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- W2960410040 abstract "The evolutionary diversification of animals is one of Earth’s greatest triumphs, yet its origins are still shrouded in mystery. Animals, the monophyletic clade known as Metazoa, evolved wildly divergent multicellular life strategies featuring ciliated sensory epithelia. In many lineages epithelial sensoria became coupled to increasingly complex nervous systems. Currently, different phylogenetic analyses of single-copy genes support mutually-exclusive possibilities that either Porifera or Ctenophora is sister to all other animals. Resolving this dilemma would advance the ecological and evolutionary understanding of the first animals and the evolution of nervous systems. Here we describe a comparative phylogenetic approach based on gene duplications. We computationally identify and analyze gene families with early metazoan duplications using an approach that mitigates apparent gene loss resulting from the miscalling of paralogs. In the transmembrane channel-like (TMC) family of mechano-transducing channels, we find ancient duplications that define separate clades for Eumetazoa (Placozoa + Cnidaria + Bilateria) versus Ctenophora, and one duplication that is shared only by Eumetazoa and Porifera. In the MLX/MLXIP family of bHLH-ZIP regulators of metabolism, we find that all major lineages from Eumetazoa and Porifera (sponges) share a duplication, absent in Ctenophora. These results suggest a new avenue for deducing deep phylogeny by choosing rather than avoiding ancient gene paralogies." @default.
- W2960410040 created "2019-07-23" @default.
- W2960410040 creator A5078805303 @default.
- W2960410040 creator A5088083061 @default.
- W2960410040 date "2019-07-17" @default.
- W2960410040 modified "2023-09-24" @default.
- W2960410040 title "A screen for gene paralogies delineating evolutionary branching order of early Metazoa" @default.
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