Function and Characterization of the Argonaute2 Gene in the RNA Interference Pathway in the Diamondback Moth

Hameed, Muhammad SalmanXiaodong, JingWei, ChenJinzhi, ChenLiette, VasseurGefu, Wang-PruskiGuang, Yang2020-04-232020-04-232019-12Hameed Muhammad Salman, Xiaodong Jing, Wei Chen, Jinzhi Chen, Liette Vasseur, Gefu Wang-Pruski, Guang Yang. Function and Characterization of the Argonaute2 Gene in the RNA Interference Pathway in the Diamondback Moth. International Journal of Applied Biology and Pharmaceutical Technology. 2019 Dec; 10(4): 35-510976-4550http://imsear.searo.who.int/handle/123456789/198218Arch BiochemMol Biol2019;10(4):035-051DOI: 10.26502/abmb.007Archives of Biochemistry and Molecular BiologyVol. 10 No. 4 -December2019. 36AbstractArgonaute2 (AGO2) is a core catalytic component of the RNA-induces silencing complex (RISC) that binds to small guide RNAs containing small interfering RNA (siRNA) and microRNA (miRNA). The guide RNA leads RISC to the complementary mRNA for gene suppression. We cloned the full length cDNA (2193 bp) of the Ago2gene (PxAgo2) from diamondback moth (DBM, Plutella xylostella). The predicted PxAgo2 protein hadan83 kDa molecular weight withatheoretical isoelectric point of 9.39. The phylogenetic tree showed a high similarity of PxAgo2with Bombyx moriAgo2 (BmAgo2). Western blot and RT-qPCR analyses showed a clear increase in the PxAgo2 mRNA and protein expression levels in the egg, 4thinstar larva, pre-pupa, pupa and adult. The double-stranded RNA-mediated RNAi of PxAgo2in DBM larvae was found 3 h after dsRNA injection,and the knockdown level was increased over time up to 36 h. PxAgo2silencing recovered the expression of PxBurs-?(Bursicon-? inDBM) to the normal expression level, which was suppressed bydsPxBurs-?in a DBM cell line. The overexpression of PxAgo2fundamentally enhanced the PxBurs-? silencing efficiency in DBM cells. Our findings reveal that PxAgo2is involved in the dsRNA-regulated gene silencing mechanism and performs a crucial function in the RNAi process ofDBMPlutella xylostellaPxAgo2double-stranded RNARNAi mechanismFunction and Characterization of the Argonaute2 Gene in the RNA Interference Pathway in the Diamondback MothJournal ArticleIndiaDepartment of Plant Protection, Faculty of Agricultural Sciences, Ghazi University, Dera Ghazi Khan 32200, Pakistan, mhameed@gudgk.edu.pkState Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, (Fujian Province University) Fujian Agriculture and Forestry University, Fuzhou 350002, ChinaState Key Laboratory of Ecological Pest Control for Fujian and Taiwan crops, Institute of Applied Ecology (Fujian Province University) Fujian Agriculture and Forestry University, Fuzhou 350002, ChinaJoint International Research Laboratory of Ecological Pest Control, Ministry of Education, Fuzhou 350002, ChinaKey Laboratory of Integrated Pest Management for Fujian-Taiwan Crops, Ministry of Agriculture, Fuzhou 350002, ChinaKey Laboratory of Green Pest Control (Fujian Province University), Fujian Agriculture and Forestry University, Fuzhou 350002, ChinaDepartment of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, CanadaDepartment of Plant, Food and Environmental Sciences, Faculty of Agriculture, Dalhousie University, PO Box 550, Truro, Nova Scotia B2N 5E3, Canada