数字农科院2.0

Microrna Profiling Between Bacillus Thuringiensis C.ry1Ab-Susceptible And -Resistant European C orn Borer, Ostrinia Nubilalis (Hubner)

文献类型： 外文期刊

作者： Li, X.;Yu, T.;Coates, B. -S.;Zhang, Q.;Zhang, Q.;Li, X.;Zhou, X.;Siegfried, B. -D.

作者机构：

关键词： European corn borer; Ostrinia nubilalis; miRNA; Cry1Ab; Bt resistance

期刊名称： INSECT MOLECULAR BIOLOGY

ISSN： 0962-1075

年卷期： 2018 年 27 卷 3.0 期

页码：

收录情况： JCR（2021版）

摘要： Transgenic maize hybrids that express insecticidal Bacillus thuringiensis (Bt) crystalline (Cry) protein toxins effectively protect against the European corn borer, Ostrinia nubilalis, a devastating maize pest. Field monitoring and laboratory selections have detected varying levels of O.nubilalis resistance to Cry1Ab toxin. MicroRNAs (miRNAs) are short noncoding RNAs that are involved in post-transcriptional gene regulation. Their potential roles in the evolution of Bt resistance, however, remain largely unknown. Sequencing of small RNA libraries from the midgut of Cry1Ab-susceptible and resistant O.nubilalis larvae resulted in the discovery of 277 miRNAs, including 248 conserved and 29 novel. Comparative analyses of miRNA expression profiles between the laboratory strains predicted 26 and nine significantly up- and down-regulated transcripts, respectively, in the midgut of Cry1Ab resistant larvae. Amongst 15 differentially regulated miRNAs examined by quantitative real-time PCR, nine (60%) were validated as cosegregating with Cry1Ab resistance in a backcross progeny. Differentially expressed miRNAs were predicted to affect transcripts involved in cell membrane components with functions in metabolism and binding, and the putative Bt-resistance genes aminopeptidase N and cadherin. These results lay the foundation for future investigation of the potential role of miRNAs in the evolution of Bt resistance.

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