title: Rolling circle amplification and circle-to-circle amplification of a specific gene integrated with electrophoretic analysis on a single chip.
abstract: We have developed an integrated platform for rolling circle amplification (RCA) and circle-to-circle amplification (C2CA) of circular probe (padlock probe) and subsequent microchip electrophoretic detection of a specific gene on a poly(methyl methacrylate) microchip. RCA and C2CA were successfully carried out at a steady temperature of 37 degrees C in the sample well of the microchip, and their respective product was detected on the same channel of the microchip, which was prefilled with a polymer separation matrix and fluorescent dye. Using a species-specific padlock probe for bacterial pathogen V. cholerae, a 25-ng bacterial genomic DNA could be detected in less than 65 min (including RCA and microchip electrophoresis) by this platform. Stable dsDNA C2CA product of genomic DNA for V. cholerae can be detected with the introduced integrated platform. Furthermore, the usefulness of this technique for the monitoring of RCA was demonstrated. This integrated platform provides a sensitive, fast, high-throughput, and reproducible method for signal amplification and detection of the padlock probes in the same microchip and is a promising tool for highly specific gene detection strategies.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, MEXT Innovative Research Center for Preventive Medical Engineering, and Plasma Nanotechnology Research Center, Nagoya University, Japan. mahmoudian.laili@c.mbox.nagoya-u.ac.jp
authors.forename: Laili
authors.initials: L
authors.lastname: Mahmoudian
authors.forename: Noritada
authors.initials: N
authors.lastname: Kaji
authors.forename: Manabu
authors.initials: M
authors.lastname: Tokeshi
authors.forename: Mats
authors.initials: M
authors.lastname: Nilsson
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Baba
mesh_terms: D004586:Electrophoresis / Q000295:instrumentation* / Q000379:methods*; D005784:Gene Amplification / Q000235:genetics*; D006801:Humans; D056656:Lab-On-A-Chip Devices; D046208:Microchip Analytical Procedures / Q000379:methods*; D014734:Vibrio cholerae / Q000235:genetics