Abstract
Viruses that establish lifelong latent infections must ensure that the viral genome is maintained within the latently infected cell throughout the life of the host, yet at the same time must also be capable of avoiding elimination by the immune surveillance system. Gammaherpesviruses, which include the human viruses Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus, establish latent infections in lymphocytes. Infection of this dynamic host-cell population requires that the viruses have appropriate strategies for enabling the viral genome to persist while these cells go through rounds of mitosis, but at the same time must avoid detection by host CD8(+) cytotoxic T lymphocytes (CTLs). The majority of gammaherpesviruses studied have been found to encode a specific protein that is critical for maintenance of the viral genome within latently infected cells. This protein is termed the genome maintenance protein (GMP). Due to its vital role in long-term latency, this offers the immune system a crucial target for detection and elimination of virus-infected cells. GMPs from different gammaherpesviruses have evolved related strategies that allow the protein to be present within latently infected cells, but to remain effectively hidden from circulating CD8(+) CTLs. In this review, I will summarize the role of the GMPs and highlight the available data describing the immune-evasion properties of these proteins.
Highlights
Herpesviruses represent a group of double-stranded DNA viruses distributed widely within the animal kingdom
Studies of gammaherpesvirus latent infection have highlighted the importance of a single viral protein: termed the genome maintenance protein (GMP), this protein plays a crucial role in ensuring that the viral genome persists within latently infected cells and that it is partitioned evenly into daughter cells as the cell proceeds through cycles of cell division
This review will summarize the mechanisms by which gammaherpesvirus GMPs function to ensure that the viral genome is maintained within the lymphocyte population, and focus on the unique properties of these proteins that allow the virus to remain hidden from CD8+ cytotoxic T lymphocytes (CTLs) at crucial times during latent infection
Summary
Division of Medical Microbiology, School of Infection and Host Defence, University of Liverpool, Liverpool L69 3GA, UK. Gammaherpesviruses, which include the human viruses Epstein–Barr virus and Kaposi’s sarcoma-associated herpesvirus, establish latent infections in lymphocytes. Infection of this dynamic host-cell population requires that the viruses have appropriate strategies for enabling the viral genome to persist while these cells go through rounds of mitosis, but at the same time must avoid detection by host CD8+ cytotoxic T lymphocytes (CTLs). The majority of gammaherpesviruses studied have been found to encode a specific protein that is critical for maintenance of the viral genome within latently infected cells. This protein is termed the genome maintenance protein (GMP). I will summarize the role of the GMPs and highlight the available data describing the immune-evasion properties of these proteins
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