The Distribution of Group I Introns in Lichen Algae Suggests That Lichenization Facilitates Intron Lateral Transfer
| Autor: | Thomas Friedl, Anja Besendahl, Debashish Bhattacharya, Patrick Pfeiffer |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
0106 biological sciences
Trebouxia Databases Factual Lichens Polymerase Chain Reaction 010603 evolutionary biology 01 natural sciences Evolution Molecular 03 medical and health sciences Phylogenetics Genetics Group I catalytic intron Internal transcribed spacer Molecular Biology Ribosomal DNA Phylogeny Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences Models Genetic biology Trebouxiophyceae Intron biology.organism_classification Introns Thallus Alternative Splicing RNA Ribosomal Nucleic Acid Conformation |
| Zdroj: | Molecular Phylogenetics and Evolution. 14:342-352 |
| ISSN: | 1055-7903 |
| DOI: | 10.1006/mpev.1999.0711 |
| Popis: | The nuclear-encoded small subunit ribosomal DNA gene of many lichen-forming green algae in the genus Trebouxia contains a group I intron at Escherichia coli genic position 1512. We studied the evolutionary history of the 1512 intron in Trebouxia spp. (Trebouxiophyceae) by analyzing intron and "host" cell phylogenies. The host trees were constructed by comparing internal transcribed spacer regions of rDNA. Maximum-likelihood, maximum-parsimony, and distance analyses suggest that the 1512 intron was present in the common ancestor of the green algal classes Trebouxiophyceae, Chlorophyceae, and Ulvophyceae. The 1512 intron, however, was laterally transferred at least three times among later-diverging Trebouxia spp. that form lichen partnerships. Intron secondary structure analyses are consistent with this result. Our results support the hypothesis that lichenization may facilitate 1512 group I intron lateral transfer through the close cell-to-cell contact that occurs between the lichen algal and fungal symbionts in the developing lichen thallus. |
| Databáze: | OpenAIRE |
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