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Root of Dictyostelia based on 213 universal proteins
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Systematic Biology.
Freie Univ, Berlin, Germany..
Univ Tsukuba, Tsukuba, Ibaraki 305, Japan..
Univ Dundee, Dundee DD1 4HN, Scotland..
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2015 (English)In: Molecular Phylogenetics and Evolution, ISSN 1055-7903, E-ISSN 1095-9513, Vol. 92, 53-62 p.Article in journal (Refereed) Published
Abstract [en]

Dictyostelia are common soil microbes that can aggregate when starved to form multicellular fruiting bodies, a characteristic that has also led to their long history of study and widespread use as model systems. Ribosomal RNA phylogeny of Dictyostelia identified four major divisions (Groups 1-4), none of which correspond to traditional genera. Group 1 was also tentatively identified as sister lineage to the other three Groups, although not consistently or with strong support. We tested the dictyostelid root using universal protein-coding genes identified by exhaustive comparison of six completely sequenced dictyostelid genomes, which include representatives of all four major molecular Groups. A set of 213 genes are low-copy number in all genomes, present in at least one amoebozoan outgroup taxon (Acanthamoeba castellanii or Physarum polycephalum), and phylogenetically congruent Phylogenetic analysis of a concatenation of the deduced protein sequences produces a single topology dividing Dictyostelia into two major divisions: Groups 1 + 2 and Groups 3 + 4. All clades in the tree are fully supported by maximum likelihood and Bayesian inference, and all alternative roots are unambiguously rejected by the approximately unbiased (AU) test. The 1 + 2, 3 + 4 root is also fully supported even after deleting clusters with strong individual support for this root, or concatenating all clusters with low support for alternative roots. The 213 putatively ancestral amoebozoan proteins encode a wide variety of functions including 21 KOG categories out of a total of 25. These comprehensive analyses and consistent results indicate that it is time for full taxonomic revision of Dictyostelia, which will also enable more effective exploitation of its unique potential as an evolutionary model system.

Place, publisher, year, edition, pages
2015. Vol. 92, 53-62 p.
Keyword [en]
Aggregative multi-cellularity, Universal genes, Multigene phylogeny, Evolution of complexity
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-265803DOI: 10.1016/j.ympev.2015.05.017ISI: 000362381700005PubMedID: 26048704OAI: oai:DiVA.org:uu-265803DiVA: diva2:866711
Funder
Swedish Research Council, D0437801
Available from: 2015-11-03 Created: 2015-11-03 Last updated: 2017-12-01Bibliographically approved

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Sheikh, SaneaBaldauf, Sandra L.

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