Titel
Characterization of cephalic and non-cephalic sensory cell types provides insight into joint photo- and mechanoreceptor evolution
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Abstract
Rhabdomeric opsins (r-opsins) are light sensors in cephalic eye photoreceptors, but also function in additional sensory organs. This has prompted questions on the evolutionary relationship of these cell types, and if ancient r-opsins were non-photosensory. A molecular profiling approach in the marine bristleworm Platynereis dumerilii revealed shared and distinct features of cephalic and non-cephalic r-opsin1-expressing cells. Non-cephalic cells possess a full set of phototransduction components, but also a mechanosensory signature. Prompted by the latter, we investigated Platynereis putative mechanotransducer and found that nompc and pkd2.1 co-expressed with r-opsin1 in TRE cells by HCR RNA-FISH. To further assess the role of r-Opsin1 in these cells, we studied its signaling properties and unraveled that r-Opsin1 is a Gαq-coupled blue light receptor. Profiling of cells from r-opsin1 mutants versus wild-types, and a comparison under different light conditions reveals that in the non-cephalic cells light – mediated by r-Opsin1 – adjusts the expression level of a calcium transporter relevant for auditory mechanosensation in vertebrates. We establish a deep-learning-based quantitative behavioral analysis for animal trunk movements and identify a light– and r-Opsin-1–dependent fine-tuning of the worm's undulatory movements in headless trunks, which are known to require mechanosensory feedback. Our results provide new data on peripheral cell types of likely light sensory/mechanosensory nature. These results point towards a concept in which such a multisensory cell type evolved to allow for fine-tuning of mechanosensation by light. This implies that light-independent mechanosensory roles of r-opsins may have evolved secondarily.
Stichwort
General Immunology and MicrobiologyGeneral Biochemistry, Genetics and Molecular BiologyGeneral MedicineGeneral Neuroscience
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
eLife
Band
10
ISSN
2050-084X
Erscheinungsdatum
2021
Publication
eLife Sciences Publications, Ltd
Projekt
Kod / Identifikator
260304
Fördergeber
Projekt
Kod / Identifikator
337011
Fördergeber
Projekt
Kod / Identifikator
819952
Fördergeber
... show all
Erscheinungsdatum
2021
Zugänglichkeit
Rechte
Rechteangabe
© 2021, Revilla-i-Domingo et al
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