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Midgut de novo transcriptome analysis and gene expression profiling of Achaea janata larvae exposed with Bacillus thuringiensis (Bt)-based biopesticide formulation.
Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics 2019 Februrary 16
India is the major producer and exporter of castor oil in the world. Castor semilooper, Achaea janata is one of the main castor crop pests, which causes serious economic loss of crop, hence management and control of the pest are important. Currently, Bacillus thuringiensis (Bt) based biopesticides are being used for their control. However, the insects are known to develop resistance not only against chemical pesticides but also to Bt based biopesticides. In the present study, de novo transcriptome analysis was conducted to monitor the expression pattern of larval midgut genes in Achaea janata exposed to sublethal dose of Bt formulation. A total of 34,612 and 41,109 transcripts were identified in control and toxin-exposed larval midgut samples out of which 18,836 in control and 21,046 in toxin-exposed samples are annotated. Microarray data analysis employed to monitor the gene expression upon Cry toxin exposure revealed that 375 genes were upregulated and 579 genes were downregulated during all the time points (12-60 h) of toxin exposure. The differentially expressed transcripts include i.e. Cry toxin receptors, gut proteases, arylphorin, REPATs, detoxification enzymes and aquaporins. Validation of microarray data was performed by real-time quantitative PCR using few randomly selected genes and the results obtained were in corroboration. This is the first study on transcriptome data from the castor semilooper and the results would provide valuable resources for the characterization of Bt toxin response in the pest.
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