Telonemia, a new protist phylum with affinity to chromist lineages
العنوان: | Telonemia, a new protist phylum with affinity to chromist lineages |
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المؤلفون: | Jahn Throndsen, Kjetill S. Jakobsen, Khadidja Romari, Helge Abildhauge Thomsen, Daniel Vaulot, Marianne A. Minge, Wenche Eikrem, F. Le Gall, Kamran Shalchian-Tabrizi, Ramon Massana, Dag Klaveness, A Botnen |
المصدر: | Digital.CSIC: Repositorio Institucional del CSIC Consejo Superior de Investigaciones Científicas (CSIC) |
بيانات النشر: | Royal Society (Great Britain), 2006. |
سنة النشر: | 2006 |
مصطلحات موضوعية: | Sequence analysis, medicine.disease_cause, DNA, Ribosomal, General Biochemistry, Genetics and Molecular Biology, Environmental sequences, Evolution, Molecular, Phylogenetics, Tubulin, parasitic diseases, medicine, HSP90 Heat-Shock Proteins, Clade, Phylogeny, General Environmental Science, General Immunology and Microbiology, biology, Phylogenetic tree, Ecology, Phylum, fungi, Protist, General Medicine, Sequence Analysis, DNA, Covarion substitution pattern, biology.organism_classification, Telonema, Eukaryotic Cells, Evolutionary biology, Telonemia, Microscopy, Electron, Scanning, France, General Agricultural and Biological Sciences, Cryptophyta, Research Article |
الوصف: | Recent molecular investigations of marine samples taken from different environments, including tropical, temperate and polar areas, as well as deep thermal vents, have revealed an unexpectedly high diversity of protists, some of them forming deep-branching clades within important lineages, such as the alveolates and heterokonts. Using the same approach on coastal samples, we have identified a novel group of protist small subunit (SSU) rDNA sequences that do not correspond to any phylogenetic group previously identified. Comparison with other sequences obtained from cultures of heterotrophic protists showed that the environmental sequences grouped together with Telonema , a genus known since 1913 but of uncertain taxonomic affinity. Phylogenetic analyses using four genes (SSU, Hsp90 , alpha-tubulin and beta-tubulin ), and accounting for gamma- and covarion-distributed substitution rates, revealed Telonema as a distinct group of species branching off close to chromist lineages. Consistent with these gene trees, Telonema possesses ultrastructures revealing both the distinctness of the group and the evolutionary affinity to chromist groups. Altogether, the data suggest that Telonema constitutes a new eukaryotic phylum, here defined as Telonemia, possibly representing a key clade for the understanding of the early evolution of bikont protist groups, such as the proposed chromalveolate supergroup. |
DOI: | 10.1098/rspb.2006.3515 |
URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e61bd3c4e361171b4e89e0dba37f28ca |
حقوق: | OPEN |
رقم الأكسشن: | edsair.doi.dedup.....e61bd3c4e361171b4e89e0dba37f28ca |
قاعدة البيانات: | OpenAIRE |
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