Abstract
Rapid, sensitive, and low-cost pathogen diagnostic systems are needed for early disease diagnosis and treatment, especially in resource-limited settings. This study reports a low-cost charge-coupled device (CCD)-based fluorescence imaging system for rapid detection of waterborne pathogens by isothermal gene amplification in disposable microchips. Fluorescence imaging capability of this monochromatic CCD camera is evaluated by optimizing the gain, offset, and exposure time. This imaging system is validated for 12 virulence genes of major waterborne pathogens on cyclic olefin polymer (COP) microchips, using SYTO-82 dye and real time fluorescence loop-mediated isothermal amplification referred here as microRTf-LAMP. Signal-to-noise ratio (SNR) and threshold time (Tt) of microRTf-LAMP assays are compared with those from a commercial real-time polymerase chain reaction (PCR) instrument. Applying a CCD exposure of 5 s to 105 starting DNA copies of microRTf-LAMP assays increases the SNR by 8-fold and reduces the Tt by 9.8 min in comparison to a commercial real-time PCR instrument. Additionally, single copy level sensitivity for Campylobacter jejuni 0414 gene is obtained for microRTf-LAMP with a Tt of 19 min, which is half the time of the commercial real-time PCR instrument. Due to the control over the exposure time and the wide field imaging capability of CCD, this low-cost fluorescence imaging system has the potential for rapid and parallel detection of pathogenic microorganisms in high throughput microfluidic chips.
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Acknowledgements
This research has been partially supported by grants from the US Environmental Protection Agency (Grant Number: RD83301001 and EPD10016) and Michigan Economic Development Corporation (Grant Number: 06–1-P1–0557). We thank Tiffany M. Stedtfeld for helping with reagent preparation. We are grateful to Dr. Alison M. Cupples (Department of Civil and Environmental Engineering, Michigan State University) for allowing us to use real-time PCR instrument (Chromo4TM) in her lab.
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Ahmad, F., Seyrig, G., Tourlousse, D.M. et al. A CCD-based fluorescence imaging system for real-time loop-mediated isothermal amplification-based rapid and sensitive detection of waterborne pathogens on microchips. Biomed Microdevices 13, 929–937 (2011). https://doi.org/10.1007/s10544-011-9562-2
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DOI: https://doi.org/10.1007/s10544-011-9562-2