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Establishment of cell lines persistently infected with foot-and-mouth disease virus


Establishment of cell lines persistently infected with foot-and-mouth disease virus



Virology 145(1): 24-35



ISSN/ISBN: 0042-6822

PMID: 2990100

DOI: 10.1016/0042-6822(85)90198-9

Cell lines persistently infected with foot-and-mouth disease virus (FMDV) have been established by growth of BHK-21 (c-13) or IBRS-2 (c-26) that survived standard cytolytic infections with FMDV. They maintain cytoplasmic FMDV RNA sequences, as shown by dot blot hybridization tests, using cloned FMDV cDNA as probes. Cell line C1-BHK-Rc1 was derived by infection of cloned BHK-21 c1 cells and plaque-purified FMDV C-S8 c1. Indirect immunofluorescence assays indicated the presence of FMDV antigens. It was resistant to superinfection by FMDV C-S8 c1, O-S7, or A5, but not by encephalomyocarditis virus (EMCV), vesicular stomatitis virus (VSV), or Semliki forest virus (SFV). Infectious FMDV was detected in the culture medium only up to cell passage 65. The virus isolated from C1-BHK-Rc1 cells showed decreased plaque size and diminished yield in infections at 42 degrees. Multiple mutations in the intracellular FMDV RNA have been detected by T1 oligonucleotide fingerprinting of genomic RNA segments hybridized to FMDV cDNA fragments. At late cell passages, when no infectious FMDV is detected, cells continue to express viral antigens and FMDV RNAs with deletions of up to 3 kb have been identified by Northern blot analysis. We conclude that persistent infections of cell cultures with FMDV are readily established and that multiple genetic and phenotypic variations occur in the virus during persistence.

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Accession: 040050145

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