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Bacillus thuringiensis

ABSTRACT: Produces insect toxin

PROVIDER: PRJNA15523 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	DRR002381_1.fastq.gz	Fastqsanger.gz
	DRR002381_2.fastq.gz	Fastqsanger.gz
	DRR034927_1.fastq.gz	Fastqsanger.gz
	DRR034927_2.fastq.gz	Fastqsanger.gz

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Changes in Gene Expression in the Larval Gut of Ostrinia nubilalis in Response to Bacillus thuringiensis Cry1Ab Protoxin Ingestion

Project description:This microarray was used to monitor gene expression in early third-instar larvae of Bt-susceptible O. nubilalis after 6-h feeding on diet with or without Bacillus thuringiensis (Bt) Cry1Ab protoxin.We identified 174 transcripts, for which the expression was changed more than 2-fold in the gut of the larvae fed Cry1Ab protoxin (p<0.05), representing 80 down-regulated and 94 up-regulated transcripts. Among 174 differentially expressed transcripts, 13 transcripts putatively encode proteins that are potentially involved in Bt toxicity, and these transcripts include eight serine proteases, three aminopeptidases, one alkaline phosphatase, and one cadherin. Cry1Ab protoxin ingestion induced gene expression was measured in O. nubilalis gut at 6 after Cry1Ab protoxin toxin exposure to doses of 0.25 M-NM-<g/ml artificial diet. three independent experiments were performed using three insect gut samples,and each sample was from five insects' gut pooled.

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Comprehensive analysis of gene expression profiles of Spodoptera exigua larvae challenged with Bacillus thuringiensis VIP3A toxin

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.

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Project description: Bacillus thuringiensis Cry toxin is used for insect pest management. When susceptible insect larvae ingest the Bt toxin it shows various physiological and cellular changes. We have employed Agilent One Color matrix based microarray to check the mid-gut gene expression upon Cry toxin exposure in Achaea janata (Castor semilooper). Microarray analysis shows significant variation in gene expression upon Cry toxin exposure.

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