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Journal of Virology, February 2005, p. 1595-1604, Vol. 79, No. 3
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.3.1595-1604.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Complete Genomic Sequence of Human Coronavirus OC43: Molecular Clock Analysis Suggests a Relatively Recent Zoonotic Coronavirus Transmission Event
Leen Vijgen,
Els Keyaerts,
Elien Moës,
Inge Thoelen,
Elke Wollants,
Philippe Lemey,
Anne-Mieke Vandamme, and
Marc Van Ranst*
Laboratory of Clinical and Epidemiological Virology, Department of Microbiology and Immunology, Rega Institute for Medical Research, University of Leuven, Leuven, Belgium
Received 14 June 2004/
Accepted 16 September 2004
Coronaviruses are enveloped, positive-stranded RNA viruses with a genome of approximately 30 kb. Based on genetic similarities, coronaviruses are classified into three groups. Two group 2 coronaviruses, human coronavirus OC43 (HCoV-OC43) and bovine coronavirus (BCoV), show remarkable antigenic and genetic similarities. In this study, we report the first complete genome sequence (30,738 nucleotides) of the prototype HCoV-OC43 strain (ATCC VR759). Complete genome and open reading frame (ORF) analyses were performed in comparison to the BCoV genome. In the region between the spike and membrane protein genes, a 290-nucleotide deletion is present, corresponding to the absence of BCoV ORFs ns4.9 and ns4.8. Nucleotide and amino acid similarity percentages were determined for the major HCoV-OC43 ORFs and for those of other group 2 coronaviruses. The highest degree of similarity is demonstrated between HCoV-OC43 and BCoV in all ORFs with the exception of the E gene. Molecular clock analysis of the spike gene sequences of BCoV and HCoV-OC43 suggests a relatively recent zoonotic transmission event and dates their most recent common ancestor to around 1890. An evolutionary rate in the order of 4 x 104 nucleotide changes per site per year was estimated. This is the first animal-human zoonotic pair of coronaviruses that can be analyzed in order to gain insights into the processes of adaptation of a nonhuman coronavirus to a human host, which is important for understanding the interspecies transmission events that led to the origin of the severe acute respiratory syndrome outbreak.
* Corresponding author. Mailing address: Laboratory of Clinical and Epidemiological Virology, Department of Microbiology and Immunology, Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, BE-3000 Leuven, Belgium. Phone: 32-16-347908. Fax: 32-16-347900. E-mail:
marc.vanranst{at}uz.kuleuven.ac.be.
Journal of Virology, February 2005, p. 1595-1604, Vol. 79, No. 3
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.3.1595-1604.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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