In the present study MAMAs were designed and tested to detect the nt367 and nt629 SNPs
in the obg gene of M. synoviae. The genome locations, primer sequences, annealing and melting
temperatures for these assays can be found in Tables 1 and 2. Melt-MAMA PCR reactions
were performed in 10 μl total volume, containing 1μl target DNA diluted in 2 μl 5X Color-less
GoTaq Flexi Buffer (Promega Inc., Madison, WI), 1 μl MgCl2 (25mM), 0.3 μl dNTP (10 mM,
Qiagen Inc., Valencia, CA), 0.5 μl EvaGreen (Biotium Inc., Hayward, CA), primers (10 pmol/
μl) according to Table 1 and 0.08 μl GoTaq DNA polymerase (5 U/μl; Promega). MeltMAMAs were performed on an Applied Biosystems Step-One Plus real-time PCR system with
StepOne Softwarev2.2.2. Thermocycling parameters were 95°C for 10 min, followed by 39
cycles of 95°C for 15 sec and 58°C for 1 min. Endpoint PCR products were subjected to melt
analysis using a dissociation protocol comprising 95°C for 15 sec, followed by incremental temperature ramping (0.2°C) from 58°C to 95°C. EvaGreen fluorescent intensity was measured at
525 nm at each ramp interval and plotted against temperature.