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Melt analysis of mismatch amplification mutation assays (melt-MAMA): a functional study of a cost-effective SNP genotyping assay in bacterial models.

Birdsell, Dawn N. and Pearson, Talima and Price, Erin P. and Hornstra, Heidie M. and Nera, Roxanne D. and Stone, Nathan and Gruendike, Jeffrey and Kaufman, Emily L. and Pettus, Amanda H. and Hurbon, Audriana N. and Buchhagen, Jordan L. and Harms, N. Jane and Chanturia, Gvantsa and Gyuranecz, Miklos and Wagner, David M. and Keim, Paul S (2012) Melt analysis of mismatch amplification mutation assays (melt-MAMA): a functional study of a cost-effective SNP genotyping assay in bacterial models. PLoS ONE, 7 (3). e32866. ISSN 1932-6203

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Publisher’s or external URL: http://dx.doi.org/10.1371/journal.pone.0032866


Single nucleotide polymorphisms (SNPs) are abundant in genomes of all species and biologically informative markers extensively used across broad scientific disciplines. Newly identified SNP markers are publicly available at an ever-increasing rate due to advancements in sequencing technologies. Efficient, cost-effective SNP genotyping methods to screen sample populations are in great demand in well-equipped laboratories, but also in developing world situations. Dual Probe TaqMan assays are robust but can be cost-prohibitive and require specialized equipment. The Mismatch Amplification Mutation Assay, coupled with melt analysis (Melt-MAMA), is flexible, efficient and cost-effective. However, Melt-MAMA traditionally suffers from high rates of assay design failures and knowledge gaps on assay robustness and sensitivity. In this study, we identified strategies that improved the success of Melt-MAMA. We examined the performance of 185 Melt-MAMAs across eight different pathogens using various optimization parameters. We evaluated the effects of genome size and %GC content on assay development. When used collectively, specific strategies markedly improved the rate of successful assays at the first design attempt from ~50% to ~80%. We observed that Melt-MAMA accurately genotypes across a broad DNA range (~100 ng to ~0.1 pg). Genomic size and %GC content influence the rate of successful assay design in an independent manner. Finally, we demonstrated the versatility of these assays by the creation of a duplex Melt-MAMA real-time PCR (two SNPs) and conversion to a size-based genotyping system, which uses agarose gel electrophoresis. Melt-MAMA is comparable to Dual Probe TaqMan assays in terms of design success rate and accuracy. Although sensitivity is less robust than Dual Probe TaqMan assays, Melt-MAMA is superior in terms of cost-effectiveness, speed of development and versatility. We detail the parameters most important for the successful application of Melt-MAMA, which should prove useful to the wider scientific community.

Item Type: Article
Publisher’s Statement: Creative Commons Attribution License
ID number or DOI: 10.1371/journal.pone.0032866
Related URLs:
Subjects: Q Science > QH Natural history > QH426 Genetics
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: Research Centers > Center for Microbial Genetics and Genomics
Date Deposited: 07 Oct 2015 23:28
URI: http://openknowledge.nau.edu/id/eprint/696

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