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HLA-DQA1 typing in Danes by two polymerase chain reaction (PCR) based methods
J B Cowland1, H O Madsen, N Morling
1Department of Forensic Genetics, University of Copenhagen, Denmark.
Forensic Science International
|May 9, 1995
Summary
Two polymerase chain reaction (PCR) methods were used for human leukocyte antigen DQA1 (HLA-DQA1) typing. Both methods showed high power of discrimination for identity and paternity testing in Danish individuals.
Area of Science:
- Immunogenetics
- Molecular Biology
Background:
- Human Leukocyte Antigen (HLA) genes play a crucial role in immune response.
- Accurate HLA-DQA1 typing is essential for various forensic and clinical applications.
Purpose of the Study:
- To evaluate and compare two distinct PCR-based methods for HLA-DQA1 typing.
- To assess the discriminatory power of these methods for identity and paternity testing.
Main Methods:
- Utilized two polymerase chain reaction (PCR) based methods: reverse dot-blot (RDB) and a combination of PCR-restriction fragment length polymorphism (PCR-RFLP) with allele-specific amplification (ASA).
- Typed 280 individuals for HLA-DQA1 alleles.
- Analyzed allele frequencies and Hardy-Weinberg equilibrium in 146 unrelated Danish individuals.
Main Results:
- The RDB method differentiated six HLA-DQA1 alleles, while the combined PCR-RFLP/ASA method recognized eight alleles.
- HLA-DQA1 alleles were in Hardy-Weinberg equilibrium in the Danish population sample.
- The power of discrimination (PD) for identity testing was high, reaching 0.932 (RDB) and 0.942 (PCR-RFLP/ASA).
- Theoretical chance of exclusion for non-fathers in paternity testing was substantial: 0.634 (RDB) and 0.660 (PCR-RFLP/ASA).
Conclusions:
- Both PCR-based HLA-DQA1 typing methods are effective and provide high discriminatory power.
- These methods are suitable for forensic applications like identity and paternity testing.
- The PCR-RFLP/ASA method offers a slightly higher allele recognition and discriminatory capacity compared to RDB.