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A Fast Replica Plating Technique for the Isolation of Post-integration Mutants of the Moloney Strain of Murine Leukaemia Virus

Department of Microbiology and School of Basic Medical Sciences, University of Illinois, Urbana, Illinois 61801, U.S.A.

Seven temperature-sensitive (ts) mutants of Moloney murine leukaemia virus (Mo-MuLV) were isolated using a rapid, non-selective replica plating technique designed to select for post-integration mutants. Thymus-bone marrow (TB) cells, infected with mutagenized virus, were cloned and incubated at the non-permissive temperature (39 °C) for 10 days. The resulting colonies were screened for production of virus by replica plating supernatant from the ‘master’ tray on to a second tray pre-seeded with fu-1 (a cell line derived from L8 myoblasts) indicator cells. The ‘master’ tray was shifted to the permissive temperature (34 °C) for 48 h, then re-screened for virus production. Any colony on the ‘master’ tray which produced syncytia-inducing virus at 34 °C but not at 39 °C was potentially producing a ts mutant. Preliminary characterization by shift-down experiments and scanning electron microscopy of three of the ts mutants isolated by this technique revealed a mutant blocked before budding, one blocked at an early stage in the budding process and one with a defect after release of the virus.

Received 16 November 1979; accepted 19 March 1980.