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High-resolution HLA-DRB typing using denaturing gradient gel electrophoresis and direct sequencing
L A Knapp1, E Lehmann, L Hennes
1Wisconsin Regional Primate Research Center, University of Wisconsin, Madison, USA.
Tissue Antigens
|August 1, 1997
Summary
A new method combines polymerase chain reaction (PCR), denaturing gradient gel electrophoresis (DGGE), and sequencing for precise Human Leukocyte Antigen - DRB (HLA-DRB) allele identification. This approach enhances high-resolution tissue typing and novel allele discovery.
Area of Science:
- Immunogenetics
- Molecular Biology
Background:
- High-resolution Human Leukocyte Antigen - DRB (HLA-DRB) typing is crucial for unrelated bone marrow transplantation and identifying new HLA-DRB alleles.
- Existing typing methods may offer limited information or require extensive primer/probe sets.
Purpose of the Study:
- To develop and validate a reliable, specific, and rapid method for unambiguous HLA-DRB allele identification.
- To improve high-resolution tissue typing capabilities.
Main Methods:
- Utilized polymerase chain reaction (PCR) with generic DRB-specific primers to amplify the variable second exon of HLA-DRB alleles (including HLA-DRB1, -DRB3, -DRB4, -DRB5, -DRB6, -DRB7).
- Separated amplified alleles using denaturing gradient gel electrophoresis (DGGE).
- Reamplified DNA from DGGE gel plugs for fluorescent-based sequencing and allele-assignment software analysis.
Main Results:
- Successfully identified 34 distinct HLA-DRB alleles in 17 unrelated individuals.
- The method identified HLA-DRB1 alleles missed by PCR-Sequence Specific Priming (PCR-SSP).
- Alleles from HLA-DRB3, -DRB4, and -DRB5 loci were also detected, demonstrating comprehensive typing.
Conclusions:
- The described PCR-DGGE-sequencing method provides a reliable and specific approach for identifying all HLA-DRB alleles.
- This technique offers a relatively rapid and comprehensive alternative to traditional methods for high-resolution HLA-DRB typing.