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A new hypervariable marker for the human alpha-globin gene cluster.

A P Jarman1, D R Higgs

  • 1University of Oxford, John Radcliffe Hospital, Nuffield Department of Clinical Medicine, Headington, England.

American Journal of Human Genetics
|September 1, 1988
PubMed
Summary
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Researchers discovered a highly polymorphic DNA region near human alpha-globin genes. This minisatellite sequence, the alpha-globin 5' hypervariable region (5'HVR), acts as a valuable genetic marker on chromosome 16.

Area of Science:

  • Genetics
  • Molecular Biology
  • Human Genomics

Background:

  • The human alpha-globin gene cluster plays a critical role in oxygen transport.
  • Understanding regulatory regions upstream of globin genes is crucial for deciphering gene expression.
  • Minisatellite sequences are known for their variability and potential roles in gene regulation.

Purpose of the Study:

  • To identify and characterize novel polymorphic DNA regions near the human alpha-globin genes.
  • To investigate the nature of the minisatellite element responsible for the observed polymorphism.
  • To assess the utility of this new region as a genetic marker.

Main Methods:

  • DNA sequencing to identify the polymorphic region.
  • Minisatellite analysis to characterize the repeat structure.

Related Experiment Videos

  • Polymorphism analysis to determine variability.
  • Chromosomal localization studies.

    • Main Results:

    • A highly polymorphic minisatellite sequence, termed the alpha-globin 5' hypervariable region (5'HVR), was identified approximately 100 kb upstream of the alpha-globin genes.
    • The 5'HVR consists of a variable copy number tandem repeat array of a G/C-rich 57-bp sequence.
    • This finding brings the total number of minisatellite elements near the alpha-globin genes to five, sharing sequence identity.
    • The 5'HVR was localized to the short arm of chromosome 16.

    Conclusions:

    • The alpha-globin 5' hypervariable region (5'HVR) is a novel, highly polymorphic minisatellite locus.
    • The 5'HVR, along with other hypervariable regions at this locus, represents a valuable genetic marker for chromosome 16.
    • The presence of multiple homologous minisatellites raises questions about their distribution and evolutionary origins.