GEPHE SUMMARY Print
Gephebase Gene
Entry Status
Published
GepheID
GP00002464
Main curator
Courtier
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
Ostrinia furnacalis - Bt-Cry1Ac susceptible
Trait State in Taxon B
Ostrinia furnacalis - Bt-Cry1Ac resistant lab selected strain
Ancestral State
Taxon A
Taxonomic Status
Taxon A
Common Name
Asian corn borer
Synonyms
Asian corn borer; Ostrinia furnacalis (Guenee, 1854); Ostrinia furnicalis
Rank
species
Lineage
Show more ... apoda; Insecta; Dicondylia; Pterygota; Neoptera; Holometabola; Amphiesmenoptera; Lepidoptera; Glossata; Neolepidoptera; Heteroneura; Ditrysia; Obtectomera; Pyraloidea; Crambidae; Pyraustinae; Ostrinia
NCBI Taxonomy ID
is Taxon A an Infraspecies?
No
Taxon B
Common Name
Asian corn borer
Synonyms
Asian corn borer; Ostrinia furnacalis (Guenee, 1854); Ostrinia furnicalis
Rank
species
Lineage
Show more ... apoda; Insecta; Dicondylia; Pterygota; Neoptera; Holometabola; Amphiesmenoptera; Lepidoptera; Glossata; Neolepidoptera; Heteroneura; Ditrysia; Obtectomera; Pyraloidea; Crambidae; Pyraustinae; Ostrinia
NCBI Taxonomy ID
is Taxon B an Infraspecies?
No
GENOTYPIC CHANGE
Presumptive Null
Molecular Type
Aberration Type
Deletion Size
10-99 bp
Molecular Details of the Mutation
MPR-r2 has a 26-amino acid residue deletion in the TBR which results in reduced binding of Cry1Ac compared to the MPR from the susceptible strain.
Experimental Evidence
Authors
Jin T; Chang X; Gatehouse AM; Wang Z; Edwards MG; He K
Abstract
Development of resistance in target pests is a major threat to long-term use of transgenic crops expressing Bacillus thuringiensis (Bt) Cry toxins. To manage and/or delay the evolution of resistance in target insects through the implementation of effective strategies, it is essential to understand the basis of resistance. One of the most important mechanisms of insect resistance to Bt crops is the alteration of the interactions between Cry toxins and their receptors in the midgut. A Cry1Ac-selected strain of Asian corn borer (ACB), Ostrinia furnacalis, a key pest of maize in China, evolved three mutant alleles of a cadherin-like protein (OfCAD) (MPR-r1, MPR-r2 and MPR-r3), which mapped within the toxin-binding region (TBR). Each of the three mutant alleles possessed two or three amino acid substitutions in this region, especially Thr1457→Ser. In highly resistant larvae (ACB-Ac200), MPR-r2 had a 26-amino acid residue deletion in the TBR, which resulted in reduced binding of Cry1Ac compared to the MPR from the susceptible strain, suggesting that the number of amino acid deletions influences the level of resistance. Furthermore, downregulation of OfCAD gene (ofcad) transcription was observed in the Cry1Ac resistant strain, ACB-Ac24, suggesting that Cry1Ac resistance in ACB is associated with the downregulation of the transcript levels of the cadherin-like protein gene. The OfCAD identified from ACB exhibited a high degree of similarity to other members of the cadherin super-family in lepidopteran species.
RELATED GEPHE
Related Genes
No matches found.
Related Haplotypes
1
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