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Related Experiment Videos

Characterization of a human 'midisatellite' sequence.

Y Nakamura, C Julier, R Wolff

    Nucleic Acids Research
    |March 25, 1987
    PubMed
    Summary
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    Researchers analyzed a human genomic locus with a large hypervariable region composed of simple sequence repeats. This study reveals the complex structure and allelic variations within this significant DNA region.

    Area of Science:

    • Human genetics
    • Molecular biology
    • Genomic structure analysis

    Background:

    • Hypervariable regions in the human genome are crucial for genetic diversity.
    • Simple sequence repeats (SSRs) contribute significantly to genomic variability.
    • Understanding complex loci is key to deciphering genome function.

    Purpose of the Study:

    • To elucidate the structure and DNA sequence of a human genomic locus containing a large hypervariable region.
    • To characterize the variability observed with different restriction enzymes and probes.
    • To determine the size and repeat unit of the hypervariable region.

    Main Methods:

    • Restriction enzyme digestion and Southern blotting.
    • Pulsed-field gel electrophoresis (PFGE) for high-molecular-weight fragments.

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  • DNA sequencing to identify repeat structures.
  • Simple sequence probes for fragment detection.

    • Main Results:

    • Complex restriction fragment patterns observed, with quantitative and qualitative variations.
    • PFGE analysis with specific enzymes (NotI, SfiI) revealed at most two allelic fragments.
    • The hypervariable region spans 250-500 kilobases and consists of tandem 40-base-pair repeats.
    • Homology detected with other hypervariable regions and minisatellite DNA.

    Conclusions:

    • The complex patterns arise from a single locus with extensive allelic variation.
    • The characterized locus represents a significant hypervariable region within the human genome.
    • Findings contribute to the understanding of genomic structure and variation in simple sequence repeat regions.