Unknown,Transcriptomics,Genomics,Proteomics

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Aedes aegypti Cry11Aa intoxication curve transcriptome

ABSTRACT: Transcriptomic analysis of mosquito larvae exposed to LC50 of Cry11Aa toxin from Bti at different times was conducted to determine defense response pathways in order to better understand the toxin's mode of action and identify possible cellular targets to enhance toxin activity. 4 replicates of 5 intoxication time points and 3 replicates of 2 control timepoints were sequenced on an Illumina platform, analyzed for differential expression with two packages. Read data can be accessed through PRJNA301038 and SRP065731

ORGANISM(S): Aedes aegypti

SUBMITTER: Alejandra Bravo

PROVIDER: E-GEOD-74785 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Host-pathogen interactions result in complex relationship, many aspects of which are not completely understood. Vip proteins, which are Bacillus thuringensis (Bt) insecticidal toxins produced during the vegetative stage, are selectively effective against specific insect pests. This new group of Bt proteins represents an interesting alternative to the classical Bt Cry toxins because current data suggests that they do not share the same mode of action. We have designed and developed a genome-wide microarray for the beet armyworm Spodoptera exigua, a serious lepidopteran pest of many agricultural crops, and used it to better understand how Lepidopteran larvae respond to the treatment with the insecticidal protein Vip3Aa. With this approach, the goal of our study was to evaluate the changes in gene expression levels caused by treatment with sublethal doses (causing 99% growth inhibition) of Vip3Aa at 8 and 24 h after treatment. Results indicated that the toxin provoked a wide transcriptional response, with 19% of unigenes in the microarray responding significantly to treatment. The number of up- and down-regulated unigenes was very similar.. The number of genes whose expression was regulated at 8 h was similar to the number of genes whose expression was regulated after 24 h of treatment. The up-regulated sequences were enriched for genes involved in innate immune response and in pathogen response such as antimicrobial peptides (AMPs) and repat genes. The down-regulated sequences were mainly unigenes with homology to genes involved in metabolism. Genes related to the mode of action of Bt Cry proteins were found, in general, to be slightly overexpressed. The present study is the first genome-wide analysis of the response of lepidopteran insects to Vip3Aa intoxication. An insight into the molecular mechanisms and components related to Vip intoxication will allow designing of more effective management strategies for pest control. Changes in gene expression levels caused by treatment with sublethal doses (causing 99% growth inhibition) of Vip3Aa were measured at 8 and 24 h after treatment by means of custom Spodoptera exigua microarray. Six to seven larvae were used for each time point and three independent experiments were performed at each time point.

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Aedes aegypti Cry11Aa intoxication curve transcriptome

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