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Achieving single nucleotide sensitivity in direct hybridization genome imaging.

Yanbo Wang1, W Taylor Cottle1, Haobo Wang2

  • 1Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.

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We developed single-nucleotide resolution imaging to visualize point mutations in situ. This method, sgGOLDFISH, differentiates wild-type and mutant DNA sequences, aiding genetic disease research.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Direct visualization of point mutations in situ is crucial for understanding genetic diseases and nuclear biology.
  • Existing methods may lack the sensitivity to differentiate single base pair differences.
  • Accurate detection of point mutations is essential for various biological and medical applications.

Purpose of the Study:

  • To describe a novel direct hybridization genome imaging method with single-nucleotide sensitivity.
  • To enable the visualization and differentiation of wild-type and mutant DNA sequences in situ.
  • To apply this method for identifying specific genetic modifications in cellular populations.

Main Methods:

  • Developed single guide genome oligopaint via local denaturation fluorescence in situ hybridization (sgGOLDFISH).
  • Leveraged the eSpCas9(1.1) variant and a specifically designed guide RNA for targeted DNA cleavage.
  • Utilized local denaturation and probe binding to differentiate sequences based on Cas9 cleavage efficiency.

Main Results:

  • sgGOLDFISH demonstrated single-nucleotide sensitivity, differentiating wild-type and mutant sequences with a single base pair difference.
  • Successfully identified base-editor-modified and unmodified progeroid fibroblasts from a mixed population.
  • Validated findings using progerin immunofluorescence and showed accurate sub-nuclear localization of point mutations.

Conclusions:

  • sgGOLDFISH provides a powerful tool for direct visualization and differentiation of point mutations in situ.
  • The method offers high sensitivity and specificity for genomic analysis at the single-nucleotide level.
  • This technique has significant potential for applications in genetic disease research and diagnostics.