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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Characterization of a feline sarcoma virus-coded antigen (FOCMA-S) by radioimmunoassay.

A radioimmunoassay has been developed that detects a unique antigen encoded by the genome of the feline sarcoma virus (FeSV). Pseudotype viral particles containing an FeSV-specific polyprotein (p85) were used both as a source of antigen and to prepare specific antisera in rabbits. Because p85 contains antigens related to two structural proteins ( p15 and p12) of feline leukemia virus (FeLV), antibodies directed to these were adsorbed with purified FeLV proteins. The adsorbed rabbit antiserum bound to antigenic determinants (designated FOCMA-S) which are also present in p85 and reacted specifically in immunofluorescence tests with rat cells transformed by FeSV and with FOCMA-positive cat lymphoid tumor cells. Competition assays detect FOCMA-S in pseudotype type C viruses rescued from FeSV-transformed mink and rat cells but not in heterologous type C helper viruses or in FeLV. A crossreactive antigen was also detected in pseudotypes of Kirsten sarcoma virus. The assay permits the quantitative measurement of an FeSV-coded protein whose expression is associated with viral transformation.[1]


  1. Characterization of a feline sarcoma virus-coded antigen (FOCMA-S) by radioimmunoassay. Sherr, C.J., Todaro, G.J., Sliski, A., Essex, M. Proc. Natl. Acad. Sci. U.S.A. (1978) [Pubmed]
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