Supplementary material and figures from Temperature activated transient receptor potential ion channels from Antarctic fishes ...

• Main Author: York, Julia M.
• Format: Other Non-Article Part of Journal/Newspaper
• Language: unknown
• Published: The Royal Society 2023
• Subjects: Plant Cell and Molecular Biology; Animal Cell and Molecular Biology; Antarctic; Antarc*
• Online Access: https://dx.doi.org/10.6084/m9.figshare.24220342; https://rs.figshare.com/articles/journal_contribution/Supplementary_material_and_figures_from_Temperature_activated_transient_receptor_potential_ion_channels_from_Antarctic_fishes/24220342

Antarctic notothenioid fishes (cryonotothenioids) live in waters that range between −1.86°C and an extreme maximum +4°C. Evidence suggests these fish sense temperature peripherally, but the molecular mechanism of temperature sensation in unknown. Previous work identified transient receptor potential (TRP) channels TRPA1b, TRPM4 and TRPV1a as the top candidates for temperature sensors. Here, cryonotothenioid TRPA1b and TRPV1a are characterized using Xenopus oocyte electrophysiology. TRPA1b and TRPV1a showed heat-evoked currents with Q10s of 11.1 ± 2.2 and 20.5 ± 2.4, respectively. Unexpectedly, heat activation occurred at a threshold of 22.9 ± 1.3°C for TRPA1b and 32.1 ± 0.6°C for TRPV1a. These fish have not experienced such temperatures for at least 15 Myr. Either (1) another molecular mechanism underlies temperature sensation, (2) these fishes do not sense temperatures below these thresholds despite having lethal limits as low as 5°C, or (3) native cellular conditions modify the TRP channels to function at ...