A sequencing primer mixture is loaded into 1 reservoir of the primer cartridge and dispensed to 4 different wells. Each primer only anneals to its specific target sequence and will be elongated during the Pyrosequencing reaction. Primers in each MPD mix should be designed and checked to avoid formation of primer–dimers or binding to another PCR template.
ER-alpha methylation was measured in defined mixtures of methylated and unmethylated control DNA, representing methylation degrees of 0, 50 and 100%, using four different PyroMark platforms. The methylation measured for one CpG site was plotted against the expected percentage of methylated DNA. All four platforms gave the same results, showing that previously designed assays can be transferred among various PyroMark platforms.
The NRAS Pyro assay was used to measure mutation frequencies in defined mixtures of wildtype and mutated NRAS sequences. Nine different mixtures representing frequencies of 0, 5, 10, 25, 50, 75, 90, 95, and 100% were analyzed using three different PyroMark platforms. The mutation frequencies measured were plotted against the expected frequencies. The data reveals that all three platforms gave the same results, showing that previously designed assays can be transferred among various PyroMark platforms.
In run A, PCR products and non-template controls (NTC) were loaded into a Q48 disc in alternating order. The Pyrosequencing results show no cross-contamination between disc wells. Run B was performed with NTC samples only and without replacing the absorber strip from the first run. The results exclude any cross-contamination from one run to another. Results shown in relative light units.