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Journal of Virology, May 2007, p. 5418-5422, Vol. 81, No. 10
0022-538X/07/$08.00+0     doi:10.1128/JVI.02763-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

In Vivo Fitness Costs of Different Gag CD8 T-Cell Escape Mutant Simian-Human Immunodeficiency Viruses for Macaques{triangledown}

Liyen Loh,1 C. Jane Batten,1 Janka Petravic,2 Miles P. Davenport,2 and Stephen J. Kent1*

Department of Microbiology and Immunology, University of Melbourne, Victoria 3010, Australia,1 Department of Haematology, Prince of Wales Hospital, and Centre for Vascular Research, University of New South Wales, NSW 2052, Australia2

Received 14 December 2006/ Accepted 20 February 2007

The kinetics of immune escape and reversion depend upon the efficiency of CD8 cytotoxic T lymphocytes (CTL) and the fitness cost of escape mutations. Escape kinetics of three simian immunodeficiency virus Gag CTL epitopes in pigtail macaques were variable; those of KP9 and AF9 were faster than those of KW9. Kinetics of reversion of escape mutant virus to wild type upon passage to naïve major histocompatibility complex-mismatched macaques also varied. Rapid reversion occurred at KP9, gradual biphasic reversion occurred at AF9, and escape mutant KW9 virus failed to revert. The fitness impact of these mutations is KP9 > AF9 > KW9. These data provide insights into the differential utility of CTL in controlling viremia.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, University of Melbourne, Parkville 3010, Australia. Phone: 61 3 83449939. Fax: 61 3 83443846. E-mail: skent{at}unimelb.edu.au

{triangledown} Published ahead of print on 7 March 2007.

Journal of Virology, May 2007, p. 5418-5422, Vol. 81, No. 10
0022-538X/07/$08.00+0     doi:10.1128/JVI.02763-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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