Abstract
Chinese tree shrews have been used extensively in studies of different types of cancer and for the modeling of viral infections. In the present study, we report the isolation and characterization of two strains of mammalian orthoreovirus (MRV), MRV1/TS/2011 and MRV3/TS/2012, which were isolated from the feces of tree shrews in Yunnan, China. These two strains of MRV were isolated and cultured in both primary tree shrew intestinal epithelial cells (pTIECs) and primary tree shrew alveolar epithelial cells (pTAECs). A neutralization test using immunofluorescence was employed to determine the subtype of each isolate. Viral RNA was extracted and analyzed by polyacrylamide gel electrophoresis (PAGE), and the sequence was determined by next-generation sequencing for construction of a phylogenetic tree and analysis of gene polymorphism. Electron microscopy examination revealed the presence of virus particles with the typical morphological characteristics of MRV. Serotype analysis showed that strain MRV1/TS/2011 was of type I and strain MRV3/TS/2012 was of type III. A sequence comparison showed that the isolates were 25.4% identical in the S1 gene.
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Acknowledgements
This study was financially supported by the National Science and Technology Support Program (Grant No. 2014BAI01B00), the Yunnan Joint Support for National Program (Grant No. 2015GA009), the Yunnan Science and Technology Talent and Platform Program (Grant No. 2017HC019), Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases (Grant No. KF2015-01), and Yunnan Province Major Science and Technology Project (Grant No. 2017ZF007).
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XL and JD designed the study, performed the experiments, and drafted the manuscript. XS carried out virus purification and concentration. BY performed isolation and cultivation of intestinal epithelial cells of the tree shrew. PT observed and recorded the results.
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Li, X., Sun, X., Lu, C. et al. Isolation and identification of two new strains of mammalian orthoreovirus from Chinese tree shrews. Arch Virol 165, 1541–1550 (2020). https://doi.org/10.1007/s00705-020-04635-1
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DOI: https://doi.org/10.1007/s00705-020-04635-1