Rapid detection of human rotavirus using colorimetric nucleic acid sequence-based amplification (NASBA)-enzyme-linked immunosorbent assay in sewage treatment effluent.
A colorimetric nucleic acid sequence-based amplification-enzyme-linked immunosorbent assay (NASBA-ELISA) was developed for rapid detection and identification of human rotavirus. Oligonucleotide primers targeting gene 9 encoding a serotype-specific antigen VP7 were selected and used for the amplification of viral RNA by the isothermal NASBA process, resulting in the accumulation of biotinylated RNA amplicons. Amplicons were hybridized with a specific amino-linked oligonucleotide probe covalently immobilized on microtiter plates. The DNA-RNA hybrids were colorimetrically detected by the addition of streptavidin-peroxidase conjugate and tetramethylbenzidine substrate. Using the NASBA-ELISA system, as little as 0.2 PFU (4 x 10(1) PFU ml(-1)) and 15 PFU (3 x 10(3) PFU ml(-1)) of rotavirus were detected within 6 h in spiked MQ water and sewage treatment effluent respectively. No interference was encountered in the amplification and detection of rotavirus in the presence of non-target RNA or DNA. Moreover, the presence of non-target bacteria and virus does not generate any non-specific signal, confirming the specificity of the developed NASBA-ELISA system and its effectiveness in specifically detecting rotavirus. The NASBA-ELISA system offers several advantages in terms of sensitivity, rapidity and simplicity. This technique should be readily adaptable for detection of other RNA viruses in both foods and clinical samples.
Jean
Julie
J
Centre de Recherche STELA, Département de Sciences des Aliments et de Nutrition, Université Laval, QC, Canada G1K 7P4.
Blais
Burton
B
Darveau
André
A
Fliss
Ismaïl
I
D001483:Base Sequence; D003124:Colorimetry; D017931:DNA Primers; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D006801:Humans; D009693:Nucleic Acid Hybridization; D012037:Refuse Disposal / Q000379:methods; D012401:Rotavirus / Q000302:isolation & purification*; D021161:Self-Sustained Sequence Replication / Q000379:methods*; D012722:Sewage / Q000821:virology*
D017931:DNA Primers; D012722:Sewage