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Altered gene expression in Choristoneura fumiferana and Manduca sexta in response to sublethal intoxication by Bacillus thuringiensis Cry1Ab toxin
Author(s) -
Van Munster M.,
Préfontaine G.,
Meunier L.,
Elias M.,
Mazza A.,
Brousseau R.,
Masson L.
Publication year - 2007
Publication title -
insect molecular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.955
H-Index - 93
eISSN - 1365-2583
pISSN - 0962-1075
DOI - 10.1111/j.1365-2583.2006.00692.x
Subject(s) - manduca sexta , biology , bacillus thuringiensis , manduca , choristoneura fumiferana , toxin , gene expression , proteases , microbiology and biotechnology , gene , biochemistry , tortricidae , enzyme , botany , insect , spruce budworm , larva , genetics , bacteria
In order to understand how lepidopteran insects react physiologically to Bacillus thuringiensis crystal toxin ingestion, transcriptional profiling of Choristoneura fumiferana larvae exposed to sublethal doses of Cry1Ab protoxin were monitored using a C. fumiferana ‐specific cDNA microarray derived from a protoxin‐specific subtractive library. Differential gene expression occurred primarily between 2 and 5 h postingestion. Metabolic enzymes such as lipases and proteases were generally repressed, whereas genes involved in detoxification, immune system regulation or general stress response were upregulated. A similar protoxin‐specific transcriptional pattern was also observed with Manduca sexta larvae, using three upregulated genes (serpin, cytochrome P450 and carboxyl/cholinesterase) and one downregulated gene (β‐glucosidase), suggesting that a susceptible larval response to Cry toxin exposure might be universal among lepidopterous insects.