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MBE Advance Access published online on August 29, 2003
Molecular Biology and Evolution, doi:10.1093/molbev/msg201
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2003; all rights reserved
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Accepted June 16, 2003
© 2003 Society for Molecular Biology and Evolution

Original Articles

Phylogeny of Lobose Amoebae Based on Actin and Small-Subunit Ribosomal RNA Genes

José F. Fahrni 1*, Ignacio Bolivar 1, Cédric Berney 1, Elena Nassonova 2, Alexey Smirnov 3, and Jan Pawlowski 1

1 Department of Zoology and Animal Biology, University of Geneva, Geneva, Switzerland
2 Laboratory of Cytology of Unicellular Organisms, Institute of Cytology RAS, St. Petersburg, Russia
3 Department of Invertebrate Zoology, St. Petersburg State University, St. Petersburg, Russia

* To whom correspondence should be addressed. E-mail: jose.fahrni{at}zoo.unige.ch.


  Abstract

Lobose amoebae are abundant free-living protists and important pathogenic agents, yet their evolutionary history and position in the universal tree of life are poorly known. Molecular data for lobose amoebae are limited to a few species, and all phylogenetic studies published so far lacked representatives of many of their taxonomic groups. Here we analyse actin and small-subunit ribosomal RNA (SSU rRNA) gene sequences of a broad taxon sampling of naked, lobose amoebae. Our results support the existence of a monophyletic Amoebozoa clade, which comprises all lobose amoebae examined so far, as well as the amitochondriate pelobionts and entamoebids, and the slime molds. Both actin and SSU rRNA phylogenies distinguish two well defined clades of amoebae, the "Gymnamoebia sensu stricto" and the Archamoebae (pelobionts + entamoebids), and one weakly supported and ill-resolved group comprising some naked, lobose amoebae and the Mycetozoa.

Key Words: actin, Amoebozoa, Lobosea, molecular phylogeny, small-subunit ribosomal RNA


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