Journal of Virology, February 2000, p. 1578-1586, Vol. 74, No. 3
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Department of Human Retrovirology, Academic Medical Center, University of Amsterdam,1 and Amsterdam Institute of Viral Genomics,2 Amsterdam, The Netherlands
Received 14 July 1999/Accepted 27 October 1999
To study the evolutionary history of Papio cynocephalus
endogenous retrovirus (PcEV), we analyzed the distribution and
genetic characteristics of PcEV among 17 different species of primates. The viral pol-env and long terminal repeat and untranslated
region (LTR-UTR) sequences could be recovered from all Old World
species of the papionin tribe, which includes baboons, macaques,
geladas, and mangabeys, but not from the New World monkeys and
hominoids we tested. The Old World genera Cercopithecus and
Miopithecus hosted either a PcEV variant with an incomplete
genome or a virus with substantial mismatches in the LTR-UTR. A
complete PcEV was found in the genome of Colobus
guereza
but not in Colobus badius
with a copy
number of 44 to 61 per diploid genome, comparable to that seen in
papionins, and with a sequence most closely related to a virus of the
papionin tribe. Analysis of evolutionary distances among PcEV sequences
for synonymous and nonsynonymous sites indicated that purifying
selection was operational during PcEV evolution. Phylogenetic analysis
suggested that possibly two subtypes of PcEV entered the germ line of a
common ancestor of the papionins and subsequently coevolved with their
hosts. One strain of PcEV was apparently transmitted from a papionin
ancestor to an ancestor of the central African lowland C. guereza.
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