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Published on: July 23, 2017
Microarray analysis of acaricide-inducible gene expression in the southern cattle tick, Rhipicephalus (Boophilus)
L Saldivar1, F D Guerrero, R J Miller
1USDA-ARS Knipling-Bushland US Livestock Insects Research Laboratory, Kerrville, TX 78028, USA.
Insect Molecular Biology
|October 7, 2008
Summary
This study investigated how acaricides affect gene expression in Rhipicephalus (Boophilus) microplus larvae. Key genes like glutathione S-transferase were found to be differentially expressed, offering insights into tick resistance mechanisms.
Area of Science:
- Molecular Biology
- Entomology
- Parasitology
Background:
- Rhipicephalus (Boophilus) microplus is a significant cattle parasite.
- Acaricide resistance is a major challenge in tick control.
- Understanding gene expression changes is crucial for developing new control strategies.
Purpose of the Study:
- To identify differentially expressed genes in Rhipicephalus (Boophilus) microplus larvae upon exposure to common acaricides.
- To investigate the molecular mechanisms underlying acaricide resistance in ticks.
Main Methods:
- Microarray analysis using over 13,000 probes from the R. microplus gene index (BmiGI Version 2).
- Exposure of tick larvae to four acaricides: coumaphos, permethrin, ivermectin, and amitraz.
- Validation of microarray data using quantitative reverse transcriptase-PCR and real-time PCR.
Main Results:
- Identified several differentially expressed genes in response to acaricide treatment.
- Notable genes with informative annotations include legumain, glutathione S-transferase, and a putative salivary gland-associated protein.
- Microarray data was confirmed through independent gene expression analysis techniques.
Conclusions:
- Acaricide exposure induces significant changes in gene expression in Rhipicephalus (Boophilus) microplus larvae.
- Genes involved in detoxification (e.g., glutathione S-transferase) and potentially other functions are implicated in the tick's response to acaricides.
- This study provides a foundation for further research into the genetic basis of acaricide resistance in ticks.
