Detection of coat protein gene of nervous necrosis virus using loop-mediated isothermal amplification

Jinik Hwang; Sung-Suk Suh; Mirye Park; Myung-Joo Oh; Jong-Oh Kim; Sukchan Lee; Taek-Kyun Lee

doi:10.1016/j.apjtm.2016.01.035

Detection of coat protein gene of nervous necrosis virus using loop-mediated isothermal amplification

Asian Pac J Trop Med. 2016 Mar;9(3):235-40. doi: 10.1016/j.apjtm.2016.01.035. Epub 2016 Jan 13.

Authors

Jinik Hwang¹, Sung-Suk Suh², Mirye Park¹, Myung-Joo Oh³, Jong-Oh Kim³, Sukchan Lee⁴, Taek-Kyun Lee⁵

Affiliations

¹ South Sea Environment Research Department, Korea Institute of Ocean Science and Technology, Geoje 656-830, Republic of Korea; Korea University of Science and Technology, Daejeon 305-350, Republic of Korea.
² South Sea Environment Research Department, Korea Institute of Ocean Science and Technology, Geoje 656-830, Republic of Korea.
³ Department of Aqualife Medicine, Chonnam National University, Yeosu 550-749, Republic of Korea.
⁴ Department of Genetic Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
⁵ South Sea Environment Research Department, Korea Institute of Ocean Science and Technology, Geoje 656-830, Republic of Korea; Korea University of Science and Technology, Daejeon 305-350, Republic of Korea. Electronic address: tklee@kiost.ac.

PMID: 26972393
DOI: 10.1016/j.apjtm.2016.01.035

Abstract

Objective: To establish a novel and highly specific loop-mediated isothermal amplification (LAMP) assay for the identification of nervous necrosis virus (NNV) infection.

Methods: A set of synthesized primers was used to match the sequences of a specific region of the nnv gene from the National Center for Biotechnology Information database, not originating from NNV-infected fish, the efficiency and specificity of LAMP were measured dependent on the concentration of DNA polymerase and the reaction temperature and time. In addition, to determine species-specific LAMP primers, cross reactivity testing was applied to the reaction between NVV and other virus families including viral hemorrhagic septicemia virus and marine birnavirus.

Results: The optimized LAMP reaction carried out at 64 °C for 60 min, and above 4 U Bst DNA polymerase. The sensitivity of LAMP for the detection of nnv was thus about 10 times greater than the sensitivity of polymerase chain reaction. The LAMP assay primers were specific for the detection NNV infection in Epinephelus septemfasciatus.

Conclusions: The development of LAMP primers based on genetic information from a public database, not virus-infected samples, may provide a very simple and convenient method to identify viral infection in aquatic organisms.

Keywords: Loop-mediated isothermal amplification; Nervous necrosis virus; Nodaviridae; Polymerase chain reaction.