ReviewPhilosophical transactions of the Royal Society of London. Series B, Biological sciences2015
Gastric pouches and the mucociliary sole: setting the stage for nervous system evolution.
Review in Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 44 papers.
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44 citing papers in PubMed, 114 citations in OpenAlex.
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- Light-modulated neural control of sphincter regulation in the evolution of through-gut.Nature communications · 2024Article
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- Alternative neural systems: What is a neuron? (Ctenophores, sponges and placozoans).Frontiers in cell and developmental biology · 2022Article
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- Profiling cellular diversity in sponges informs animal cell type and nervous system evolution.Science (New York, N.Y.) · 2021Article
- Choanoflagellates and the ancestry of neurosecretory vesicles.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2021Article
- Elementary nervous systems.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2021Review
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- The Enigmatic Reissner's Fiber and the Origin of Chordates.Frontiers in neuroanatomy · 2021Review
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Prerequisite for tracing nervous system evolution is understanding of the body plan, feeding behaviour and locomotion of the first animals in which neurons evolved. Here, a comprehensive scenario is presented for the diversification of cell types in early metazoans, which enhanced feeding efficiency and led to the emergence of larger animals that were able to move. Starting from cup-shaped, gastraea-like animals with outer and inner choanoflagellate-like cells, two major innovations are discussed that set the stage for nervous system evolution. First, the invention of a mucociliary sole entailed a switch from intra- to extracellular digestion and increased the concentration of nutrients flowing into the gastric cavity. In these animals, an initial nerve net may have evolved via division of labour from mechanosensory-contractile cells in the lateral body wall, enabling coordinated movement of the growing body that involved both mucociliary creeping and changes of body shape. Second, the inner surface of the animals folded into metameric series of gastric pouches, which optimized nutrient resorption and allowed larger body sizes. The concomitant acquisition of bilateral symmetry may have allowed more directed locomotion and, with more demanding coordinative tasks, triggered the evolution of specialized nervous subsystems. Animals of this organizational state would have resembled Ediacarian fossils such as Dickinsonia and may have been close to the cnidarian-bilaterian ancestor. In the bilaterian lineage, the mucociliary sole was used mostly for creeping, or frequently lost. One possible remnant is the enigmatic Reissner's fibre in the ventral neural tube of cephalochordates and vertebrates.
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