protein is responsible for the transcriptional activation of the LTR and may be involved in cellular transformation3,4,16. We have now developed a transient co-transfection assay which demonstrates that transcriptional activation of the HTLV LTR is mediated solely by the χ protein and that no other virus genes are required.

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Cann, A., Rosenblatt, J., Wachsman, W. et al. Identification of the gene responsible for human T-cell leukaemia virus transcriptional regulation. Nature 318, 571–574 (1985). https://doi.org/10.1038/318571a0

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