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DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...
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Methylated DNA Immunoprecipitation
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A refined DNA methylation detection method using MspJI coupled quantitative PCR.

Christopher J Petell1, Gilbert Loiseau2, Ryan Gandy1

  • 1Department of Biochemistry, Purdue University, West Lafayette, IN 47907, United States.

Analytical Biochemistry
|June 19, 2017
PubMed
Summary
This summary is machine-generated.

This study refines DNA methylation detection using MspJI-coupled MD-qPCR, enhancing accuracy and sensitivity for epigenetic analysis. The method precisely measures DNA methylation gains, proving valuable for diagnostic applications.

Keywords:
DNA methylationHpaIIMD-qPCRMspJIPluripotency gene enhancersRestriction enzymes

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genomics

Background:

  • DNA methylation is a crucial epigenetic modification regulating gene expression and cellular processes.
  • Methylation-dependent quantitative PCR (MD-qPCR) is used to measure DNA methylation at specific sites.
  • Existing methods have limitations in sensitivity and accuracy for detecting methylation changes.

Purpose of the Study:

  • To refine the MD-qPCR method for accurate detection of DNA methylation gains or losses.
  • To compare the efficacy of MspJI and HpaII enzymes in MD-qPCR for detecting methylation changes.
  • To assess the potential of the refined method as a diagnostic tool for epigenetic alterations.

Main Methods:

  • Developed a refined MD-qPCR technique utilizing MspJI or HpaII restriction enzymes.
  • Tested the method with varying DNA methylation concentrations (0-100%).
  • Applied the MspJI-coupled MD-qPCR to analyze DNA methylation at Sall4 and Oct4 enhancers during ESC differentiation.

Main Results:

  • MspJI demonstrated higher sensitivity and accuracy than HpaII in detecting relative DNA methylation gains via MD-qPCR.
  • The MspJI-coupled MD-qPCR accurately quantified methylation gain at the Sall4 enhancer.
  • The method showed increased sensitivity in detecting methylation gains at the Oct4 proximal enhancer during ESC differentiation compared to HpaII.

Conclusions:

  • The MspJI-coupled MD-qPCR is a highly specific and sensitive method for detecting DNA methylation gains.
  • This refined technique improves upon existing MD-qPCR approaches.
  • The method holds significant potential as a diagnostic tool for identifying subtle DNA methylation changes in limited samples.