title: Cytochrome P450 gene, CYP4G51, modulates hydrocarbon production in the pea aphid, Acyrthosiphon pisum.
abstract: Terrestrial insects deposit a layer of hydrocarbons (HCs) as waterproofing agents on their epicuticle. The insect-specific CYP4G genes, subfamily members of P450, have been found in all insects with sequenced genomes to date. They are critical for HC biosynthesis in Drosophila; however, their functional roles in other insects including the piercing-sucking hemipterous aphids remain unknown. In this study, we presented the molecular characterization and a functional study of the CYP4G51 gene in the pea aphid, Acyrthosiphon pisum (Harris). CYP4G51 transcript was detectable across the whole life cycle of A. pisum, and was prominently expressed in the aphid head and abdominal cuticle. Up-regulation of CYP4G51 under desiccation stress was more significant in the third instar nymphs compared with the adults. Also, up-regulation of CYP4G51 was observed when the aphids fed on an artificial diet compared with those fed on the broad bean plant, and was positively correlated with a high level of cuticular HCs (CHCs). RNAi knockdown of CYP4G51 significantly reduced its expression and caused reductions in both internal and external HCs. A deficiency in CHCs resulted in aphids being more susceptible to desiccation, with increased mortality under desiccation stress. The current results confirm that CYP4G51 modulates HC biosynthesis to protect aphids from desiccation. Moreover, our data also indicate that saturated and straight-chain HCs play a major role in cuticular waterproofing in the pea aphid. A. pisum CYP4G51 could be considered as a novel RNAi target in the field of insect pest management.
authors.affiliation: State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China. Electronic address: nchen@nwsuaf.edu.cn.
authors.forename: Nan
authors.initials: N
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China. Electronic address: yfan@nwsuaf.edu.cn.
authors.forename: Yong-Liang
authors.initials: YL
authors.lastname: Fan
authors.affiliation: State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China. Electronic address: YyuBai@126.com.
authors.forename: Yu
authors.initials: Y
authors.lastname: Bai
authors.affiliation: State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: lixd@ioz.ac.cn.
authors.forename: Xiang-Dong
authors.initials: XD
authors.lastname: Li
authors.affiliation: State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China. Electronic address: zhanfengfwjt@nwsuaf.edu.cn.
authors.forename: Zhan-Feng
authors.initials: ZF
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China. Electronic address: txliu@nwsuaf.edu.cn.
authors.forename: Tong-Xian
authors.initials: TX
authors.lastname: Liu
mesh_terms: D000818:Animals; D001042:Aphids / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics* / Q000378:metabolism; D006838:Hydrocarbons / Q000378:metabolism*; D019476:Insect Proteins / Q000235:genetics* / Q000378:metabolism; D009758:Nymph / Q000201:enzymology / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D012330:RNA, Double-Stranded / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic; D015854:Up-Regulation
chemical_list: D006838:Hydrocarbons; D019476:Insect Proteins; D012330:RNA, Double-Stranded; D003577:Cytochrome P-450 Enzyme System
keywords: CYP4G subfamily; Cytochrome P450; Hydrocarbon; Pea aphid; RNA interference; Waterproofing