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Sequence-based typing provides a new look at HLA-C diversity

S Turner1, M E Ellexson, H D Hickman

  • 1Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City 73190, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|August 1, 1998
PubMed
Summary

High-resolution DNA sequencing reveals extensive human leukocyte antigen (HLA)-C polymorphism, previously underestimated due to serologic limitations. This finding suggests HLA-C evolution is driven by antigenic stress, similar to HLA-A and HLA-B.

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Area of Science:

  • Immunogenetics
  • Molecular Anthropology
  • Human Leukocyte Antigen (HLA) System

Background:

  • The polymorphism of Human Leukocyte Antigen (HLA)-A and HLA-B loci is well-established, but the diversity of HLA-C has been underestimated due to limitations in serologic typing.
  • Previous typing methods lacked the resolution to fully characterize the extensive genetic variations within the HLA-C locus.

Purpose of the Study:

  • To investigate the true polymorphic nature of HLA-C molecules using advanced DNA sequencing techniques.
  • To compare the diversification patterns of HLA-C with those of HLA-A and HLA-B loci.

Main Methods:

  • DNA sequencing was employed to type 1823 samples from the National Marrow Donor Program research repository in North America.
  • HLA-C alleles were analyzed to determine their frequencies, identify novel alleles, and characterize nucleotide substitutions.

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Main Results:

  • HLA-Cw*0701 was identified as the most common allele (16% frequency), with 28% of alleles falling into serologic blank categories (Cw12-18).
  • A significant rate of new HLA-C allele discovery was observed (19 new alleles, ~1 in 100 samples), driven by nucleotide substitutions concentrated in the antigen-binding groove.
  • Homozygote frequency was 9.8%, considerably lower than reported in previous serologic or sequence-specific primer studies.

Conclusions:

  • HLA-C polymorphism is more extensive than previously believed and shares similarities with HLA-A and HLA-B, suggesting antigenic stress drives its evolution.
  • Despite similarities, conserved regions in HLA-C suggest distinct evolutionary responses to antigenic pressures compared to HLA-A and HLA-B.
  • Further DNA sequencing-based typing across diverse populations is hypothesized to reveal HLA-C polymorphism levels equal to or exceeding those of HLA-A and -B.