Abstract
Selective glucose-free media have been used to study the reexpression of liver-specific gluconeogenic enzymes in rat hepatoma × mouse lymphoblastoma somatic hybrids. The utilization for gluconeogenesis of dihydroxyacetone or oxaloacetate requires two enzymes: fructose diphosphatase as well as either triokinase for the former or phosphoenolpyruvate carboxykinase for the latter. By sequential selection with these substrates, the reexpression of the three gluconeogenic enzymes has been dissociated. The reexpression of these enzymes is correlated with the loss of mouse chromosomes. In addition, the characterization of the parental forms of aldolase B, another liver-specific enzyme, shows that reexpression corresponds to the simultaneous production of the rat and mouse enzymes. These results demonstrate the chromosomal origin of extinction and suggest that activation of mouse silent genes which accompanies reexpression can occur without loss of the parental determinations. The hypothesis that determination involves regulatory rather than structural genes is discussed.
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Bertolotti, R. Expression of differentiated functions in hepatoma cell hybrids: Selection in glucose-free media of segregated hybrid cells which reexpress gluconeogenic enzymes. Somat Cell Mol Genet 3, 579–602 (1977). https://doi.org/10.1007/BF01539067
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DOI: https://doi.org/10.1007/BF01539067