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The PPARGC1A gene regulates genes involved in energy metabolism. [1] [2] Since type 2 diabetes is characterized by chronic hyperglycaemia as a result of impaired pancreatic beta cell function [3] and insulin resistance in peripheral tissues, [4] it was thought that the gene might be downregulated in type 2 diabetes patients through DNA methylation.
Type 2 diabetes is a progressive condition in which the body becomes resistant to the normal effects of insulin and/or gradually loses the capacity to produce enough insulin in the pancreas. [2] Pre-diabetes means that the blood sugar level is higher than normal but not yet high enough to be type 2 diabetes. [3]
A metabolite of benzopyrene forms an intercalated DNA adduct, at center. In molecular genetics, a DNA adduct is a segment of DNA bound to a cancer-causing chemical. This process could lead to the development of cancerous cells, or carcinogenesis. DNA adducts in scientific experiments are used as biomarkers of exposure.
The central role of DNA damage and epigenetic defects in DNA repair genes in carcinogenesis. DNA damage is considered to be the primary cause of cancer. [17] More than 60,000 new naturally-occurring instances of DNA damage arise, on average, per human cell, per day, due to endogenous cellular processes (see article DNA damage (naturally occurring)).
DNA damage appears to be the primary underlying cause of cancer. [39] [40] If DNA repair is deficient, DNA damage tends to accumulate. Such excess DNA damage can increase mutational errors during DNA replication due to error-prone translesion synthesis. Excess DNA damage can also increase epigenetic alterations due to errors during DNA repair.
The gamma-H2AX assay generally reflects the presence of double-strand breaks in DNA, though the assay may indicate other DNA damages as well. [19] Similarly, there was a 2.7-fold and 2.5-fold increase in micronuclei in lymphocytes of obese and overweight children respectively, compared to children of normal weight. [ 18 ]
The process of tumorigenesis that transforms a normal cell to a cancerous cell involve a series of complex genetic and epigenetic changes. [18] [19] [20] Identification and characterization of all these changes can be accomplished through various cancer genome sequencing strategies.
Genotoxicity is the property of chemical agents that damage the genetic information within a cell causing mutations, which may lead to cancer.While genotoxicity is often confused with mutagenicity, all mutagens are genotoxic, but some genotoxic substances are not mutagenic.