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Journal of Virology, November 2001, p. 10118-10131, Vol. 75, No. 21
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.21.10118-10131.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Evolutionary Relationships and Systematics of
the Alphaviruses
Ann M.
Powers,1,2,
Aaron C.
Brault,1,
Yukio
Shirako,3,
Ellen G.
Strauss,3
WenLi
Kang,1
James H.
Strauss,3 and
Scott C.
Weaver1,*
Department of Pathology and Center for
Tropical Diseases, University of Texas Medical Branch, Galveston,
Texas 77555-06091; Division of Vector-Borne
Infectious Diseases, Centers for Disease Control and Prevention,
Fort Collins, Colorado2; and Division of
Biology, California Institute of Technology, Pasadena, California
911253
Received 1 May 2001/Accepted 8 August 2001
Partial E1 envelope glycoprotein gene sequences and complete
structural polyprotein sequences were used to compare divergence and
construct phylogenetic trees for the genus Alphavirus. Tree topologies indicated that the mosquito-borne alphaviruses could have
arisen in either the Old or the New World, with at least two
transoceanic introductions to account for their current distribution. The time frame for alphavirus diversification could not be estimated because maximum-likelihood analyses indicated that the nucleotide substitution rate varies considerably across sites within the genome.
While most trees showed evolutionary relationships consistent with
current antigenic complexes and species, several changes to the current
classification are proposed. The recently identified fish alphaviruses
salmon pancreas disease virus and sleeping disease virus appear to be
variants or subtypes of a new alphavirus species. Southern elephant
seal virus is also a new alphavirus distantly related to all of the
others analyzed. Tonate virus and Venezuelan equine encephalitis virus
strain 78V3531 also appear to be distinct alphavirus species based on
genetic, antigenic, and ecological criteria. Trocara virus, isolated
from mosquitoes in Brazil and Peru, also represents a new species and
probably a new alphavirus complex.
*
Corresponding author. Mailing address: Department of
Pathology, University of Texas Medical Branch, Galveston, TX
77555-0609. Phone: (409) 747-0758. Fax: (409) 747-2415. E-mail:
sweaver{at}utmb.edu.

Present address: Division of Vector-Borne Infectious Diseases,
Centers for Disease Control and Prevention, Fort Collins, CO
80522.

Present address: Asian Center for Bioresources and Environmental
Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657,
Japan.
Journal of Virology, November 2001, p. 10118-10131, Vol. 75, No. 21
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.21.10118-10131.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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