Depletion and fractionation technologies in plasma proteomic analysis

Area of Science:

• Proteomics
• Biochemistry
• Analytical Chemistry

Background:

• Plasma proteomics is crucial for biomarker discovery.
• Highly abundant proteins (e.g., albumin, IgG) mask low-abundance proteins.
• Current methods require enrichment of low-abundance proteins for detailed analysis.

Purpose of the Study:

• To review traditional and current technologies for plasma protein depletion and subfractionation.
• To highlight the benefits of enriching low-abundance proteins for comprehensive analysis.
• To discuss the application of these techniques in identifying diagnostic markers and drug targets.

Main Methods:

• Protein depletion techniques to remove abundant proteins like albumin and IgG.
• Subfractionation of depleted plasma based on isoelectric point.
• Analysis of protein fractions using 2D gel electrophoresis and mass spectrometry.

Main Results:

• Depletion enriches low-abundant proteins, facilitating their study.
• Subfractionation creates discrete protein pools for detailed analysis.
• These methods improve the identification of low-abundance proteins and cleaved peptides.

Conclusions:

• Plasma protein depletion and subfractionation are essential for advancing proteomics.
• These techniques enhance the discovery of novel plasma diagnostic markers.
• Improved analytical strategies can revitalize the development of plasma-based diagnostic tests.