Spinning Disk Platform for Microfluidic Digital Polymerase Chain Reaction
University of Utah, Rm 5R441, 1795 E South Campus Dr., Salt Lake City, Utah 84112, USA. Analytical Chemistry
(Impact Factor: 5.64).
02/2010; 82(4):1546-50. DOI: 10.1021/ac902398c
An inexpensive plastic disk disposable was designed for digital polymerase chain reaction (PCR) applications with a microfluidic architecture that passively compartmentalizes a sample into 1000 nanoliter-sized wells by centrifugation. Well volumes of 33 nL were attained with a 16% volume coefficient of variation (CV). A rapid air thermocycler with aggregate real-time fluorescence detection was used, achieving PCR cycle times of 33 s and 94% PCR efficiency, with a melting curve to validate product specificity. A CCD camera acquired a fluorescent image of the disk following PCR, and the well intensity frequency distribution and Poisson distribution statistics were used to count the positive wells on the disk to determine the number of template molecules amplified. A 300 bp plasmid DNA product was amplified within the disk and analyzed in 50 min with 58-1000 wells containing plasmid template. Target concentrations measured by the spinning disk platform were 3 times less than that predicted by absorbance measurements. The spinning disk platform reduces disposable cost, instrument complexity, and thermocycling time compared to other current digital PCR platforms.
Available from: Mojtaba Hasani
- "Implementing thin polymeric discs enable the researchers to design PCR systems with high temperature ramping rates. Various polymers such as polycarbonate (PC) , Poly methyl methacrylate (PMMA) , and Cyclic Olefin Copolymer (COP)  have been utilized for fabrication of such discs using different micro-fabrication technologies such as CNC milling and soft lithography. "
- "Die kommerziellen Plattformen werden durch die entsprechenden Firmen vermarktet. Alle anderen sind Forschungsplattformen der Forschergruppen Rödiger , Shen , Sundberg  und Morrison . "
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ABSTRACT: [Article in German] The need for new highly sensitive, cost-efficient, fast and robust nucleic acid detection and quantification technologies is a driving force. PCR, especially quantitative PCR (qPCR), is the method of choice in diagnostics and life-sciences. The digital PCR (dPCR) provides a new technology to measure absolute quantities of nucleic acids without the need for calibration curves. This review gives details on the dPCR technology and available platforms. We discuss the platform differences, common features as well as their advantages and disadvantages.
Available from: Justin Hardick
- "Therefore, the utility of U-dHRM in diagnostic and research applications will be improved by future work to increase the number and reduce the volumes of digital reactions, leading to improved resolution in the presence of contaminants, higher content, higher throughput and reduced reagent costs. High-throughput microfluidic digital droplet technologies (8,43–46) that incorporate simultaneous highly controlled heating and sensitive fluorescence detection for millions of reactions are needed. In a real heterogeneous sample where unknown sequences are expected and starting concentrations of targets may be unknown, millions of broad-based U-dHRM reactions will ensure enough dynamic range for successful single molecule detections (Table 3). "
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ABSTRACT: Comprehensive profiling of nucleic acids in genetically heterogeneous samples is important for clinical and basic research applications. Universal digital high-resolution melt (U-dHRM) is a new approach to broad-based PCR diagnostics and profiling technologies that can overcome issues of poor sensitivity due to contaminating nucleic acids and poor specificity due to primer or probe hybridization inaccuracies for single nucleotide variations. The U-dHRM approach uses broad-based primers or ligated adapter sequences to universally amplify all nucleic acid molecules in a heterogeneous sample, which have been partitioned, as in digital PCR. Extensive assay optimization enables direct sequence identification by algorithm-based matching of melt curve shape and Tm to a database of known sequence-specific melt curves. We show that single-molecule detection and single nucleotide sensitivity is possible. The feasibility and utility of U-dHRM is demonstrated through detection of bacteria associated with polymicrobial blood infection and microRNAs (miRNAs) associated with host response to infection. U-dHRM using broad-based 16S rRNA gene primers demonstrates universal single cell detection of bacterial pathogens, even in the presence of larger amounts of contaminating bacteria; U-dHRM using universally adapted Lethal-7 miRNAs in a heterogeneous mixture showcases the single copy sensitivity and single nucleotide specificity of this approach.
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