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Region of interest methylation analysis: a comparison of MSP with MS-HRM and direct BSP

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Abstract

The aim of this study was to compare and contrast three DNA methylation methods of a specific region of interest (ROI): methylation-specific PCR (MSP), methylation-sensitive high resolution melting (MS-HRM) and direct bisulfite sequencing (BSP). The methylation of a CpG area in the promoter region of Estrogen receptor alpha (ESR1) was evaluated by these three methods with samples and standards of different methylation percentages. MSP data were neither reproducible nor sensitive, and the assay was not specific due to non-specific binding of primers. MS-HRM was highly reproducible and a step forward into categorizing the methylation status of the samples as percent ranges. Direct BSP was the most informative method regarding methylation percentage of each CpG site. Though not perfect, it was reproducible and sensitive. We recommend the use of either method depending on the research question and target amplicon, and provided that the designed primers and expected amplicons are within recommendations. If the research question targets a limited number of CpG sites and simple yes/no results are enough, MSP may be attempted. For short amplicons that are crowded with CpG sites and of single melting domain, MS-HRM may be the method of choice though it only indicates the overall methylation percentage of the entire amplicon. Although the assay is highly reproducible, being semi-quantitative makes it of lesser interest to study ROI methylation of samples with little methylation differences. Direct BSP is a step forward as it gives information about the methylation percentage at each CpG site.

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Acknowledgements

American University of Beirut Faculty of Medicine (AUBFM) Medical Practice Plan (MPP) fund and AUBFM Core facilities.

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Authors and Affiliations

  1. Department of Pharmacology and Toxicology, Faculty of Medicine, American University of Beirut, P.O. Box 11-0236, Beirut, Lebanon

    Reem Akika, Zainab Awada, Nahed Mogharbil & Nathalie K. Zgheib

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  1. Reem Akika
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  2. Zainab Awada
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  3. Nahed Mogharbil
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  4. Nathalie K. Zgheib
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Correspondence to Nathalie K. Zgheib.

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Akika, R., Awada, Z., Mogharbil, N. et al. Region of interest methylation analysis: a comparison of MSP with MS-HRM and direct BSP. Mol Biol Rep 44, 295–305 (2017). https://doi.org/10.1007/s11033-017-4110-7

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  • DOI: https://doi.org/10.1007/s11033-017-4110-7

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