Abstract
A conventional method of DNA sequencing can determine up to 1000 base pairs at one time. Therefore, long DNA should be cut into many short fragments that are suitable for DNA sequencing. Those fragments, however, lose their order information. If the fragments are prepared from the terminus of the long DNA, the reorganization process can be omitted. This process consists of following unit operations; manipulation of genomic DNA, fixation with a stretched form, cutting from the terminus, recovery and amplification. In these unit operations, manipulation and cutting of DNA are focused in this report. Globular transformation suppresses break down of long genome DNA and permits manipulation of large DNA. Because globular transition is reversible, the coiled DNA can be sequentially spun from the globular DNA like a spindle. Thespun DNA was successfully fixed on a glass surface in an arbitrary pattern. To prepare fragments from the stretched DNA molecule, a method to cut DNA moleculen was developed. Since most restriction enzyme requires magnesium ion for their activation, the restriction enzyme was successfully activated only when magnesium ion was electrochemically supplied.
Keywords: DNA, globular transformation, laser trap, local reaction, manipulation, single molecule, stretching
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