These findings support the hypothesis that this family of methyl-specific DNases evolved as mobile elements competing with specific genome methylation systems through host killing.
Because ERK is known to affect gene methylation directly for epigenetic alteration, the methylation status following the treatment with rVvpE was determined by means of methyl-specific PCR.
In addition, in conjunction with the co-suppression of methyl-specific proteins (MECP1/2), miR-302 resulted in global genomic DNA demethylation and histone H3 lysine 4(H3K4) modification [68].
This limits detection of methyl-specific priming (MSP) to 10 simultaneous performed reactions Sanders et al., 2012 and less than 5 for MethyLight™, respectively Fackler et al., 2014, Olkhov-Mitsel et al., 2014.
Methylation status of the CpG islands was assessed using quantitative methyl specific PCR (MSP) of bisulfite treated genomic DNA isolated from dissected CA3 tissue.
Basically, the assay relies on differential cleavage of target sequences by two different restriction endonucleases - methyl specific (MS) and methyl dependent (MD), whose activity require either the presence or absence of methylated cytosines respectively in their recognition sequences.
Bisulfite-treated genomic DNA was used for further analysis of methylation status of CpG sites via methyl-specific PCR (MSP) and bisulfite DNA sequencing.
DNAs with epigenetic methylation, by a methyltransferase linked or unlinked with a restriction enzyme, can also be the target of DNases, such as McrBC of Escherichia coli, which was discovered because of its methyl-specific restriction.
In the following years, numerous additional histone demethylases, that execute the removal of methyl groups on specific lysine residues of the histone tails and of non-histone substrates, were characterized in more detail (reviewed in ref. 2).
The addition of methyl groups to specific sequences within the DNA, for example, acts as an epigenetic signal to reduce the transcription, and thus expression, of the genes concerned.
Demethylases containing the JmjC domain can catalyze the removal of all methylation marks (Huang et al., 2006; Tsukada et al., 2006), but different classes of JmjC proteins are only capable of removing a subset of methyl marks from specific lysine residues in vivo (Allis et al., 2007).
