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2015 ; 32
(5
): 1354-64
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A new method for estimating species age supports the coexistence of malaria
parasites and their Mammalian hosts
#MMPMID25589738
Silva JC
; Egan A
; Arze C
; Spouge JL
; Harris DG
Mol Biol Evol
2015[May]; 32
(5
): 1354-64
PMID25589738
show ga
Species in the genus Plasmodium cause malaria in humans and infect a variety of
mammals and other vertebrates. Currently, estimated ages for several mammalian
Plasmodium parasites differ by as much as one order of magnitude, an inaccuracy
that frustrates reliable estimation of evolutionary rates of disease-related
traits. We developed a novel statistical approach to dating the relative age of
evolutionary lineages, based on Total Least Squares regression. We validated this
lineage dating approach by applying it to the genus Drosophila. Using data from
the Drosophila 12 Genomes project, our approach accurately reconstructs the age
of well-established Drosophila clades, including the speciation event that led to
the subgenera Drosophila and Sophophora, and age of the melanogaster species
subgroup. We applied this approach to hundreds of loci from seven mammalian
Plasmodium species. We demonstrate the existence of a molecular clock specific to
individual Plasmodium proteins, and estimate the relative age of
mammalian-infecting Plasmodium. These analyses indicate that: 1) the split
between the human parasite Plasmodium vivax and P. knowlesi, from Old World
monkeys, occurred 6.1 times earlier than that between P. falciparum and P.
reichenowi, parasites of humans and chimpanzees, respectively; and 2) mammalian
Plasmodium parasites originated 22 times earlier than the split between P.
falciparum and P. reichenowi. Calibrating the absolute divergence times for
Plasmodium with eukaryotic substitution rates, we show that the split between P.
falciparum and P. reichenowi occurred 3.0-5.5 Ma, and that mammalian Plasmodium
parasites originated over 64 Ma. Our results indicate that mammalian-infecting
Plasmodium evolved contemporaneously with their hosts, with little evidence for
parasite host-switching on an evolutionary scale, and provide a solid timeframe
within which to place the evolution of new Plasmodium species.