title: Reverse transcription loop-mediated isothermal amplification for rapid detection of Japanese encephalitis virus in swine and mosquitoes.
abstract: Japanese encephalitis (JE) can infect many agriculturally important animals and humans, and has a high incidence in Asia. One of the natural hosts of the mosquito-borne JE virus (JEV) is domestic pigs, which act as amplifier hosts. Porcine infection results in fatal encephalitis, abortion, and stillbirth in pregnant sows, and hypospermia in boars. In this study, a rapid JEV detection method for swine and mosquitoes was developed based on reverse transcription loop-mediated isothermal amplification (RT-LAMP) targeting the nucleocapsid (E) genes of JEV genotype I (lineage K94PO5), and genotype III (lineage SA14-14-2). Fifty-six swine blood samples and 20,000 mosquitoes were used to evaluate the method, compared to conventional RT-polymerase chain reaction (PCR) and real-time RT-PCR. RT-LAMP had detection limits of 2.57 and 2.34 copies/μL for JEV I and III, respectively. Assay sensitivity was similar to real-time RT-PCR, but was 10-fold higher than conventional RT-PCR. Assay specificity was high, showing no cross-reactivity to other flaviviruses. The results of virus isolation and identification of swine blood samples and mosquito samples were fully consistent with RT-LAMP. Finally, the JEV RT-LAMP assay was simpler and less time consuming than conventional RT-PCR or real-time RT-PCR, since the amplification step could be completed in a single tube within 50 min at 63°C. In conclusion, the newly-developed RT-LAMP assay is an accurate and convenient method for rapid and sensitive diagnosis of JEV in swine and mosquitoes, and may prove to be a practical molecular tool for surveillance and epidemiological investigations.
authors.affiliation: College of Animal Science and Veterinary Medicine, Jilin University, Changchun, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Liu
authors.forename: Zhen-Jiang
authors.initials: ZJ
authors.lastname: Liu
authors.forename: Jie
authors.initials: J
authors.lastname: Jing
authors.forename: Jing-Qiang
authors.initials: JQ
authors.lastname: Ren
authors.forename: Yan-Yu
authors.initials: YY
authors.lastname: Liu
authors.forename: Huan-Huan
authors.initials: HH
authors.lastname: Guo
authors.forename: Min
authors.initials: M
authors.lastname: Fan
authors.forename: Hui-Jun
authors.initials: HJ
authors.lastname: Lu
authors.forename: Ning-Yi
authors.initials: NY
authors.lastname: Jin
mesh_terms: D000818:Animals; D009033:Culicidae / Q000821:virology*; D017931:DNA Primers / Q000235:genetics; D004197:Disease Reservoirs; D004664:Encephalitis Virus, Japanese / Q000235:genetics / Q000302:isolation & purification*; D004672:Encephalitis, Japanese / Q000175:diagnosis / Q000453:epidemiology / Q000662:veterinary*; D005260:Female; D006801:Humans; D007303:Insect Vectors / Q000821:virology*; D057230:Limit of Detection; D019590:Nucleocapsid Proteins / Q000235:genetics*; D011247:Pregnancy; D012367:RNA, Viral / Q000097:blood; D012015:Reference Standards; D020133:Reverse Transcriptase Polymerase Chain Reaction; D048348:Reverse Transcription / Q000235:genetics; D012680:Sensitivity and Specificity; D013552:Swine; D013553:Swine Diseases / Q000175:diagnosis* / Q000453:epidemiology / Q000821:virology; D013997:Time Factors; D015047:Zoonoses
chemical_list: D017931:DNA Primers; D019590:Nucleocapsid Proteins; D012367:RNA, Viral