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Herpes simplex virus (HSV) is a human pathogen that causes different pathologic manifestations. Rapid and feasible detection and discrimination methods for HSV genotyping is a challenge in clinical laboratories, especially in children suffering from herpetic encephalitis. A quantitative real-time polymerase chain reaction (PCR)-based genotyping assay using SYBR Green I was established. We designed only 1 pair of primer for HSV 1 and 2, targeting thymidine kinase gene conserved region. HSV genotypes were determined by PCR using melting curve analysis with LightCycler®. Different HSV genotypes were successfully detected in all clinical samples. The melting temperature for HSV 1 and 2 was 85.5±0.78°C and 89±0.53°C, respectively. These 2 genotypes were completely distinguished by means of the accurate melting assay. Importantly, detection was reliably performed within only 1 hour. The assay had no cross-reactivity across species, an excellent dynamic range from 10 to 106 copies per reaction, a good intra-assay and interassay reproducibility, and a detection limit of a single copy per reaction. Our homebrew designed and validated quantitative real-time PCR followed by a melting curve analysis provided a rapid and convenient screening test for differential identification of HSV genotypes 1 and 2. We recommend the large-scale application of this method for HSV 1 and 2 detection.
Applied Immunohistochemistry & Molecular Morphology – Wolters Kluwer Health
Published: Feb 1, 2017
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