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Efficient random subcloning of DNA sheared in a recirculating point-sink flow system
P J Oefner1, S P Hunicke-Smith, L Chiang
1Department of Biochemistry, Stanford University, CA, USA. oefner@genome.stanford.edu
Nucleic Acids Research
|October 15, 1996
Summary
Researchers developed a novel device using a high-performance liquid chromatographic pump to fragment DNA. This method efficiently produces DNA fragments around 300 base pairs, suitable for direct cloning with random distribution.
Area of Science:
- Molecular Biology
- Biotechnology
- Biochemistry
Background:
- DNA fragmentation is crucial for molecular biology applications like cloning and sequencing.
- Traditional methods like restriction digests can be time-consuming and may introduce biases.
- Developing efficient and precise DNA fragmentation techniques is an ongoing area of research.
Purpose of the Study:
- To develop a novel, high-throughput method for DNA fragmentation.
- To achieve precise DNA size fractionation using hydrodynamic forces.
- To evaluate the suitability of the generated fragments for direct cloning.
Main Methods:
- A device was constructed utilizing a high-performance liquid chromatographic pump.
- DNA was recirculated through a 63-microm orifice, inducing fragmentation via shear stress.
- Fragment size distribution and molecular weight dependency were analyzed.
Main Results:
- The device achieved DNA fragmentation down to approximately 300 base pairs.
- Over 90% of fragments fell within a 2-fold size distribution after 30 passages.
- Fragment shearing rate was inversely proportional to molecular weight (1.0 power).
- Up to 40% of fragments were directly cloneable, with minimal improvement from end-repair enzymes.
Conclusions:
- The developed device offers an efficient method for DNA size fractionation.
- Hydrodynamic shearing provides a reproducible way to generate DNA fragments for cloning.
- This technique presents a viable alternative to traditional DNA digestion methods.