Abstract

Temperature-sensitive (ts) mutant viruses have been useful for the study of replication processes in many viral systems. To determine how our panel of MHV-JHM-derived RNA−ts mutants (Robbet al.,1979) is genetically related to other panels of MHV RNA−ts mutants, we tested our mutants for complementation with representatives from two different sets of MHV-A59 ts mutants (Koolenet al.,1983; Schaadet al.,1990). These three ts mutant panels together comprise eight genetically distinct complementation groups. Considerable genetic similarity was observed among the three mutant panels. Only three complementation classes are unique to their particular mutant panel, and genetically equivalent mutants were not observed within the other two mutant panels. There are two overlapping complementation groups between the mutant sets derived from MHV-A59 and four overlapping complementation classes between the MHV-JHM panel and the MHV-A59 panels. Two complementation groups had representative mutants in all three mutant panels. One of these latter complementation classes demonstrated nonreciprocal complementation patterns consistent with intragenic complementation.

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