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- W2680338049 abstract "Our understanding of the origin of animals has been transformed by characterizing their most closely related, unicellular sisters: the choanoflagellates, filastereans, and ichthyosporeans. Together with animals, these lineages make up the Holozoa [1, 2]. Many traits previously considered animal specific were subsequently found in other holozoans [3, 4], showing that they evolved before animals, although exactly when is currently uncertain because several key relationships remain unresolved [2, 5]. Here we report the morphology and transcriptome sequencing from three novel unicellular holozoans: Pigoraptor vietnamica and Pigoraptor chileana, which are related to filastereans, and Syssomonas multiformis, which forms a new lineage with Corallochytrium in phylogenomic analyses. All three species are predatory flagellates that feed on large eukaryotic prey, and all three also appear to exhibit complex life histories with several distinct stages, including multicellular clusters. Examination of genes associated with multicellularity in animals showed that the new filastereans contain a cell-adhesion gene repertoire similar to those of other species in this group. Syssomonas multiformis possessed a smaller complement overall but does encode genes absent from the earlier-branching ichthyosporeans. Analysis of the T-box transcription factor domain showed expansion of T-box transcription factors based on combination with a non-T-box domain (a receiver domain), which has not been described outside of vertebrates. This domain and other domains we identified in all unicellular holozoans are part of the two-component signaling system that has been lost in animals, suggesting the continued use of this system in the closest relatives of animals and emphasizing the importance of studying loss of function as well as gain in major evolutionary transitions." @default.
- W2680338049 created "2017-06-30" @default.
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- W2680338049 date "2017-07-01" @default.
- W2680338049 modified "2023-10-16" @default.
- W2680338049 title "Novel Predators Reshape Holozoan Phylogeny and Reveal the Presence of a Two-Component Signaling System in the Ancestor of Animals" @default.
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- W2680338049 doi "https://doi.org/10.1016/j.cub.2017.06.006" @default.
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