Mitochondrial genome evolution in the social amoebae

Molecular Biology and Evolution
Andrew J Heidel, Gernot Glöckner

Abstract

Most mitochondria contain a core set of genes required for mitochondrial function, but beyond this base there are variable genomic features. The mitochondrial genome of the model species Dictyostelium discoideum demonstrated that the social amoebae mitochondrial genomes have a size between those of metazoans and plants, but no comparative study of social amoebae mitochondria has been performed. Here, we present a comparative analysis of social amoebae mitochondrial genomes using D. discoideum, Dictyostelium citrinum, Dictyostelium fasciculatum, and Polysphondylium pallidum. The social amoebae mitochondria have similar sizes, AT content, gene content and have a high level of synteny except for one segmental rearrangement and extensive displacement of tRNAs. From the species that contain the rearrangement, it can be concluded that the event occurred late in the evolution of social amoebae. A phylogeny using 36 mitochondrial genes produced a well-supported tree suggesting that the pairs of D. discoideum/D. citrinum and D. fasciculatum/P. pallidum are sister species although the position of the root is not certain. Group I introns and endonucleases are variable in number and location in the social amoebae. Phylogenies of the intron...Continue Reading

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