Galactose-1-phosphate uridyltransferase and galactokinase activity in cultured human diploid fibroblasts and peripheral blood leukocytes: I. Analysis of transferase genotypes by the ratio of the activities of the two enzymes

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Abstract

The specific activities of galactokinase and galactose-1-phosphate uridyltransferase were determined in peripheral blood leukocytes directly after separation from whole blood, and in cultured skin fibroblasts at various times during the subculture growth period. Growth curves were obtained for fibroblasts based on three different parameters: direct cell counts, total protein, and total deoxyribonucleic acid (DNA) content. At the time in culture when the specific activity of both enzymes was maximal and least variable, the ratio of transferase to galactokinase correlated well with the transferase genotypes of the original tissue donors. Leukocyte transferase: galactokinase ratios gave a similar distribution pattern.

Authors

Thomas A. Tedesco, William J. Mellman