Untangling the early diversification of eukaryotes: a phylogenomic study of the evolutionary origins of Centrohelida, Haptophyta and Cryptista
| Autor: | Fabien Burki, Vasily V. Zlatogursky, Maia Kaplan, Patrick J. Keeling, Liudmila V. Radaykina, Bui Quang Minh, Denis V. Tikhonenkov, Alexander P. Mylnikov, Alexey V. Smirnov |
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| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
0301 basic medicine Tree of life Genomics Context (language use) computer.software_genre 010603 evolutionary biology 01 natural sciences General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Phylogenetics Phylogenomics Phylogeny Research Articles General Environmental Science General Immunology and Microbiology biology Archaeplastida Eukaryota Genetic Variation General Medicine biology.organism_classification Biological Evolution Centrohelid Tree (data structure) 030104 developmental biology Evolutionary biology Data mining General Agricultural and Biological Sciences computer |
| Zdroj: | Proceedings. Biological sciences. 283(1823) |
| ISSN: | 1471-2954 |
| Popis: | Assembling the global eukaryotic tree of life has long been a major effort of Biology. In recent years, pushed by the new availability of genome-scale data for microbial eukaryotes, it has become possible to revisit many evolutionary enigmas. However, some of the most ancient nodes, which are essential for inferring a stable tree, have remained highly controversial. Among other reasons, the lack of adequate genomic datasets for key taxa has prevented the robust reconstruction of early diversification events. In this context, the centrohelid heliozoans are particularly relevant for reconstructing the tree of eukaryotes because they represent one of the last substantial groups that was missing large and diverse genomic data. Here, we filled this gap by sequencing high-quality transcriptomes for four centrohelid lineages, each corresponding to a different family. Combining these new data with a broad eukaryotic sampling, we produced a gene-rich taxon-rich phylogenomic dataset that enabled us to refine the structure of the tree. Specifically, we show that (i) centrohelids relate to haptophytes, confirming Haptista; (ii) Haptista relates to SAR; (iii) Cryptista share strong affinity with Archaeplastida; and (iv) Haptista + SAR is sister to Cryptista + Archaeplastida. The implications of this topology are discussed in the broader context of plastid evolution. |
| Databáze: | OpenAIRE |
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