This paper reports a method for trapping circular DNA molecules and imaging the dynamics with high spatial resolution using a micropillar-array device. We successfully trapped circular bacterial artificial chromosome DNA molecules at a micropillar-based “ring toss” in the laminar flow of a microchannel under a fluorescence microscope and demonstrated the imaging of their extension by flow and condensation process induced by spermine solution. DNA molecules were visualized in an extended loop conformation, allowing high spatial resolution, and the results showed that the dynamics is induced by the microfluidic control of the surrounding chemical environment. The method is expected to lead to the elucidation of the physical characteristics and the dynamics of circular DNA molecules.
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