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Polyethylene glycol-1000 (PEG-1000) induced fusion of HPRT (E.C. 2.4.2.8) deficient Chinese hamster cells with alpha-galactosidase A (E.C. 2.3.1.22) deficient cells from a patient with Fabry's disease yielded hybrids which contained both human and hamster HPRT, G6PD (E.C. 1.1.1.49), and APRT (E.C. 2.4.2.7) and Chinese hamster alpha-galactosidase B. Thus PEG-1000 mediated somatic cell fusion led to reexpression of Chinese hamster HPRT. It did not restore the expression of human alpha-galactosidase. Since PEG-1000 treatment of HPRT- Chinese hamster cells in the absence of human cells yielded no HPRT+ cells, it is concluded that the element responsible for the restoration of rodent HPRT was contributed by the human cells and not by the agent employed to promote fusion.
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