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Inverted repeated sequences in yeast nuclear DNA

H L Klein, S K Welch

    Nucleic Acids Research
    |October 24, 1980
    PubMed
    Summary

    Yeast nuclear DNA contains inverted repeated sequences, also known as foldback DNA. These sequences are clustered and enriched for repetitive DNA, suggesting a non-random genomic distribution.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Yeast Genomics

    Background:

    • Inverted repeated sequences (foldback DNA) are DNA sequences that can form hairpin structures.
    • Understanding their distribution and characteristics is crucial for comprehending genome organization and function.

    Purpose of the Study:

    • To characterize the inverted repeated sequences in yeast nuclear DNA.
    • To determine the distribution and abundance of these sequences within the yeast genome.

    Main Methods:

    • Electron microscopy to visualize DNA structures.
    • Hydroxyapatite chromatography to analyze DNA binding properties.
    • Statistical analysis to assess sequence distribution.
    • Renaturation kinetic analysis to study repetitive DNA content.

    Main Results:

    • 34% of observed structures were hairpins, 66% had single-stranded loops.
    • Average repeat length was 0.3 kb, with a single-stranded loop of 1.6 kb.
    • Approximately 250 inverted repeats per haploid genome were estimated.
    • Statistical and chromatographic analyses indicated clustered, non-random distribution of inverted repeats.
    • Foldback and stem sequences were enriched for repetitive DNA.

    Conclusions:

    • Yeast nuclear DNA contains a significant number of inverted repeats, primarily with single-stranded loops.
    • These sequences are not randomly distributed but are clustered within the genome.
    • The enrichment of repetitive DNA in these regions suggests potential roles in genome dynamics or regulation.

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