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J Virol, May 1998, p. 4458-4462, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Human T-Cell Leukemia Virus Type 1 pX-I and pX-II Open Reading Frames Are Dispensable for the Immortalization of Primary Lymphocytes

Michael D. Robek, Fen-Hwa Wong,dagger and Lee Ratner*

Departments of Medicine, Pathology, and Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110

Received 16 July 1997/Accepted 11 February 1998

Human T-cell leukemia virus type 1 (HTLV-1) infects and transforms CD4+ T-lymphocytes both in vivo and in vitro. Although the Tax protein of HTLV-1 has been strongly implicated as a transforming agent, other virally encoded proteins may also play a role in the transformation process. In addition to the rex and tax genes, the pX region of the HTLV-1 genome contains two open reading frames (pX-I and pX-II) which encode the putative viral accessory proteins known as p12I, p30II, and p13II. Mutations in the ACH molecular clone of HTLV-1 that are predicted to abrogate the expression of p12I, p13II and p30II were constructed. These mutations had no effect on viral replication or the immortalization of primary lymphocytes. Although these proteins are dispensable for viral replication and immortalization in vitro, it remains possible that they alter infection in vivo.

* Corresponding author. Mailing address: Box 8069, 660 S. Euclid Ave., Washington University, St. Louis, MO 63110. Phone: (314) 362-8836. Fax: (314) 747-2797. E-mail: lratner{at}imgate.wustl.edu.

dagger Present address: Department of Medical Research, Veterans General Hospital, Shin-pai Taipei, Taiwan.

J Virol, May 1998, p. 4458-4462, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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