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Sequence variation at the human ABO locus.

S P Yip1

  • 1Department of Nursing and Health Sciences, The Hong Kong Polytechnic University, Kowloon, SAR, China.

Annals of Human Genetics
|May 17, 2002
PubMed
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The ABO blood group gene exhibits extensive sequence variation, with over 70 alleles identified. Both mutations and recombination contribute significantly to the genetic diversity of this important blood group system.

Area of Science:

  • Genetics
  • Molecular Biology
  • Transfusion Medicine

Background:

  • The ABO blood group system is crucial in transfusion medicine.
  • Recent advancements include gene cloning and DNA-based genotyping methods for the ABO gene.

Purpose of the Study:

  • To analyze the extensive sequence variation within the ABO gene.
  • To understand the molecular basis of ABO alleles and subgroups.
  • To propose a unifying nomenclature for ABO alleles.

Main Methods:

  • DNA sequencing
  • DNA-based genotyping methods (restriction analysis, allele-specific amplification, mutation screening)
  • Haplotype analysis of sequence variations

Main Results:

Related Experiment Videos

  • Extensive sequence heterogeneity found in both coding and non-coding regions of the ABO gene.
  • Over 70 ABO alleles identified, including those for major blood groups and subgroups (e.g., A2, Ax, B3).
  • Sequence variations include SNPs in UTRs and introns, and minisatellite repeats.
  • Both point mutations and intragenic recombination contribute to ABO genetic diversity.
  • Recombination sites in hybrid alleles can be precisely mapped using SNP haplotype analysis.

Conclusions:

  • Significant genetic diversity exists within the ABO locus, driven by both mutations and recombination.
  • A proposed nomenclature system aims to standardize the naming of numerous ABO alleles.
  • Understanding ABO allele variation is essential for accurate blood group genotyping and transfusion practices.