ORCID Profile
0000-0002-8248-8462
Current Organisations
Uppsala University
,
Uppsala Universitet
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Publisher: Elsevier BV
Date: 2020
DOI: 10.1016/J.TREE.2019.08.008
Abstract: For 15 years, the eukaryote Tree of Life (eToL) has been ided into five to eight major groupings, known as 'supergroups'. However, the tree has been profoundly rearranged during this time. The new eToL results from the widespread application of phylogenomics and numerous discoveries of major lineages of eukaryotes, mostly free-living heterotrophic protists. The evidence that supports the tree has transitioned from a synthesis of molecular phylogenetics and biological characters to purely molecular phylogenetics. Most current supergroups lack defining morphological or cell-biological characteristics, making the supergroup label even more arbitrary than before. Going forward, the combination of traditional culturing with maturing culture-free approaches and phylogenomics should accelerate the process of completing and resolving the eToL at its deepest levels.
Publisher: The Royal Society
Date: 27-01-2016
Abstract: 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 ersification 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 erse 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 s ling, 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.
Publisher: Public Library of Science (PLoS)
Date: 24-06-2014
Publisher: Proceedings of the National Academy of Sciences
Date: 27-12-2016
Abstract: We created a dataset of dinoflagellate transcriptomes to resolve internal phylogenetic relationships of the group. We show that the dinoflagellate theca originated once, through a process that likely involved changes in the metabolism of cellulose, and suggest that a late origin of dinosterol in the group is at odds with dinoflagellates being the source of this important biomarker before the Mesozoic. We also show that nonphotosynthetic dinoflagellates have retained nonphotosynthetic plastids with vital metabolic functions, and propose that one of these may be the evolutionary source of dinoflagellate bioluminescence. Finally, we reconstruct major molecular and morphological transitions in dinoflagellates and highlight the role of horizontal gene transfer in the origin of their unique nuclear architecture.
Publisher: Wiley
Date: 09-2012
No related grants have been discovered for Fabien Burki.