A genetically engineered cell line resistant to subgroup J avian leukosis virus infection (C/J)

A cell line (DF-1\J) expressing the envelope protein isolated from the ADOL -Hc1 strain of the avian leukosis virus subgroup J (ALV-J) was used to anal yze receptor interference to six different isolates of ALV-J as well as ALV subgroups A-D. The traditional gag-specific enzyme-linked immunosorbent as say (ELISA) as well as flow cytometry was used to evaluate viral infection. The parental cell line (DF-1) was susceptible to all ALV subgroups tested while the DF-1\J cell line was selectively resistant to the subgroup J isol ates. The DF-IU cell line was resistant to infection by all six ALV-J isola tes as determined using the gag-specific ELISA. There was no interference w ith the other ALV subgroups (A-D) induced by the expression of the ADOL-Hcl envelope. The ALV-J isolates used in this analysis are serologically disti nct when analyzed by flow cytometry. Convalescent sera to ADOL-Hcl cross-re acts with all of the ALV-J isolates tested; however, sera to HPRS-103 did n ot bind to four of the six isolates. Based on the intensity and differentia l binding of these antisera using flow cytometry, the six ALV-J isolates us ed can be grouped into four categories. Thus the DF-1\J cell line is resist ant to infection by a serologically and genetically diverse group of ALV-J isolates and should be useful as a diagnostic tool. (C) 1999 Academic Press .