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Structure-independent nucleotide sequence analysis.

D R Mills, F R Kramer

    Proceedings of the National Academy of Sciences of the United States of America
    |May 1, 1979
    PubMed
    Summary
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    Substituting inosine for guanosine in nucleic acid fragments prevents secondary structures during electrophoresis. This improves fragment mobility, enhancing resolution in both DNA and RNA sequencing.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Genetics

    Background:

    • Electrophoretic analysis of nucleic acids can be hindered by secondary structure formation.
    • Secondary structures affect fragment mobility, complicating accurate sequencing.
    • Current sequencing methods require strategies to mitigate these structural artifacts.

    Purpose of the Study:

    • To investigate the effect of substituting inosine for guanosine in nucleic acid fragments.
    • To determine if this substitution prevents secondary structure formation during electrophoresis.
    • To assess the impact on fragment mobility and overall sequencing resolution.

    Main Methods:

    • Synthesis of RNA and DNA fragments with inosine substitution for guanosine.
    • Electrophoretic analysis of synthesized nucleic acid fragments.

    Related Experiment Videos

  • Comparison of mobility patterns between modified and unmodified fragments.

    • Main Results:

    • Inosine substitution effectively prevented secondary structure formation in analyzed fragments.
    • Fragment mobility became a direct function of molecular weight.
    • Improved resolution was observed in sequencing gels.

    Conclusions:

    • Inosine substitution is a viable strategy to enhance nucleic acid sequencing.
    • This method offers improved resolution for both RNA and DNA sequencing.
    • The prevention of secondary structures simplifies electrophoretic analysis and data interpretation.