Tackling the conundrum of metazoan phylogenomics: sponges are sister to all other animals

P. Simion, H. Philippe, D. Baurain, M. Jager, D. Richter, A. Di Franco, B Roure, N. Satoh, E. Quéinnec, A. Ereskovsky, P. Lapébie, E. Corre, F. Delsuc, N. King, G. Wörheide, M. Manuel

Результат исследований: Научные публикации в периодических изданияхстатья

158 Цитирования (Scopus)

Аннотация

Resolving the early diversification of animal lineages has proven difficult, even using genome-scale data-sets. Several phylogenomic studies have supported the classical scenario in which sponges (Porifera) are the sister group to all other animals (‘‘Porifera-sis-ter’’ hypothesis), consistent with a single origin of the gut, nerve cells, and muscle cells in the stem lineage of eumetazoans (bilaterians + ctenophores + cnidar-ians). In contrast, several other studies have recov-ered an alternative topology in which ctenophores are the sister group to all other animals (including sponges). The ‘‘Ctenophora-sister’’ hypothesis im-plies that eumetazoan-specific traits, such as neu-rons and muscle cells, either evolved once along the metazoan stem lineage and were then lost in sponges and placozoans or evolved at least twice independently in Ctenophora and in Cnidaria + Bilateria. Here, we report on our reconstruction of deep metazoan relationships using a 1,719-gene dataset with dense taxonomic sampling of non-bilaterian an-imals that was assembled using a semi-automated procedure, designed to reduce known error sources. Our dataset outperforms previous metazoan gene superalignments in terms of data quality and quan-tity. Analyses with a best-fitting site-heterogeneous evolutionary model provide strong statistical sup-port for placing sponges as the sister-group to all other metazoans, with ctenophores emerging as the second-earliest branching animal lineage. Only those methodological settings that exacerbated long-branch attraction artifacts yielded Ctenophora-sis-ter. These results show that methodological issues must be carefully addressed to tackle difficult phylo-genetic questions and pave the road to a better un-derstanding of how fundamental features of animal body plans have emerged.
Язык оригиналаанглийский
Страницы (с-по)958-967
ЖурналCurrent Biology
Том27
Номер выпуска7
СостояниеОпубликовано - 2017

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Предметные области Scopus

  • Биохимия, генетика и молекулярная биология (все)

Цитировать

Simion, P., Philippe, H., Baurain, D., Jager, M., Richter, D., Di Franco, A., ... Manuel, M. (2017). Tackling the conundrum of metazoan phylogenomics: sponges are sister to all other animals. Current Biology, 27(7), 958-967.