Small GTPase Rab40C is upregulated by 20-hydroxyecdysone and insulin pathways to regulate ovarian development and fecundity  

作　　者：Weiwei Zheng Fangyu Wu Yinhao Ye Tianran Li Zhenyu Zhang Hongyu Zhang 

机构地区：[1]Key laboratory of Horticultural Plant Biology(MOE),Hubei Hongshan Laboratory,Hubei Key Laboratory of Insect Resource Application and Sustainable Pest Control,Institute of Urban and Horticultural Entomology,College of Plant Science and Technology,Huazhong Agricultural University,Wuhan,China

出　　处：《Insect Science》2022年第6期1583-1600,共18页昆虫科学（英文版）

基　　金：supported by the National Key R&D Programof China(grant no.2019YFD1002100);National Natural Science Foundation of China(grant no.31471774);China Agriculture Research System of MOFandMARA(CARS-26).

摘　　要：The insulin and 20-hydroxyecdysone(20E)pathways coordinately regulate in-sect vitellogenesis and ovarian development.However,the detailed molecular mechanisms such as the genes mediating the cooperation of the interaction of these 2 pathways in reg-ulating insect reproductive development are not well understood.In the present study,a small GTPase,Rab4oC,was identified from the notorious agricultural pest Bactrocera dorsalis.In addition to the well-known RAB domain,it also has a unique SOCS-box do-main,which is different from other Rab-GTPases.Moreover,we found that Rab40C was enriched in the ovaries of sexually mature females.RNA interference(RNAi)-mediated knockdown of BdRab40C resulted in a decrease in vitellogenin synthesis,underdevel-oped ovaries,and low fertility.Furthermore,depletion of insulin receptor InR or the het-erodimer receptor of 20E(EcRor USP)by RNAi significantlydecreased the transcription of BdRab40C and resulted in lower fecundity.Further studies revealed that the transcrip-tion of BdRab40C could be upregulated by the injection of insulin or 20E.These results indicate that Rab40C participates in the insulin and 20E pathways to coordinately regulate reproduction in B.dorsalis.Our results not only provide new insights into the insulin-and 20E-stimulated regulatory pathways controlling female reproduction in insects but also contribute to the development of potential eco-friendly strategies for pest control.

关 键 词：ecdysteriod FECUNDITY INSULIN oriental fruit fly Rab40 VITELLOGENIN 

分 类 号：Q96[生物学—昆虫学]