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Chemically-blocked Antibody Microarray for Multiplexed High-throughput Profiling of Specific Protein Glycosylation in Complex Samples
Published on: May 4, 2012
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Predictive modeling of complex ABO glycan phenotypes by lectin microarrays
Waseem Q Anani1,2,3, Heather E Ashwood3,4, Anna Schmidt3
1Medical Sciences Institute, Versiti, Milwaukee, WI.
Blood Advances
|August 22, 2020
Summary
A lectin microarray accurately identifies ABO blood groups and subtle variations in antigen expression missed by standard serology. This method reveals complex glycan signatures on red blood cells, aiding transfusion and transplantation decisions.
Area of Science:
- Immunology
- Biochemistry
- Genetics
Background:
- ABO blood groups are critical for transfusion safety and transplantation.
- Standard serological methods can miss subtle variations in ABH antigen expression, known as ABO subgroups.
- Lectins are proteins that bind to specific carbohydrate structures (glycans), offering a potential tool for detailed blood group analysis.
Purpose of the Study:
- To evaluate a 45-probe lectin microarray for rapid analysis of ABO blood groups and associated glycan signatures on red blood cell (RBC) surface glycoproteins.
- To compare lectin microarray results with traditional serological methods for ABO blood group classification.
- To investigate the complexity of glycan structures on RBCs related to ABO blood group expression.
Main Methods:
- Preparation of RBC membrane glycoproteins from donors representing each ABO blood group (n=20 per group).
- Analysis using a 45-probe lectin microarray to detect glycan-binding patterns.
- Confirmation of findings using principal component analysis and ABH antibody immunoblotting.
- Prediction of ABO serological phenotype using a subset of lectins.
Main Results:
- The lectin microarray successfully distinguished between ABO blood groups.
- Variations in ABH antigen expression, not detected by serology, were identified.
- Principal component analysis revealed distinct clusters based on ABO blood group and antigen expression levels.
- Subtle differences in glycoprotein density and increased glycocalyx complexity (high mannose, polylactosamine) were associated with A and B antigen expression.
Conclusions:
- Lectin microarray is a sensitive method for ABO blood group classification, detecting variations missed by routine serology.
- The technique highlights the importance of ABO antigen localization on glycoproteins and glycolipids.
- This approach may identify clinically significant ABO blood group differences relevant for transfusion and transplantation, especially in cases of malignancy or ABO-incompatible transplants.
