1887

Abstract

SUMMARY

A Rauscher virus (RV)-transformed erythroid cell line, RA-1, was shown to be a non-producer cell line. RA-1 cells express not only gp51–54 -related glycoprotein, but also gp70, which is more closely related to gp51–54 coded by a recombinant gene than to the gp70. RA-1 cells could be infected by Friend, Moloney and Gross viruses, but not by the homologous Rauscher murine leukaemia virus. Rescue of spleen focus-forming activity was obtained on infection of these cells with or , but not with -Gross. The of the RV complex resembles closely that of Friend virus (). It contains a 32S, presumably defective, genome, which most likely is responsible for spleen focus formation, and a 35S helper virus genome. Oligonucleotide fingerprint data suggest that RV has evolved independently of . Erythroid early BFU-E cells of mice infected with RV of Friend helper virus-infected RA-1 cells were shown to require no addition of conditioned medium to form large erythroid colonies (BFU-E) in the presence of only small amounts of erythropoietin.

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1982-11-01
2022-01-28
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