Globoid leukidystrophy. I. Clinical and enzymatic studies

Area of Science:

• Biochemistry
• Genetics
• Neurology

Background:

• Globoid leukodystrophy (GLD) is a rare genetic disorder affecting myelin.
• Clinical presentations of GLD can vary, differing from the classic Krabbe disease phenotype.
• Early development in GLD patients suggests normal initial maturation and myelination.

Purpose of the Study:

• To investigate the clinical and biochemical spectrum of globoid leukodystrophy.
• To confirm the enzyme deficit in GLD and determine its mode of inheritance.
• To utilize a novel assay for cerebrosidase activity.

Main Methods:

• Clinical assessment of patients and siblings.
• Biochemical analysis of leukocyte enzyme activity using galactosyl ceramide.
• Comparison of enzyme levels in patients, parents, siblings, and controls.

Main Results:

• Identified a specific deficit in cerebrosidase activity in leukocytes of GLD patients.
• Observed intermediate levels of cerebrosidase activity in parents of GLD patients.
• Findings support a broader clinical spectrum for GLD than previously recognized.

Conclusions:

• The study confirms a specific enzyme deficiency in globoid leukodystrophy.
• Results indicate an autosomal recessive inheritance pattern for GLD.
• GLD exhibits a wider range of clinical manifestations than the classic Krabbe disease.