Matrix-assisted Laser Desorption Ionization Mass Spectrometry for Detection of α/β-Chain Changes From Human...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Hematology

Background:

• Thalassemia diagnosis traditionally involves complex methods.
• Accurate hemoglobin chain analysis is crucial for identifying thalassemia subtypes.
• Direct analysis of whole blood for hemoglobinopathies remains a challenge.

Purpose of the Study:

• To develop a direct matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) method for analyzing human whole blood.
• To investigate the utility of alpha/beta-globin chain ratios in hemoglobin for diagnosing thalassemia.
• To assess the analytical variability of the developed method.

Main Methods:

• Directly analyzed 59 human whole blood samples using MALDI-TOF-MS with an optimized organic matrix.
• Quantified signal ratios of alpha (α) and beta (β) hemoglobin chains.
• Compared results from healthy controls, α-globin gene triplication carriers, and hemoglobin H disease patients.

Main Results:

• Successfully observed human hemoglobin (Hb) chains with high signal-to-noise directly from whole blood.
• Identified altered α/β-globin chain signal ratios in blood samples from thalassemia subtypes compared to healthy controls.
• Demonstrated analytical variability (intra-day, inter-day, inter-laboratory) for the α/β-chain signal ratios.

Conclusions:

• The developed MALDI-TOF-MS method allows direct analysis of human whole blood for hemoglobin chain assessment.
• The ratio of α/β-globin chains in hemoglobin serves as a potential indicator for investigating thalassemia.
• This approach offers a promising avenue for rapid and direct thalassemia diagnosis.