A simple method to diagnose adrenoleukodystrophy using a dried blood spot on filter paper

Area of Science:

• Biochemistry
• Clinical Diagnostics
• Mass Spectrometry

Background:

• Adrenoleukodystrophy (ALD) is a rare genetic disorder.
• Accurate and accessible diagnostic methods are crucial for early intervention.

Purpose of the Study:

• To develop a simple and effective diagnostic method for ALD using dried blood spots.
• To validate the method by analyzing fatty acid profiles in ALD patients and healthy controls.

Main Methods:

• Simultaneous extraction and methylation of fatty acids from dried blood spots using HCl-methanol.
• Analysis of fatty acid methyl esters via gas chromatography-mass spectrometry (GC-MS).
• Quantification of specific fatty acid ratios (C24:0/C22:0 and C26:0/C22:0) using m/z 143 ion chromatograms.

Main Results:

• Significantly elevated ratios of tetracosanoic acid to docosanoic acid (C24:0/C22:0) and hexacosanoic acid to docosanoic acid (C26:0/C22:0) were observed in ALD patients compared to controls.
• The fatty acid composition in dried blood spots remained stable at room temperature for at least one week.
• The method demonstrated potential for reliable ALD diagnosis from dried blood samples.

Conclusions:

• The described method offers a simple, reliable, and potentially cost-effective approach for ALD diagnosis.
• The stability and mailability of dried blood spot samples make this method suitable for widespread ALD screening.
• This technique could significantly improve early detection and management of adrenoleukodystrophy.