Abstract
IgG1-secreting variants have been isolated from three different IgM-secreting hybridomas, in two instances following in vitro immunization. The method used was based on sequential sublining in combination with selection by an IgG1-specific two-site ELISA system employing two different IgG1-specific polyclonal antisera. Idiotypic identity between the IgG1 variants and their respective IgM parent was demonstrated using syngeneic anti-idiotypic antisera. The antigen binding specificity in the IgG1 variants was also conserved. Isolation of naturally occurring IgG1 switch variants from IgM-secreting hybridomas that are produced after in vivo immunization offers a solution to the major disadvantages associated with the generation of IgM hybridomas.
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