File:Ancient gene linkages support ctenophores as sister to other animals.pdf
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DescriptionAncient gene linkages support ctenophores as sister to other animals.pdf |
English: A central question in evolutionary biology is whether sponges or ctenophores (comb jellies) are the sister group to all other animals. These alternative phylogenetic hypotheses imply different scenarios for the evolution of complex neural systems and other animal-specific traits. Conventional phylogenetic approaches based on morphological characters and increasingly extensive gene sequence collections have not been able to definitively answer this question. Here we develop chromosome-scale gene linkage, also known as synteny, as a phylogenetic character for resolving this question. We report new chromosome-scale genomes for a ctenophore and two marine sponges, and for three unicellular relatives of animals (a choanoflagellate, a filasterean amoeba and an ichthyosporean) that serve as outgroups for phylogenetic analysis. We find ancient syntenies that are conserved between animals and their close unicellular relatives. Ctenophores and unicellular eukaryotes share ancestral metazoan patterns, whereas sponges, bilaterians, and cnidarians share derived chromosomal rearrangements. Conserved syntenic characters unite sponges with bilaterians, cnidarians, and placozoans in a monophyletic clade to the exclusion of ctenophores, placing ctenophores as the sister group to all other animals. The patterns of synteny shared by sponges, bilaterians, and cnidarians are the result of rare and irreversible chromosome fusion-and-mixing events that provide robust and unambiguous phylogenetic support for the ctenophore-sister hypothesis. These findings provide a new framework for resolving deep, recalcitrant phylogenetic problems and have implications for our understanding of animal evolution. |
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Source | https://www.nature.com/articles/s41586-023-05936-6#article-info |
Author | Darrin T. Schultz, Steven H. D. Haddock, Jessen V. Bredeson, Richard E. Green, Oleg Simakov & Daniel S. Rokhsar |
doi:10.1038/s41586-023-05936-6
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current | 03:55, 25 May 2023 | 1,239 × 1,645, 26 pages (22.38 MB) | Koavf (talk | contribs) | Uploaded a work by Darrin T. Schultz, Steven H. D. Haddock, Jessen V. Bredeson, Richard E. Green, Oleg Simakov & Daniel S. Rokhsar from https://www.nature.com/articles/s41586-023-05936-6#article-info with UploadWizard |
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Publisher | Springer US |
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Software used | Springer |
File change date and time | 13:40, 13 May 2023 |
Date and time of digitizing | 13:39, 13 May 2023 |
Date metadata was last modified | 13:40, 13 May 2023 |
Copyright status | Copyrighted |
Identifier | doi:10.1038/s41586-023-05936-6 |
Encrypted | no |
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Version of PDF format | 1.4 |
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17 May 2023
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22a16c7854b938e4a1768bf205ba25f7fda41245
23,463,505 byte
1,645 pixel
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