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Related Experiment Videos

Sequence variation in Japanese HLA-DRw8 specificity.

Y Watanabe1, S Matsushita, T Kohsaka

  • 1Department of Immunology, National Children's Medical Research Center, Tokyo, Japan.

Human Immunology
|July 1, 1992
PubMed
Summary

Four Japanese DRw8 haplotypes were analyzed for their DRB1 gene nucleotide sequences. This research clarifies the genetic basis for DRw8 subspecificities, linking them to specific amino acid variations.

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Area of Science:

  • Human genetics
  • Immunogenetics
  • Molecular biology

Background:

  • The human leukocyte antigen (HLA) complex plays a crucial role in immune response.
  • DRw8 haplotypes are important in Japanese populations, but their DRB1 gene sequences and relation to serologic subspecificities were not fully elucidated.
  • Previous work identified the DRB1 sequence for DRw8-DQw6(w1) as DRB1*08032.

Purpose of the Study:

  • To determine the nucleotide sequences of the remaining DRw8 DRB1 alleles in the Japanese population.
  • To clarify the correspondence between these alleles and internationally recognized DRw8 subspecificities.
  • To investigate the molecular basis for the classification of DRw8 haplotypes.

Main Methods:

  • Cloning of DRB1 genes from different DRw8 haplotypes.

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  • Determination of nucleotide sequences of the cloned DRB1 genes.
  • Comparison of obtained sequences with published data and analysis of amino acid variations.

    • Main Results:

    • The nucleotide sequences of three previously uncharacterized DRw8 DRB1 alleles were determined.
    • Differences were identified at two amino acid positions, leading to the classification of the four DRw8 haplotypes into two distinct groups.
    • Group (a) includes DRw8-DQw6(w1) and DRw8-DQw7(w3) with Ser57 and Ile67, corresponding to DRB1*08032.
    • Group (b) includes DRw8-DQw4 and DRw8-DQw8(w3) with Asp57 and Phe67, corresponding to DRB1*0802.
    • This molecular classification aligns with the serologic subtyping of DRw8 into DR8.1 and DR8.2.

    Conclusions:

    • The study successfully elucidated the nucleotide sequences of Japanese DRw8 DRB1 alleles.
    • Specific amino acid residues at positions 57 and 67 are key determinants for classifying DRw8 haplotypes into two distinct molecular groups.
    • These findings provide a molecular basis for the serologic subtyping of DRw8 and contribute to a deeper understanding of HLA polymorphism in the Japanese population.