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Related Experiment Videos

Human fetal globin DNA sequences suggest novel conversion event.

C J Stoeckert, F S Collins, S M Weissman

    Nucleic Acids Research
    |June 11, 1984
    PubMed
    Summary

    Gene conversion events involving human gamma globin alleles reveal new sequences in the A gamma globin gene. These differences, clustered in intron 2, suggest a novel gene conversion mechanism initiated by a purine-pyrimidine tract.

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    Area of Science:

    • Genetics
    • Molecular Biology
    • Human Globin Gene Expression

    Background:

    • Human gamma globin genes (G gamma and A gamma) play crucial roles in erythropoiesis.
    • Allelic variations in globin genes can impact gene expression and are of interest in genetic studies.

    Purpose of the Study:

    • To investigate the molecular basis of sequence differences in human A gamma globin alleles.
    • To elucidate the mechanism of gene conversion in the human gamma globin gene locus.

    Main Methods:

    • DNA sequencing of two cloned human A gamma globin alleles.
    • Analysis of base differences, particularly in the large intron (IVS-2).
    • S1-nuclease assay to assess DNA characteristics in supercoiled plasmids.

    Main Results:

    • Identified base differences clustered in the IVS-2 of A gamma globin alleles.
    • One allele presented a novel IVS-2 sequence.
    • Allelic differences were largely explained by gene conversion from G gamma, with interspersed G gamma-like regions in A gamma.
    • An alternating purine-pyrimidine tract was identified as a potential initiation site for gene conversion.

    Conclusions:

    • A novel gene conversion event involving human gamma globin alleles has been characterized.
    • The findings suggest a specific mechanism for gene conversion initiation mediated by poly (purine-pyrimidine) tracts.
    • This study provides insights into the dynamic nature of globin gene evolution and variation.

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