Lab meeting 01/11/2018
DNA methylation DNA methylation is one of the most commonly occurring epigenetic events taking place in the mammalian genome. This change, though heritable, is reversible, making it a therapeutic target. Methylation pattern is determined during embryogenesis and passed over to differentiating cells and tissues. Addition of methyl group to C-5 position of cytosine residues. Most cytosine methylation occurs in the sequence context 5'CG3‘ Occurs almost exclusively at cytosines that are followed immediately by a Guanine- CpG Dinucleotide
Mechanism Methyl groups are transferred from S-adenosyl methionine in a reaction catalysed by a DNA methyl-transferases(DNMT) or methylases.
CpG Islands CpG islands (CGI) are genomic regions that contain a high concentration of CpG sites
Conversion of unmethylated cystosines to uracil using sodium bisulfite
DNA Marker U MU M UM POMC PPMOPR PPDOPR PP 300 bp 200 bp DNA Marker U MU M UM POMC PPMOPR PPDOPR PP 300 bp 200 bp A B