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Microbiology and Molecular Biology Reviews, September 2004, p. 432-452, Vol. 68, No. 3
1092-2172/04/$08.00+0     DOI: 10.1128/MMBR.68.3.432-452.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Effects of Length and Location on the Cellular Response to Double-Stranded RNA

Qiaoqiao Wang and Gordon G. Carmichael*

Department of Genetics and Developmental Biology, University of Connecticut Health Center, Farmington, Connecticut

Since double-stranded RNA (dsRNA) has not until recently generally been thought to be deliberately expressed in cells, it has commonly been assumed that the major source of cellular dsRNA is viral infections. In this view, the cellular responses to dsRNA would be natural and perhaps ancient antiviral responses. While the cell may certainly react to some dsRNAs as an antiviral response, this does not represent the only response or even, perhaps, the major one. A number of recent observations have pointed to the possibility that dsRNA molecules are not seen only as evidence of viral infection or recognized for degradation because they cannot be translated. In some instances they may also play important roles in normal cell growth and function. The purpose of this review is to outline our current understanding of the fate of dsRNA in cells, with a focus on the apparent fact that their fates and functions appear to depend critically not only on where in the cell dsRNA molecules are found, but also on how long they are and perhaps on how abundant they are.

* Corresponding author. Mailing address: Department of Genetics and Developmental Biology, University of Connecticut Health Center, Farmington, CT 06030-3301. Phone: (860) 679-2259. Fax: (860) 679-8345. carmichael{at}nso2.uchc.edu.

Microbiology and Molecular Biology Reviews, September 2004, p. 432-452, Vol. 68, No. 3
1092-2172/04/$08.00+0     DOI: 10.1128/MMBR.68.3.432-452.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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