Abstract
The majority of human T-cell leukemia virus isolates (HTLV-I) are associated with clinically aggressive adult T-cell leukemia/lymphomas. By contrast, HTLV-II has been isolated from a patient with a relatively benign hairy T-cell leukemia. To characterize differences in the viral genomes that might contribute to these different pathologies, we determined the nucleotide sequence of the long terminal repeat (LTR) of a HTLV-II provirus. Comparison with the type I HTLV LTR reveals that, whereas the overall structural features are similar, the two sequences differ markedly throughout most of the length of the LTR. Despite the overall differences, the sequences of several functional regions of the two LTRs are conserved. These include the 5' boundary of U3, the RNA cap site, and the tRNAPro-binding site immediately 3' to the LTR. Another point of similarity is a 21-base sequence that is repeated four times in the U3 region of HTLV-II and three times in the U3 region of HTLV-I. This sequence has a formal analogy to, but no common sequence with, viral transcriptional enhancers. The U3 region of HTLV-II possesses a series of imperfect tandem direct repeats, 42 bases long, 21 bases long, 19 bases long, and 7 bases long. These structures differ from those of HTLV-I except for the 21-base repeat sequence. Thus, the structure of HTLV-II differs substantially from that of HTLV-I in the region that governs transcriptional initiation and tissue specificity. Such differences may account for some of the differences in clinical presentation of HTLV-associated adult T-cell leukemia/lymphomas and hairy T-cell leukemia.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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