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Estimating the total mouse DNA methylation according to the B1 repetitive elements
1Functional Genomics Lab, CHA Research Institute, Bundang Campus, College of Medicine, Pochon CHA University, 222 Yatap-Dong, Bundang-Gu, Sungnam-Si, Kyunggi-Do, 463-836, Republic of Korea.
Biochemical and Biophysical Research Communications
|August 24, 2005
Summary
Global DNA methylation in mice can be measured using the B1 repetitive element. This method accurately tracks changes in methylation, even in response to DNA methylation inhibitors like 5-azacytidine.
Area of Science:
- Epigenetics
- Genomics
- Molecular Biology
Background:
- The B1 repetitive element is abundant in the mouse genome, with approximately 30,000 copies.
- Each B1 element contains six CpG dinucleotides, which are partially methylated.
- Assessing global DNA methylation is crucial for understanding various biological processes and diseases.
Purpose of the Study:
- To establish a method for measuring global DNA methylation status in mice using the B1 repetitive element.
- To validate the method's sensitivity to changes induced by DNA methylation inhibitors.
Main Methods:
- Quantitative analysis of DNA methylation in B1 repetitive elements was performed using methylation-specific PCR (MSP) and pyrosequencing.
- The response of B1 element CpG methylation to the DNA methylation inhibitor 5-azacytidine (5-AzaC) was evaluated in NIH3T3 cells.
Main Results:
- Both pyrosequencing and MSP indicated an average CpG methylation of 9% in the mouse genome.
- A linear correlation was observed between the relative CpG methylation percentage of the B1 element and increasing concentrations of 5-AzaC (up to 50 ng/ml).
- The assays demonstrated high reproducibility, with a standard deviation of only 1.73% across three independent experiments.
Conclusions:
- Measuring B1 element methylation provides a reliable proxy for global DNA methylation status in mice.
- This method is sensitive to alterations in DNA methylation, as demonstrated by its response to 5-azacytidine treatment.
- The developed technique offers a less labor-intensive approach for routine analysis of global DNA methylation changes in pharmaceutical and epigenetic research, applicable both in vivo and in vitro.