Development of a method for the detection of infectious myonecrosis virus by reverse-transcription loop-mediated isothermal amplification and nucleic acid lateral flow hybrid assay.
We report the development of a reverse-transcription loop-mediated isothermal amplification and nucleic acid lateral flow method (RT-LAMP-NALF) for detection of infectious myonecrosis virus (IMNV). The RT-LAMP-NALF method combines simplified nucleic acid extraction, a reverse-transcription loop-mediated isothermal amplification platform, and one-step visual colorimetric confirmation of the IMNV amplified sequences using a generic NALF qualitative detection test strip. The sensitivity of RT-LAMP (using two and three primer pairs) and nested RT-LAMP (using three primer pairs) was compared by real-time reverse-transcription-polymerase chain reaction (RT-PCR) using TaqMan probe. The detection of RT-LAMP (three primer pairs) products was accomplished by using a NALF-test strip. The RT-LAMP-NALF showed equivalent sensitivity to RT-LAMP (using three primer pairs), and it was found to be 100 and 10 times more sensitive than one-step RT-PCR and RT-LAMP (two primer pairs), respectively. On the other hand, the RT-LAMP-NALF was 10 and 100 times less sensitive than nested RT-PCR and real-time RT-PCR, respectively. The simplified RNA extraction method ranged from 4.4 x 10(6) to 2.2 x 10(8) IMNV copy numbers microL(-1) RNA, and it was similar with the standard RNA extraction (from 1.2 x 10(6) to 6.3 x 10(7) IMNV copy numbers microL(-1) RNA). These results clearly demonstrate that the RT-LAMP-NALF method is specific, sensitive, can shorten the time for analysis, and has potential application for IMNV diagnosis in resource-poor diagnostic settings.
Andrade
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Department of Veterinary Science and Microbiology, University of Arizona, Tucson, AZ 85721, USA. thalespda@hotmail.com
Lightner
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D000818:Animals; D017756:Aquaculture / Q000379:methods*; D001483:Base Sequence; D008969:Molecular Sequence Data; D021141:Nucleic Acid Amplification Techniques / Q000379:methods*; D009693:Nucleic Acid Hybridization / Q000379:methods*; D033561:Penaeidae / Q000821:virology*; D012328:RNA Viruses / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016415:Sequence Alignment