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Figure S1. Mean fluorescence values (normalized) of real-time potato spindle tuber viroid (PSTVd) loop-mediated isothermal amplification (LAMP) assays with ...
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Shining a light on LAMP assays—A comparison of LAMP visualization methods including the novel use of berberine Jens Fischbach, Nina Carolin Xander, Marcus Frohme, and Jörn Felix Glökler Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Wildau, Germany BioTechniques 58:189-194 (April 2015) doi 10.2144/000114275 Keywords: berberine; calcein; hydroxynaphthol blue; LAMP; loop-mediated isothermal amplification; potato spindle tuber viroid; SYBR Green I; EvaGreen

Figure S1. Mean fluorescence values (normalized) of real-time potato spindle tuber viroid (PSTVd) loop-mediated isothermal amplification (LAMP) assays with serially diluted DNA. The sensitivity of all assays was determined after incubation at 65°C for 60 min with decreasing amounts of DNA. SYBR Green I (A), EvaGreen (B), and berberine (C). All assays were monitored in an ESEquant Tube Scanner with the FAM filter (Exc.: 470 nm/ Em.: 520 nm). Template copy numbers are 1.5 × 1010 (black), 1.5 × 10 8 (blue), 1.5 × 10 6 (red), 1.5 × 10 4 (green), 1.5 × 10 2 (orange), 1.5 × 10° (magenta), and no template (gray). Detection sensitivity for each dye in the real-time LAMP assay is shown as threshold time of the fluorescence signal above 0.2 RFU (y-axis) against the log copy number of the initial template DNA (x-axis). Experiments were done in triplicate. Regression equation and coefficient of determination are shown as an insert. The data point for log 4 of SYBR Green I was not included in the regression analysis.

Vol. 58 | No. 4 | 2015

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Figure S2: Effect of berberine concentration on loop-mediated isothermal amplification (LAMP) reaction kinetics. The real-time LAMP assay (A) was carried out with 180 µM (1), 160 µM (2), 140 µM (3), 120 µM (4), 100 µM (5), 80 µM (6), 60 µM (7), and 40 µM (8) berberine by monitoring the reaction with the ESEQuant Tube Scanner (FAM filter, Exc.: 470 nm/Em.: 520 nm) for 60 min at 65°C. A template amount of 1.5 × 1010 copies was used as the positive control. All LAMP assays start amplification after 10 min, with absolute fluorescence intensity correlating with dye concentration. Insert shows a picture of the reaction tubes in UV light (312 nm). Experiments were performed in triplicate. The standard deviation and the average value of the linear slope for each berberine concentration show the effect on the reaction kinetics (B).

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