Abstract
This article describes a rapid method for purifying infectious rotavirus particles from cell culture for environmental research. The method is based on size-exclusion chromatography using TOSOH TSKgel® G5000PWXL-CP with a TSKgel® Size Exclusion G2500PWxl guard column, set up on an AKTA Explorer10. Four peaks were identified from the chromatogram and the corresponding fractions were collected and analysed by electron microscopy, 1-step quantitative reverse transcription polymerase chain reaction (RT-PCR) and qNano measurement. Infectivity potential of the recovered virus particles was determined using cell culture. Our analysis reveals that the first fraction contains majority of the intact triple-layered infectious virions while the other three fractions contain mixtures of empty capsids and intact infectious virions. Our results also indicate that there is a gross overestimation of rotaviruses in crude extracts due to encapsidated RNA in the order of 2.3 × 1011 particles and we note that estimates by qNano are similarly skewed (1.36 × 1013 particle) possibly due to empty capsids and cellular debris. In summary we present a method for purification (~12 h) of rotaviruses for a more robust and accurate quantification of virus size, surface charge and particle concentration in environmental contexts.
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Acknowledgments
This study was part of a Marsden Project funded by the Royal Society of New Zealand under Contract Number ESR-1001. Kata Farkas is funded by a PhD scholarship from the Project. We wish to thank Dr. Jeremie Langlet and Dr. Joanne Hewitt (Institute of Environmental Science and Research Ltd.) for their general discussions on virus purification.
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Farkas, K., Pang, L., Lin, S. et al. A Gel Filtration-Based Method for the Purification of Infectious Rotavirus Particles for Environmental Research Applications. Food Environ Virol 5, 231–235 (2013). https://doi.org/10.1007/s12560-013-9122-4
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DOI: https://doi.org/10.1007/s12560-013-9122-4