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There are considerable interindividual variations in drug absorption, distribution, metabolism and excretion (ADME) in humans, which may lead to undesired drug effects in pharmacotherapy. Some of the mechanistic causes are known, e.g., genetic polymorphism, inhibition and induction of ADME enzymes and transporters, while others such as posttranscriptional regulation of ADME genes are under active...
All cells of a given organism contain nearly identical genetic information, yet tissues display unique gene expression profiles. This specificity is in part due to transcriptional control by epigenetic mechanisms that involve post-translational modifications of histones. These modifications affect the folding of the chromatin fiber and serve as binding sites for non-histone chromosomal proteins. Here...
DNA methylation is an epigenetic phenomenon known to play an increasingly important role in the etiology of cancer. Changes in DNA methylation patterns particularly in the promoter region of genes either in the form of hypomethylation or hypermethylation can have profound effects on gene expression. Hypermethylation in the promoter region of genes is involved in down regulation of the gene expression...
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