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Related Experiment Videos

High-resolution HLA typing for the DRB3/4/5 genes by sequence-based typing

C E Voorter1, D de Bruyn-Geraets, E M van den Berg-Loonen

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

Tissue Antigens
|October 23, 1997
PubMed
Summary

Sequence-based typing effectively identifies Human Leukocyte Antigen (HLA) DRB3, DRB4, and DRB5 subtypes. This method offers superior accuracy for detecting diverse alleles, including novel ones, compared to previous techniques.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Human Leukocyte Antigen (HLA) Typing

Background:

  • High polymorphism in Human Leukocyte Antigen (HLA) genes necessitates advanced typing strategies.
  • Existing sequence-based typing methods are established for DRB1, DQB1, and DPB1 alleles.
  • DRB3, DRB4, and DRB5 genes exhibit allelic variability extending beyond exon 2, requiring analysis of additional exons for comprehensive subtyping.

Purpose of the Study:

  • To develop and validate a sequence-based typing protocol for Human Leukocyte Antigen (HLA) DRB3, DRB4, and DRB5 subtypes.
  • To assess the efficiency and accuracy of sequence-based typing for these associated HLA genes.
  • To identify novel alleles within the DRB3, DRB4, and DRB5 gene families.

Main Methods:

  • Design of specific oligonucleotide primers for amplifying key exons (including exon 2, 3, and 4) of DRB3, DRB4, and DRB5 genes.

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  • Development of a protocol for simultaneous detection of alleles in heterozygous combinations.
  • DNA sequencing of amplified exons for precise allele identification and subtyping in 238 individuals.

    • Main Results:

    • The developed protocol successfully subtyped 238 individuals for DRB3, DRB4, and DRB5 alleles, showing concordance with previous PCR-SSP typing.
    • Identification of known alleles including DRB3 (*0101, *0201, *0202, *0301), DRB4 (*01011, *0102, *0103), and DRB5 (*0101, *0102, *0103, *0105, *0201, *0202, *0203).
    • Discovery of two new alleles: DRB4*0105 and DRB3*0207. DRB5*0201 was identified as a sequencing error, identical to DRB5*0202.

    Conclusions:

    • Sequence-based typing is a superior method for detecting Human Leukocyte Antigen (HLA) DRB3, DRB4, and DRB5 subtypes.
    • The developed protocol enables accurate and comprehensive subtyping, including the identification of novel alleles.
    • This method enhances the capabilities of HLA typing, particularly for complex polymorphic gene regions.