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                <term xml:lang="en">Mosquito</term>
                <term xml:lang="en">Midgut</term>
                <term xml:lang="en">Transcriptomics</term>
                <term xml:lang="en">Resistance</term>
                <term xml:lang="en">RT-qPCR</term>
                <term xml:lang="en">Microarray</term>
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                <term xml:lang="en">Bacillus thuringiensis israelensis</term>
                <term xml:lang="en">Aedes aegypti</term>
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              <p>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.</p>
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