A Fully Resolved Phylogeny of the Social Amoebas (Dictyostelia) Based on Combined SSU and ITS rDNA Sequences
2010 (English)In: Protist, ISSN 1434-4610, E-ISSN 1618-0941, Vol. 161, no 4, 539-548 p.Article in journal (Refereed) Published
The dictyostelids possess a complex life cycle including aggregative and multicellular stages. They also include one of the most widely studied protistan model organisms, Dictyostelium discoideum. The current molecular phylogeny of dictyostelids is based largely on SSU (18S) rDNA sequences and shows a deep taxon consisting of four major groups, none of which correspond to the three traditional morphologically-defined genera. However, due to the generally slowly evolving nature of SSU rDNA, these data fail to resolve the majority of branches within the four groups. Given the highly morphologically mixed nature of the dictyostelid groups, it is important to resolve relationships within them. We have determined sequences for the internal transcribed spacers (ITS) of rDNA for nearly all species in the original dictyostelid global phylogeny. Phylogenetic analyses of these data, in combination with the previously determined SSUr DNA sequences, confidently resolve nearly all branches in the tree. This now fully resolved phylogeny confirms the utility of ITS for dictyostelid systematics and lays the ground work for further evolutionary study of the group. (c) 2010 Elsevier GmbH. All rights reserved.
Place, publisher, year, edition, pages
2010. Vol. 161, no 4, 539-548 p.
Amoebozoa, development, Dictyostelium, evolution, 18S rDNA
Research subject Biology with specialization in Systematics
IdentifiersURN: urn:nbn:se:uu:diva-134957DOI: 10.1016/j.protis.2009.12.006ISI: 000280895200005OAI: oai:DiVA.org:uu-134957DiVA: diva2:375156
FunderEU, FP7, Seventh Framework Programme, 236501