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Medical Microbiology and Immunology
Published in: Medical Microbiology and Immunology 3/2015

Open Access 01-06-2015 | Review

Sleepless latency of human cytomegalovirus

Authors: Emma Poole, John Sinclair

Published in: Medical Microbiology and Immunology | Issue 3/2015

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Abstract

As with all human herpesviruses, human cytomegalovirus (HCMV) persists for the lifetime of the host by establishing a latent infection, which is broken by periodic reactivation events. One site of HCMV latency is in the progenitor cells of the myeloid lineage such as CD34+ cells and their CD14+ derivatives. The development of experimental techniques to isolate and culture these primary cells in vitro is enabling detailed analysis of the events that occur during virus latency and reactivation. Ex vivo differentiation of latently infected primary myeloid cells to dendritic cells and macrophages results in the reactivation of latent virus and provides model systems in which to analyse the viral and cellular functions involved in latent carriage and reactivation. Such analyses have shown that, in contrast to primary lytic infection or reactivation which is characterised by a regulated cascade of expression of all viral genes, latent infection is associated with a much more restricted viral transcription programme with expression of only a small number of viral genes. Additionally, concomitant changes in the expression of cellular miRNAs and cellular proteins occur, and this includes changes in the expression of a number of secreted cellular proteins and intracellular anti-apoptotic proteins, which all have profound effects on the latently infected cells. In this review, we concentrate on the effects of one of the latency-associated viral proteins, LAcmvIL-10, and describe how it causes a decrease in the cellular miRNA, hsa-miR-92a, and a concomitant upregulation of the GATA2 myeloid transcription factor, which, in turn, drives the expression of cellular IL-10. Taken together, we argue that HCMV latency, rather than a period of viral quiescence, is associated with the virally driven manipulation of host cell functions, perhaps every bit as complex as lytic infection. A full understanding of these changes in cellular and viral gene expression during latent infection could have far-reaching implications for therapeutic intervention.
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Metadata
Title
Sleepless latency of human cytomegalovirus
Authors
Emma Poole
John Sinclair
Publication date
01-06-2015
Publisher
Springer Berlin Heidelberg
Published in
Medical Microbiology and Immunology / Issue 3/2015
Print ISSN: 0300-8584
Electronic ISSN: 1432-1831
DOI
https://doi.org/10.1007/s00430-015-0401-6

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