Electrophoretic cell manipulation and electrochemical gene-function analysis based on a yeast two-hybrid system in a microfluidic device

Tomoyuki Yasukawa, Kuniaki Nagamine, Yoshiko Horiguchi, Hitoshi Shiku, Masahiro Koide, Tomoaki Itayama, Fujio Shiraishi, Tomokazu Matsue

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43 Citations (Scopus)


A novel microfluidic device with an array of analytical chambers was developed in order to perform single-cell-based gene-function analysis. A series of analytical processes was carried out using the device, including electrophoretic manipulation of single cells and electrochemical measurement of gene function. A poly(dimethylsiloxane) microstructure with a microfluidic channel (150 μm in width, 10 μm in height) and an analytical chamber (100 x 20 x 10 μm3) were fabricated and aligned on a glass substrate with an array of Au microelectrodes. Two microelectrodes positioned in the analytical chamber were employed as a working electrode for the electrophoretic manipulation of cells and electrochemical measurements. A yeast strain (Saccharomyces cerevisiae Y190) carrying the β-galactosidase reporter gene was used to demonstrate that the device could detect the enzyme. Target cells flowing through the main channel were introduced into the chamber by electrophoresis using the ground electrode laid on the main channel. When the cell was treated with 17β-estradiol, gene expression was triggered to produce β-galactosidase, catalyzing the hydrolysis of p-aminophenyl-β- D-galactopyranoside to form p-aminophenol (PAP). The enzymatically generated PAP was detected by cyclic voltammetry and amperometry at the single-cell level in the chamber of the device. Generator-collector mode amperometry was also applied to amplify the current response originating from gene expression in the trapped single cells. After electrochemical measurement, the trapped cells were easily released from the chamber using electrophoretic force.

Original languageEnglish
Pages (from-to)3722-3727
Number of pages6
JournalAnalytical Chemistry
Issue number10
Publication statusPublished - 2008 May 15


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