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Title

Rapid selection in modified BHK-21 cells of a foot-and-mouth disease virus variant showing alterations in cell tropism

AuthorsEscarmís, Cristina; Carrillo, Elisa C.; Ferrer, Marcela; García Arriaza, Juan Francisco; López, Nora; Tami, Cecilia; Verdaguer, Núria ; Domingo, Esteban ; Franze-Fernández, Maria T.
KeywordsFoot-and-mouth disease
Issue Date1998
PublisherAmerican Society for Microbiology
CitationJournal of Virology, 1998, p. 10171-10179, Vol. 72, No. 12
AbstractWith persistent foot-and-mouth disease virus (FMDV) in BHK-21 cells, there is coevolution of the cells and the resident virus; the virulence of the virus for the parental BHK-21 cells is gradually increased, and the cells become partially resistant to FMDV. Here we report that variants of FMDV C3Arg/85 were selected in a single infection of partially resistant BHK-21 cells (termed BHK-Rb cells). Indirect immunofluorescence showed that the BHK-Rb cell population was heterogeneous with regard to susceptibility to C3Arg/85 infection. Infection of BHK-Rb cells with C3Arg/85 resulted in an early phase of partial cytopathology which was followed at 6 to 10 days postinfection by the shedding of mutant FMDVs, termed C3-Rb. The selected C3-Rb variants showed increased virulence for BHK-21 cells, were able to overcome the resistance of modified BHK-21 cells to infection, and had acquired the ability to bind heparin and to infect wild-type Chinese hamster ovary (CHO) cells. A comparison of the genomic sequences of the parental and modified viruses revealed only two amino acid differences, located at the surface of the particle, at the fivefold axis of the viral capsid (Asp-9Ala in VP3 and either Gly-110Arg or His-108Arg in VP1). The same phenotypic and genotypic modifications occurred in a highly reproducible manner; they were seen in a number of independent infections of BHK-Rb cells with viral preparation C3Arg/85 or with clones derived from it. Neither amino acid substitutions in other structural or nonstructural proteins nor nucleotide substitutions in regulatory regions were found. These results prove that infection of partially permissive cells can promote the rapid selection of virus variants that show alterations in cell tropism and are highly virulent for the same cells.
Publisher version (URL)http://jvi.asm.org/cgi/content/full/72/12/10171
URIhttp://hdl.handle.net/10261/8545
ISSN0022-538X
E-ISSN1098-5514
Appears in Collections:(CBM) Artículos
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