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Intron sequences of HLA-B*73.

C E Voorter1, W T Swelsen, E M van den Berg-Loonen

  • 1Tissue Typing Laboratory, University Hospital Maastricht, Maastricht, The Netherlands.

Tissue Antigens
|September 15, 2001
PubMed
Summary

Human Leukocyte Antigen (HLA) B*73 allele dropout during molecular typing was caused by primer mismatches in intronic regions. New primers were designed to enable correct amplification of HLA-B*7301, improving typing accuracy.

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Area of Science:

  • Immunogenetics
  • Molecular Biology

Background:

  • Molecular typing of Human Leukocyte Antigen (HLA) B alleles, including sequence-specific oligonucleotide hybridization and sequence-based typing, relies on amplifying exons 2 and 3.
  • Primers for this amplification are typically located in conserved intronic regions, but HLA-B*73 has been frequently dropped out in these procedures.

Purpose of the Study:

  • To investigate the cause of HLA-B*73 allelic dropout during molecular typing.
  • To identify sequence variations in HLA-B*7301 introns that lead to primer mismatches.

Main Methods:

  • Sequencing of introns 1, 2, and 3 of the HLA-B*7301 allele.
  • Comparative sequence analysis of HLA-B*7301 introns against other HLA-B and HLA-C alleles.
  • Design and testing of new primers for HLA-B*7301 amplification.

Main Results:

  • The HLA-B*7301 intron sequences exhibited unique features, including insertions/deletions in intron 2 similar to HLA-C alleles and a novel deletion in intron 3.
  • Mismatches were identified between the standard HLA-B amplification primers and the HLA-B*73 intron sequences, explaining the observed allelic dropout.
  • Newly designed primers targeting introns 2 and 3 successfully enabled the amplification of HLA-B*7301 exons 2 and 3.

Conclusions:

  • Sequence variations within the introns of HLA-B*7301 are responsible for the allelic dropout observed with standard molecular typing methods.
  • The development of specific primers targeting these intronic regions is crucial for accurate and complete HLA-B typing, particularly for the B*73 allele.

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