Molecular Biology and Evolution, Vol 16, 577-589, Copyright © 1999 by Society for Molecular Biology and Evolution
D Huchon, FM Catzeflis and EJ Douzery
Nucleotide sequences of exon 28 of the von Willebrand Factor (vWF) were
analyzed for a representative sampling of rodent families and eutherian
orders, with one marsupial sequence as outgroup. The aim of this study was
to test if inclusion of an increased taxonomic diversity in molecular
analyses would shed light on three uncertainties concerning rodent
phylogeny: (1) relationships between rodent families, (2) Rodentia
monophyly, and (3) the sister group relationship of rodents and lagomorphs.
The results did not give evidence of any particular rodent pattern of
molecular evolution relative to a general eutherian pattern. Base
compositions and rates of evolution of vWF sequences of rodents were in the
range of placental variation. The 10 rodent families studied here cluster
in five clades: Hystricognathi, Sciuridae and Aplodontidae (Sciuroidea),
Muridae, Dipodidae, and Gliridae. Among hystricognaths, the following
conclusions are drawn: a single colonization event in South America by
Caviomorpha, a paraphyly of Old World and New World porcupines, and an
African origin for Old World porcupines. Despite a broader taxonomic
sampling diversity, we did not obtain a robust answer to the question of
Rodentia monophyly, but in the absence of any other alternative, we cannot
reject the hypothesis of a single origin of rodents. Moreover, the
phylogenetic position of Lagomorpha remains totally unsettled.
ORIGINAL ARTICLE
Molecular evolution of the nuclear von Willebrand factor gene in mammals and the phylogeny of rodents
Laboratoire de Paleontologie, Paleobiologie et Phylogenie, Universite Montpellier II, France. huchon@isem.univ-montp2.fr
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