CRISPR/Cas9-mediated PBP1 and PBP3 mutagenesis induced significant reduction in electrophysiological response to sex pheromones in male Chilo suppressalis

• 来源期刊: 中国昆虫科学（英文版）
• 关键词: CRISPR/Cas9 system electroantennogram pheromone binding protein sex pheromone striped stem borer
• 年，卷（期）: 2019,（3）
• 页码范围: 388-399
• 页数: 12页
• 语种: 英文
• DOI: 10.1111/1744-7917.12544

摘要

Pheromone-binding proteins (PBPs) are thought to bind and transport sex pheromones onto the olfactory receptors on the dendrite membrane of olfactory neurons,and thus play a vital role in sex pheromone perception.However,the function of PBPs has rarely been demonstrated in vivo.In this study,two PBPs (PBP1 and PBP3) of Chilo suppressalis,one of the most notorious pyralid pests,were in vivo functionally characterized using insects with the PBP gene knocked out by the CRISPR/Cas9 system.First,through direct injection of PBP-single guide RNA (sgRNA)/Cas9 messenger RNA into newly laid eggs,a high rate of target-gene editing (checked with polled eggs) was induced at 24 h after injection,21.3％ for PBP1-sgRNA injected eggs and 19.5％ for PBP3-sgRNA injected eggs.Second,by an in-crossing strategy,insects with mutant PBP1 or PBP3 (both with a premature stop codon) were screened,and homozygous mutants were obtained in the G3 generation.Third,the mutant insects were measured for electroantennogram (EAG) response to female sex pheromones.As a result,both PBP mutant males displayed significant reduction in EAG response,and this reduction in PBP 1 mutants was higher than that in PBP3 mutants,indicating a more important role of PBP 1.Finally,the relative importance of two PBPs and the possible off target effect induced by sgRNA-injection are discussed.Taken together,our study provides a deeper insight into the function of and interaction between different PBP genes in sex pheromone perception of C.suppressalis,as well as a valuable reference in methodology for gene functional study in other genes and other moth species.