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DNA combing on low-pressure oxygen plasma modified polysilsesquioxane substrates for single-molecule studies
K K Sriram, Chun-Ling Chang1, U Rajesh Kumar
1Institute of Physics , Academia Sinica, Taipei 11529, Taiwan.
Biomicrofluidics
|October 22, 2014
Summary
This study presents a novel one-step method for stretching and immobilizing single DNA molecules using oxygen plasma-treated polymers. This approach simplifies DNA analysis in microfluidic devices without requiring molecular functionalization.
Area of Science:
- Biophysics
- Materials Science
- Nanotechnology
Background:
- Molecular combing and flow-induced stretching are standard techniques for DNA manipulation.
- These methods typically require complex surface and molecule functionalization steps.
- Microfluidics offers advantages like buffer exchange and external force manipulation for single-molecule studies.
Purpose of the Study:
- To develop a simplified, one-step method for immobilizing and stretching single DNA molecules.
- To leverage microfluidics for enhanced DNA analysis without molecular functionalization.
- To investigate the surface properties of modified polymers for DNA immobilization.
Main Methods:
- Utilized low-pressure oxygen (O2) plasma treatment on polysilsilsesquioxane (PSQ) polymer layers.
- Employed atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM) to characterize surface properties.
- Demonstrated the platform's utility with wide-field fluorescence imaging for observing biological processes and drug effects.
Main Results:
- Achieved room-temperature microfluidic device bonding and single DNA molecule stretching in a single step.
- Identified increased surface roughness and surface potential on low-pressure O2 plasma treated PSQ as key for DNA immobilization.
- Successfully visualized DNA-RNA polymerase complexes and cisplatin-induced DNA condensation.
Conclusions:
- Developed an efficient, one-step DNA immobilization and stretching technique using O2 plasma-treated PSQ.
- The modified PSQ surface properties facilitate robust DNA handling in microfluidic devices.
- The platform enables advanced single-molecule studies, including biological interactions and drug-induced DNA changes.
