alexa Noncoding RNAs produced by oncogenic human herpesviruses.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Pharmacogenomics & Pharmacoproteomics

Author(s): Swaminathan S

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Abstract The two human herpesviruses that are causally associated with cancer are Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus (KSHV). Both are lymphocryptoviruses that establish latency in B lymphocytes and persist for the lifetime of the host. EBV and KSHV are both linked to a variety of lymphomas. EBV is also a causative agent or cofactor in epithelial malignancies such as nasopharyngeal carcinoma whereas Kaposi's sarcoma is of endothelial cell origin. Both viruses encode a limited number of proteins during latent replication that are important for growth transformation and evasion of the immune system. In addition, they express noncoding RNAs during both latent and lytic infection. Many of these RNAs have been highly conserved during evolution and are expressed in a wide variety of clinical settings, suggesting their fundamental importance in the viral life cycle. The function of some of these RNAs such as the nuclear EBV EBER RNAs remains elusive although they are some of the most abundant transcripts produced by each virus. Both EBV and KSHV also have recently been shown to encode and express microRNAs. The study of these viral microRNAs is just beginning although several of their cellular and viral gene targets have been established. Viral microRNAs appear to be involved in both modulation of the immune response as well as oncogenesis. Because each target gene may have many microRNAs acting on its mRNA, and each microRNA may have more than one target, there are likely to be many new discoveries regarding the complex interactions of viral microRNAs and host cell genes. (c) 2008 Wiley-Liss, Inc. This article was published in J Cell Physiol and referenced in Journal of Pharmacogenomics & Pharmacoproteomics

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