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Journal of Virology, April 2005, p. 4977-4990, Vol. 79, No. 8
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.8.4977-4990.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Evidence of Recombination in the Norovirus Capsid Gene

Jacques Rohayem,1* Julia Münch,1 and Axel Rethwilm2

Institut für Virologie, The Calicilab, Medizinische Fakultät Carl Gustav Carus, Dresden,1 Institut für Virologie und Immunbiologie, Universität Würzburg, Würzburg, Germany2

Received 7 June 2004/ Accepted 12 December 2004

Noroviruses are single-stranded RNA viruses with high genomic variability. They have emerged in the last decade as a major cause of acute gastroenteritis. It remains so far unclear whether norovirus evolution is driven by sequence mutation and/or recombination. In this study, we have assessed the occurrence of recombination in the norovirus capsid gene. For this purpose, 69 complete capsid sequences of norovirus strains accessible in GenBank as well as 25 complete capsid sequences generated from norovirus-positive clinical samples were examined. Unreported recombination was detected in about 8% of norovirus strains belonging to genetic clusters I/1 (n = 1), II/1 (n = 1), II/3 (n = 1), II/4 (n = 3), and II/5 (n = 1). Recombination breakpoints were mainly located at the interface of the putative P1-1 and P2 domains of the capsid protein and/or within the P2 domain. The recombination region displayed features such as length, sequence composition (upstream and downstream GC- and AU-rich sequences, respectively), and predicted RNA secondary structure that are characteristic of homologous recombination activators. Our results suggest that recombination in the norovirus capsid gene may naturally occur, involving capsid domains presumably exposed to immunological pressure.

* Corresponding author. Mailing address: Institut für Virologie, The Calicilab, Fetscherstr. 74, D-01307 Dresden, Germany. Phone: 49-351-458 6200. Fax: 49-351-458 6314. E-mail: Jacques.Rohayem{at}mailbox.tu-dresden.de.

Journal of Virology, April 2005, p. 4977-4990, Vol. 79, No. 8
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.8.4977-4990.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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