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A new mass screening method for determining UDP-galactose in blood
The Tohoku Journal of Experimental Medicine
|November 1, 1983
Summary
A novel microfluorometric assay using a single blood disc enables efficient screening for UDP-galactose levels. This method aids in diagnosing galactosemia by measuring enzyme deficiencies.
Area of Science:
- Biochemistry
- Clinical Diagnostics
- Enzymology
Background:
- Galactosemia is a metabolic disorder affecting galactose metabolism.
- Accurate measurement of UDP-galactose is crucial for diagnosing galactosemia subtypes.
- Existing methods may require larger sample volumes or are less efficient for mass screening.
Purpose of the Study:
- To develop a sensitive and rapid microfluorometric assay for determining UDP-galactose.
- To validate the assay's utility in diagnosing various forms of galactosemia.
- To establish a method suitable for mass screening using minimal blood samples.
Main Methods:
- A microfluorometric assay was developed utilizing UDP-galactose-4-epimerase and UDP-glucose dehydrogenase.
- The assay measures the conversion of NAD to NADH, indicating UDP-galactose concentration.
- The method was optimized for a 3 mm blood disc, enabling microvolume analysis.
Main Results:
- The assay demonstrated reliable quantification of UDP-galactose in blood within the ranges of 0-1 mM and 0-0.2 mM.
- UDP-galactose levels were successfully determined in patients with epimerase, transferase, and kinase deficiencies.
- The method showed potential for differentiating between high and low Paigen's values, indicative of metabolic status.
Conclusions:
- The developed microfluorometric assay is a highly efficient tool for mass screening of UDP-galactose.
- This method offers a minimally invasive approach for diagnosing galactosemia and related disorders.
- The assay's sensitivity and small sample requirement make it valuable for newborn screening programs.