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      Quantitation of DNA Methylation by Quantitative Multiplex Methylation-Specific PCR (QM-MSP) Assay.

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          Abstract

          The defining feature of the Quantitative Multiplex Methylation-Specific PCR (QM-MSP) method to sensitively quantify DNA methylation is the two-step PCR approach for a multiplexed analysis of a panel of up to 12 genes in clinical samples with minimal quantities of DNA. In the first step, for up to 12 genes tested, one pair of gene-specific primers (forward and reverse) amplifies the methylated and unmethylated copies of the same gene simultaneously and in multiplex, in one PCR reaction. This methylation-independent amplification step produces amplicons of up to 109 copies per μL after 36 cycles of PCR. In the second step, the amplicons of the first reaction (STEP 1) are quantified with a standard curve using real-time PCR and two independent fluorophores to detect methylated/unmethylated DNA of each gene in the same well (e.g., 6FAM and VIC). One methylated copy is detectable in 100,000 reference gene copies. Methylation is reported on a continuous scale. For the gene panel, the highest level of normal DNA methylation above which a sample would be called positive is derived by using Receiver Operating Characteristic (ROC), maximizing assay specificity and sensitivity to distinguish between normal/benign versus tumor DNA. QM-MSP can be applied to clinical samples of fresh or fixed ductal cells, ductal fluid, nipple fluid, fine needle aspirates, core biopsies, and tumor tissue sections.

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          Author and article information

          Journal
          Methods Mol. Biol.
          Methods in molecular biology (Clifton, N.J.)
          Springer Nature America, Inc
          1940-6029
          1064-3745
          2018
          : 1708
          Affiliations
          [1 ] Breast and Ovarian Cancer Program, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, 1650 Orleans St., CRB1, RM 143, Baltimore, MD, 21321, USA.
          [2 ] Breast and Ovarian Cancer Program, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, 1650 Orleans St., CRB1, RM 143, Baltimore, MD, 21321, USA. saras@jhmi.edu.
          Article
          10.1007/978-1-4939-7481-8_24
          29224159
          15fbb0e2-ec38-419d-a5c0-c9fbc6b840fc
          History

          Bisulfite,Tissue,Quantitation,QM-MSP,Methylation-specific PCR,DNA methylation,Cells

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