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Divergent Histories of rDNA Group I Introns in the Lichen Family Physciaceae

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Abstract

The wide but sporadic distribution of group I introns in protists, plants, and fungi, as well as in eubacteria, likely resulted from extensive lateral transfer followed by differential loss. The extent of horizontal transfer of group I introns can potentially be determined by examining closely related species or genera. We used a phylogenetic approach with a large data set (including 62 novel large subunit [LSU] rRNA group I introns) to study intron movement within the monophyletic lichen family Physciaceae. Our results show five cases of horizontal transfer into homologous sites between species but do not support transposition into ectopic sites. This is in contrast to previous work with Physciaceae small subunit (SSU) rDNA group I introns where strong support was found for multiple ectopic transpositions. This difference in the apparent number of ectopic intron movements between SSU and LSU rDNA genes may in part be explained by a larger number of positions in the SSU rRNA, which can support the insertion and/or retention of group I introns. In contrast, we suggest that the LSU rRNA may have fewer acceptable positions and therefore intron spread is limited in this gene.

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Acknowledgments

This work was supported by a grant awarded to D.B. from the National Science Foundation (MCB 01-10252) and a grant from the Deutsche Forschungsgemeinschaft to T.F. (Fr 905/7-1,2). D.S. was partially supported by a Stanley Fellowship and an Avis E. Cone research fellowship from the University of Iowa and J.M. was supported by a NSF-REU grant (MCB-03-26864) awarded to D.B. We also thank Peik Haugen (Iowa) for helpful discussions.

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  1. Department of Biological Sciences and the Roy J. Carver Center for Comparative Genomics, University of Iowa, 312 Biology Building, Iowa City, IA, 52242-1324, USA

    Dawn Simon, Jessica Moline & Debashish Bhattacharya

  2. Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Abteilung Experimentelle Phykologie und Sammlung von Algenkulturen, Universität Göttingen, 37073, Göttingen, Germany

    Gert Helms & Thomas Friedl

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  1. Dawn Simon
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Correspondence to Debashish Bhattacharya.

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Simon, D., Moline, J., Helms, G. et al. Divergent Histories of rDNA Group I Introns in the Lichen Family Physciaceae. J Mol Evol 60, 434–446 (2005). https://doi.org/10.1007/s00239-004-0152-2

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