Kaposi Sarcoma Herpesvirus: New Perspectives

Volume 312 of the series Current Topics in Microbiology and Immunology pp 157-183

Regulation of KSHV Lytic Gene Expression

  • H. DengAffiliated withCenter for Infection and Immunity, National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of SciencesSchool of Dentistry, University of California at Los Angeles
  • , Y. LiangAffiliated withDepartment of Pathology and Laboratory Medicine, Emory University
  • , R. SunAffiliated withDepartment of Molecular and Medical Pharmacology, University of California at Los Angeles

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The life cycle of KSHV, latency versus lytic replication, is mainly determined at the transcriptional regulation level. A viral immediate-early gene product, replication and transcription activator (RTA), has been identified as the molecular switch for initiation of the lytic gene expression program from latency. Here we review progress on two key questions: how RTA gene expression is controlled by viral proteins and cellular signals and how RTA regulates the expression of downstream viral genes. We summarize the interactions of RTA with cellular and other viral proteins. We also discuss critical issues that must be addressed in the near future.