Evolution of mechano- and chemosensory cell types
Schlosser, Gerhard
Schlosser, Gerhard
Repository DOI
Publication Date
2021-06-18
Type
book part
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Citation
Schlosser, Gerhard. (2021). Evolution of mechano- and chemosensory cell types. In Gerhard Schlosser, Evolutionary origin of sensory and neurosecretory cell types: Vertebrate cranial placodes, Volume 2. Boca Raton: CRC Press.
Abstract
Chapter 3 opens a series of three chapters, which compare the sensory and neurosecretory cell types of the vertebrate head with similar cell types in other animals to get insights into their evolutionary origins. Chapter 3 reviews the evolution of mechano- and chemosensory cells throughout the animal kingdom. Cells mediating these two sensory modalities are considered together because substantial evidence suggests that chemosensory cells have evolved repeatedly from mechanosensory cells. Chapter 3 and the following two chapters use comparisons between vertebrates and their sister group, the tunicates, to infer, which cell types most likely were present in their last common ancestor. Similar comparisons are then made with increasingly distantly related groups (amphioxus, hemichordates/echinoderms, protostomes, cnidarians, sponges) to elucidate cell types present in ancestors of more and more inclusive groups (chordates, deuterostomes, bilaterians, eumetazoans, metazoans). This survey suggests that mechanosensory cell type identity was specified by a core regulatory network (CoRN) of Atonal or Ascl, Pax2/5/8, POU4, Islet, Gfi, Prox and BarH already in the last common ancestor of bilaterians. A CoRN including some of these or related transcription factors (e.g POU4, Islet and PaxB-like) may already have been required to establish the identity of possibly multimodal sensory cell types in the eumetazoan ancestor.
Funder
Publisher
CRC Press
Publisher DOI
https://doi.org/10.1201/9781003160625
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Attribution-NonCommercial-NoDerivatives 4.0 International