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Stretch-activated ion channels identified in the touch-sensitive structures of carnivorous Droseraceae plants

Carl Procko, View ORCID ProfileSwetha E Murthy, View ORCID ProfileWilliam T Keenan, Seyed Ali Reza Mousavi, Tsegaye Dabi, View ORCID ProfileAdam Coombs, View ORCID ProfileErik Procko, Lisa Baird, View ORCID ProfileArdem Patapoutian, View ORCID ProfileJoanne Chory
doi: https://doi.org/10.1101/2020.12.15.422915
Carl Procko
1Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 N Torrey Pines Rd, La Jolla, CA 92037, USA
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Swetha E Murthy
2Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, 3528 General Atomics Ct, San Diego, CA 92121, USA
5Howard Hughes Medical Institute
6Vollum Institute, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA
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  • ORCID record for Swetha E Murthy
William T Keenan
2Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, 3528 General Atomics Ct, San Diego, CA 92121, USA
5Howard Hughes Medical Institute
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Seyed Ali Reza Mousavi
2Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, 3528 General Atomics Ct, San Diego, CA 92121, USA
5Howard Hughes Medical Institute
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Tsegaye Dabi
1Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 N Torrey Pines Rd, La Jolla, CA 92037, USA
5Howard Hughes Medical Institute
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Adam Coombs
2Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, 3528 General Atomics Ct, San Diego, CA 92121, USA
5Howard Hughes Medical Institute
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Erik Procko
3Department of Biochemistry, University of Illinois at Urbana-Champaign, 315 Roger Adams Laboratory, 600 South Mathews Ave, Urbana IL 61801, USA
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Lisa Baird
4Department of Biology, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
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Ardem Patapoutian
2Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, 3528 General Atomics Ct, San Diego, CA 92121, USA
5Howard Hughes Medical Institute
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  • For correspondence: ardem@scripps.edu chory@salk.edu
Joanne Chory
1Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 N Torrey Pines Rd, La Jolla, CA 92037, USA
5Howard Hughes Medical Institute
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  • For correspondence: ardem@scripps.edu chory@salk.edu
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Abstract

In response to touch, some carnivorous plants such as the Venus flytrap have evolved spectacular movements to capture animals for nutrient acquisition. However, the molecules that confer this sensitivity remain unknown. We used comparative transcriptomics to show that expression of three genes encoding homologs of the MscS-Like (MSL) and OSCA/TMEM63 family of mechanosensitive ion channels are localized to touch-sensitive trigger hairs of Venus flytrap. We focus here on the candidate with the most enriched expression in trigger hairs, the MSL homolog FLYCATCHER1 (FLYC1). We show that FLYC1 transcripts are localized to mechanosensory cells within the trigger hair, transfecting FLYC1 induces chloride-permeable stretch-activated currents in naïve cells, and transcripts coding for FLYC1 homologs are expressed in touch-sensing cells of Cape sundew, a related carnivorous plant of the Droseraceae family. Our data suggest that the mechanism of prey recognition in carnivorous Droseraceae evolved by co-opting ancestral mechanosensitive ion channels to sense touch.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted December 15, 2020.
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Stretch-activated ion channels identified in the touch-sensitive structures of carnivorous Droseraceae plants
Carl Procko, Swetha E Murthy, William T Keenan, Seyed Ali Reza Mousavi, Tsegaye Dabi, Adam Coombs, Erik Procko, Lisa Baird, Ardem Patapoutian, Joanne Chory
bioRxiv 2020.12.15.422915; doi: https://doi.org/10.1101/2020.12.15.422915
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Stretch-activated ion channels identified in the touch-sensitive structures of carnivorous Droseraceae plants
Carl Procko, Swetha E Murthy, William T Keenan, Seyed Ali Reza Mousavi, Tsegaye Dabi, Adam Coombs, Erik Procko, Lisa Baird, Ardem Patapoutian, Joanne Chory
bioRxiv 2020.12.15.422915; doi: https://doi.org/10.1101/2020.12.15.422915

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