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-II, located in the nucleus of infected cells. HTLV-I is the causative agent of adult T-cell leukaemia (ATL), a T-lymphocyte malignancy, while HTLV-II has been found associated with a T-cell variant of hairy cell leukaemia. Both viruses immortalize T cells in vitro. 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 cells and the virus contains no classical oncogene sequences. 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 replication. It has also been shown that the LTRs of HTLV and the related bovine leukaemia virus (BLV) are activated in trans in virus-infected cells, 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 transformation. 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.
| Original language | English |
|---|---|
| Pages (from-to) | 571-574 |
| Number of pages | 4 |
| Journal | Nature |
| Volume | 318 |
| Issue number | 6046 |
| DOIs | |
| State | Published - Dec 1 1985 |
| Externally published | Yes |
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Cite this
Identification of the gene responsible for human T-cell leukaemia virus transcriptional regulation. / Cann, A. J.; Rosenblatt, Joseph D; Wachsman, W.; Shah, N. P.; Chen, I. S.
In: Nature, Vol. 318, No. 6046, 01.12.1985, p. 571-574.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Identification of the gene responsible for human T-cell leukaemia virus transcriptional regulation
AU - Cann, A. J.
AU - Rosenblatt, Joseph D
AU - Wachsman, W.
AU - Shah, N. P.
AU - Chen, I. S.
PY - 1985/12/1
Y1 - 1985/12/1
N2 - 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-II, located in the nucleus of infected cells. HTLV-I is the causative agent of adult T-cell leukaemia (ATL), a T-lymphocyte malignancy, while HTLV-II has been found associated with a T-cell variant of hairy cell leukaemia. Both viruses immortalize T cells in vitro. 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 cells and the virus contains no classical oncogene sequences. 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 replication. It has also been shown that the LTRs of HTLV and the related bovine leukaemia virus (BLV) are activated in trans in virus-infected cells, 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 transformation. 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.
AB - 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-II, located in the nucleus of infected cells. HTLV-I is the causative agent of adult T-cell leukaemia (ATL), a T-lymphocyte malignancy, while HTLV-II has been found associated with a T-cell variant of hairy cell leukaemia. Both viruses immortalize T cells in vitro. 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 cells and the virus contains no classical oncogene sequences. 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 replication. It has also been shown that the LTRs of HTLV and the related bovine leukaemia virus (BLV) are activated in trans in virus-infected cells, 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 transformation. 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.
UR - http://www.scopus.com/inward/record.url?scp=0022340975&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0022340975&partnerID=8YFLogxK
U2 - 10.1038/318571a0
DO - 10.1038/318571a0
M3 - Article
C2 - 2999613
AN - SCOPUS:0022340975
VL - 318
SP - 571
EP - 574
JO - Nature
JF - Nature
SN - 0028-0836
IS - 6046
ER -