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- Title
Larval midgut modifications associated with Bti resistance in the yellow fever mosquito using proteomic and transcriptomic approaches.
- Authors
Tetreau, Guillaume; Bayyareddy, Krishnareddy; Jones, Christopher M.; Stalinski, Renaud; Riaz, Muhammad A.; Paris, Margot; David, Jean-Philippe; Adang, Michael J.; Desprs, Laurence
- Abstract
Background: Bacillus thuringiensis var. israelensis (Bti) is a natural larval mosquito pathogen producing pore-forming toxins targeting the midgut of Diptera larvae. It is used worldwide for mosquito control. Resistance mechanisms of an Aedes aegypti laboratory strain selected for 30 generations with field-collected leaf litter containing Bti toxins were investigated in larval midguts at two levels: 1. gene transcription using DNA microarray and RT-qPCR and 2. differential expression of brush border membrane proteins using DIGE (Differential In Gel Electrophoresis). Results: Several Bti Cry toxin receptors including alkaline phosphatases and N-aminopeptidases and toxin-binding V-ATPases exhibited altered expression levels in the resistant strain. The under-expression of putative Bti-receptors is consistent with Bt-resistance mechanisms previously described in Lepidoptera. Four soluble metalloproteinases were found under-transcribed together with a drastic decrease of metalloproteinases activity in the resistant strain, suggesting a role in resistance by decreasing the amount of activated Cry toxins in the larval midgut. Conclusions: By combining transcriptomic and proteomic approaches, we detected expression changes at nearly each step of the ingestion-to-infection process, providing a short list of genes and proteins potentially involved in Bti-resistance whose implication needs to be validated. Collectively, these results open the way to further functional analyses to better characterize Bti-resistance mechanisms in mosquitoes.
- Subjects
LARVAE; AEDES aegypti; BACILLUS thuringiensis; PATHOGENIC microorganisms; TOXINS
- Publication
BMC Genomics, 2012, Vol 13, Issue 1, p248
- ISSN
1471-2164
- Publication type
Article
- DOI
10.1186/1471-2164-13-248