Abstract
A patient was previously characterized as having a variant form of G M1 gangliosidosis based on severe deficiencies in β-galactosidase activity in both leukocytes and fibroblasts using 4-methylumbelliferyl-β-D-galactoside and G M1 ganglioside. Reexamination of her cultured fibroblasts revealed a severe deficiency in neuraminidase activity using neuramin lactose, fetuin and 2-(3′-methoxyphenyl)-N-acetyl-D-neuraminic acid as substrates, but normal neuraminidase activity using G M3 ganglioside as a substrate. The presence of normal levels of β-galactosidase activity in leukocytes from the mother of the patient indicates that the β-galactosidase deficiency is not the primary enzyme defect in this type of patient.
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