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Serology versus PCR-SSP in typing for HLA-DR and HLA-DQ: a practical evaluation
H G Otten1, M G Tilanus, M Barnstijn
1Department of Immunohematology, University Hospital Utrecht, The Netherlands.
Insights
Serological HLA typing is reliable for specific antigens in healthy individuals. However, Polymerase Chain Reaction Sequence Specific Primers (PCR-SSP) offer more accurate Human Leukocyte Antigen (HLA) typing for a broader range of alleles in both patients and healthy individuals.
Area of Science:
- Immunogenetics
- Molecular Biology
- Clinical Diagnostics
Background:
- Human Leukocyte Antigen (HLA) typing is crucial for transplantation and disease association studies.
- Traditional serological methods have limitations in resolving specific HLA alleles.
- Advancements in molecular techniques like PCR-SSP offer potential improvements in HLA typing accuracy.
Purpose of the Study:
- To compare the accuracy of serological HLA-DR and -DQ typing with PCR-SSP methods.
- To evaluate the reliability of these techniques across different HLA allele groups and in patient vs. healthy populations.
- To determine the optimal application of each HLA typing method.
Main Methods:
- Serological HLA-DR and -DQ typing.
- Polymerase Chain Reaction Sequence Specific Primers (PCR-SSP) for HLA-DR and -DQ typing.
- Sequencing-based typing (SBT) for confirmation of discrepant PCR-SSP results.
- Analysis of typing results in a cohort of 31 patients and 73 healthy individuals for HLA-DR, and 17 patients and 23 healthy individuals for HLA-DQ.
Main Results:
- Serology showed discrepancies with PCR-SSP, particularly when analyzing a wider range of HLA-DR alleles (DR1-16).
- PCR-SSP identified more specific HLA-DR and -DQ alleles accurately in both patient and healthy groups.
- Discrepancies between serology and PCR-SSP for HLA-DRB1 were confirmed by sequencing-based typing.
Conclusions:
- Serological HLA typing is reliable for limited HLA-DR (DR1-10) and HLA-DQ (DQ1-3) antigen identification in healthy individuals.
- PCR-SSP provides reliable HLA-DR (DR1-16) and HLA-DQ (DQ1-3) typing in both patients and healthy individuals, offering superior resolution.
- PCR-SSP is recommended for comprehensive HLA typing, especially when detailed allele identification is required.
Abstract:
In this study, serological HLA-DR and -DQ typing results were compared to typing results obtained with sequence-specific primers in the polymerase chain reaction (PCR-SSP). HLA-DR typing was performed on a random caucasian population consisting of 31 patients and 73 healthy individuals. Considering HLA-DR1-10, differences in typing results were found in 3 out of 73 healthy individuals and 8 out of 31 patients. When HLA-DR1-16 alleles were taken into account, differences in typing results were found in 11 out of 31 patients and 14 out of 73 healthy individuals. Typing results of PCR-SSP, different from that of serology, were all confirmed by sequencing-based typing of HLA-DRB1 alleles. HLA-DQ1-3 typings were performed on 40 individuals consisting of 17 patients and 23 healthy individuals. Differences in typing results were found in 5 out of 17 patients and 1 out of 23 healthy individuals. From the results of this study it can be concluded that serology is a reliable technique, when restricted to identification of HLA-DR1-10 and HLA-DQ1-3 antigens in healthy individuals. By PCR-SSP, however, reliable HLA-DR1-16 and -DQ1-3 typings can be obtained both in patients and healthy individuals.