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Larval RNA Interference in the Red Flour Beetle, Tribolium castaneum
Published on: October 13, 2014
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Cyantraniliprole and Thiamethoxam Exposure Changes Expression of Transcripts Associated with Small Non-Coding RNA
Pierre Bastarache1, Kenan Timani1, Mariem Ben Youssef1
1Department of Chemistry and Biochemistry, Universite de Moncton, 18 Antonine-Maillet Avenue, Moncton, NB E1A 3E9, Canada.
Insects
|March 27, 2024
Summary
Colorado potato beetles develop insecticide resistance through altered small RNA pathways. Ago1 transcript down-regulation reduces survival, suggesting it
Area of Science:
- Entomology
- Molecular Biology
- Biochemistry
Background:
- Colorado potato beetle (Leptinotarsa decemlineata) is a major agricultural pest known for rapid insecticide resistance.
- Insecticide resistance involves complex molecular mechanisms, including alterations in small non-coding RNA pathways.
- Genes regulating small RNA synthesis and function are crucial but not fully characterized in insecticide resistance.
Purpose of the Study:
- To investigate the expression of key small non-coding RNA processing transcripts in L. decemlineata exposed to cyantraniliprole and thiamethoxam.
- To identify specific transcripts modulated by these insecticides and their role in beetle response.
- To evaluate the potential of Ago1 as a target for managing cyantraniliprole resistance.
Main Methods:
- Quantification of Ago1, Ago2, Ago3, Dcr2a, Dcr2b, Expo-5, Siwi-1, and Siwi-2 transcript levels using qRT-PCR.
- Treatment of adult L. decemlineata with varying doses and durations of cyantraniliprole and thiamethoxam.
- RNA interference (RNAi) using dsRNA to down-regulate Ago1 expression followed by insecticide treatment.
Main Results:
- Cyantraniliprole exposure altered Ago1 and Dcr2b transcript levels.
- Thiamethoxam exposure modulated Dcr2a and Siwi-1 transcript levels.
- Down-regulation of Ago1 via dsRNA followed by cyantraniliprole treatment significantly reduced insect survival.
Conclusions:
- Insecticides differentially modulate transcripts involved in small non-coding RNA processing in L. decemlineata.
- Ago1 plays a critical role in the response to cyantraniliprole.
- Ago1 represents a potential target for developing novel strategies against insecticide-resistant Colorado potato beetles.
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