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Essential strategies to optimize asymmetric PCR conditions as a reliable method to generate large amount of ssDNA aptamers
Author(s) -
Heiat Mohammad,
Ranjbar Reza,
Latifi Ali Mohammad,
Rasaee Mohammad Javad,
Farnoosh Gholamreza
Publication year - 2017
Publication title -
biotechnology and applied biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.468
H-Index - 70
eISSN - 1470-8744
pISSN - 0885-4513
DOI - 10.1002/bab.1507
Subject(s) - aptamer , dna , polymerase chain reaction , annealing (glass) , chemistry , chromatography , analytical chemistry (journal) , microbiology and biotechnology , biology , materials science , biochemistry , gene , composite material
Asymmetric PCR, a simple method to generate single‐stranded DNA (ssDNA) aptamers in systematic evaluation of ligand by exponential enrichments rounds, is coupled with limitations. We investigated the essential strategies for optimization of conditions to perform a high‐quality asymmetric PCR. Final concentrations of primers and template, the number of PCR cycles, and annealing temperature were selected as optimizing variables. The qualities of visualized PCR products were analyzed by ImageJ software. The highest proportion of interested DNA than unwanted products was considered as optimum conditions. Results revealed that the best values for primers ratio, final template concentration, annealing temperature, and PCR cycles were, respectively, 30:1, 1 ng/μL, 55 °C, and 20 cycles for the first and 50:1, 2 ng/μL, 59 °C, and 20 cycles for other rounds. No significant difference was found between optimized asymmetric PCR results in the rounds of two to eight ( P > 0.05). The ssDNA quality in round 10 was significantly better than other rounds ( P < 0.05). Generally, the ssDNA product with less dimers, double‐stranded DNA (dsDNA), and smear are preferable. The dsDNA contamination is the worst, because it can act as antidote and inhibits aptameric performance. Therefore, to choose the best conditions, the lower amount of dsDNA is more important than other unwanted products.