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Supercoiling DNA Locates Mismatches.

Andrew Dittmore1, Sumitabha Brahmachari2, Yasuharu Takagi1

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|October 21, 2017
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Summary

We developed a magnetic tweezers method to detect DNA sequence defects, even a single mismatched base pair. This DNA supercoiling technique reveals how defects form plectonemes, suggesting a role in cellular sensing.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • DNA sequence defects can arise from replication errors or damage.
  • Understanding how cells detect these defects is crucial for maintaining genomic integrity.
  • Existing methods for detecting sequence defects have limitations in sensitivity and throughput.

Purpose of the Study:

  • To present a novel method for detecting DNA sequence defects using magnetic tweezers.
  • To characterize the physical behavior of supercoiled DNA at sequence defects.
  • To explore the potential role of DNA supercoiling in in vivo DNA sensing.

Main Methods:

  • Utilizing magnetic tweezers to apply controlled force and torque to DNA molecules.
  • Inducing supercoiling in DNA and observing the formation and stability of plectonemes at artificial mismatches.
  • Systematically varying the number of adjacent mismatches (0-16) under specific salt and force conditions.

Main Results:

  • The method is sensitive to single base pair mismatches in long DNA sequences.
  • A single plectoneme forms and is stably pinned at DNA sequence defects.
  • Quantified the energy and kinking at defects, enabling estimation of plectoneme pinning probability.

Conclusions:

  • DNA supercoiling can lead to stable plectoneme formation at sequence defects.
  • This physical phenomenon suggests a potential mechanism for DNA mismatch and damage sensing in vivo.
  • The developed method offers a sensitive approach for studying DNA structural dynamics and defects.