Journal
INSECT MOLECULAR BIOLOGY
Volume 25, Issue 4, Pages 370-384Publisher
WILEY
DOI: 10.1111/imb.12231
Keywords
TRPA1; thermosensation; mirid; Apolygus lucorum; chemosensation
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Funding
- National Genetically Modified Organisms Breeding Major Project [2012ZX08009001]
- National Natural Science Foundation of China [31321004, 31471833]
- ARS [ARS-0428993, 813737] Funding Source: Federal RePORTER
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As signal integrators that respond to various physical and chemical stimuli, transient receptor potential (TRP) channels fulfil critical functional roles in the sensory systems of both vertebrate and invertebrate organisms. Here, four variants of TRP ankyrin 1 (TRPA1) were identified and cloned from the green plant bug, Apolygus lucorum. Spatiotemporal expression profiling across development and in different adult tissues revealed that the highest relative-transcript levels occurred in first-instar nymphs and antennae, respectively. In Xenopus laevis-based functional assays, Apo. lucorum TRPA1-A (AlucTRPA1-A), AlucTRPA1-B and AlucTRPA1-C were activated by increasing the temperature from 20 to 40 degrees C with no significant desensitization observed after repeated temperature stimuli. The activation temperature of AlucTRPA1-A and AlucTRPA1-B was <25 degrees C, whereas the activation temperature of AlucTRPA1-C was between 25 and 30 degrees C. Amongst the variants, only AlucTRPA1-A and AlucTRPA1-C were directly activated by high concentrations of allyl isothiocyanate, cinnamaldehyde and citronellal. Taken together, these results suggest that AlucTRPA1 variants may function in vivo as both thermal and chemical sensors, with the four variants potentially mediating different physiological functions. This study not only enriches our understanding of TRPA1 function in Hemiptera (Miridae), but also offers a foundation for developing new pest control strategies.
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