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Probing single DNA mobility with fluorescence correlation microscopy.

Svetlana A Tatarkova1, David A Berk

  • 1Department of Physics, University of Durham, Durham DH1 3LE, United Kingdom. s.a.tatarkova@durham.ac.uk

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 21, 2005
PubMed
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Fluorescence correlation spectroscopy reveals how DNA fragment mobility is affected by length and diffusion through gels. Longer DNA fragments experience hindered diffusion, aligning with polymer physics theories.

Area of Science:

  • Biophysics
  • Physical Chemistry
  • Molecular Biology

Background:

  • Studying DNA fragment mobility is crucial for understanding biological processes and developing new technologies.
  • Single-molecule techniques offer high resolution for investigating complex biological systems.

Purpose of the Study:

  • To investigate the mobility and diffusion dynamics of DNA fragments in aqueous solutions and tissue models.
  • To analyze the relationship between DNA length and its hydrodynamic radius and diffusion behavior.
  • To explore the hindered diffusion of DNA through gel matrices and compare it with polymer physics models.

Main Methods:

  • Utilizing fluorescence correlation spectroscopy combined with microscopy (FCSM) for single-molecule analysis.
  • Measuring the effective hydrodynamic radius of various double-stranded DNA (ds-DNA) chain lengths.

Related Experiment Videos

  • Modeling the hindered diffusion of ds-DNA through gel matrices as an extension of Kramer's problem.

    • Main Results:

    • The effective hydrodynamic radius of ds-DNA fragments showed a clear dependence on DNA length, following a theoretical relationship.
    • Hindered diffusion through gel matrices was observed, with the average barrier crossing time increasing significantly with DNA length.
    • Observed diffusion behaviors align with theoretical predictions for polymer chains navigating entropic barriers.

    Conclusions:

    • FCSM is a powerful tool for characterizing DNA fragment dynamics at the single-molecule level.
    • DNA fragment mobility and diffusion are strongly influenced by molecular length and the surrounding environment.
    • The study provides experimental validation for theoretical models of polymer diffusion in complex media.