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Triplicated alpha-globin loci in humans.

M Goossens, A M Dozy, S H Embury

    Proceedings of the National Academy of Sciences of the United States of America
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers found a genetic variation where individuals have three alpha-globin genes, not the usual two. This triple alpha-globin gene arrangement was detected using DNA analysis and varied in frequency across different populations.

    Area of Science:

    • Molecular Biology
    • Human Genetics
    • Population Genetics

    Background:

    • The alpha-globin gene cluster plays a crucial role in hemoglobin synthesis.
    • Gene duplications and variations within globin gene clusters can impact health.
    • Understanding alpha-globin gene copy number is important for genetic studies.

    Purpose of the Study:

    • To identify and characterize individuals with an unusual number of alpha-globin genes.
    • To investigate the genetic mechanism responsible for the triple alpha-globin locus.
    • To determine the population frequency of this genetic variation.

    Main Methods:

    • Restriction endonuclease digestion of DNA.
    • Hybridization techniques using alpha-globin cDNA probes.

    Related Experiment Videos

  • Analysis of DNA fragment sizes to confirm gene locus presence and arrangement.

    • Main Results:

    • Identified 12 individuals heterozygous for a chromosome with three alpha-globin genes.
    • Confirmed the presence of the third alpha-globin locus through specific DNA digestion patterns.
    • Observed varying frequencies of triple alpha-globin loci in different ethnic groups (American blacks, Sardinians, Greek Cypriots).

    Conclusions:

    • A nonhomologous crossover mechanism likely explains the formation of triple alpha-globin loci.
    • The triple alpha-globin gene arrangement appears to be clinically and hematologically silent in individuals with five alpha-globin genes.
    • Population-specific frequencies suggest potential founder effects or selective pressures.