Epigenetics of diabetes Type 2


Interactions between genetics and epigenetics affect type 2 diabetes

Epigenome and diabetes

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Type 2 diabetes mellitus T2DM is a polygenic metabolic disease characterized by elevated blood sugar levels due to pancreatic beta-cell functional impairment and insulin resistance in tissues such as skeletal muscle, adipose tissue and the liver 1. Millions of people cheap clotrimazole and betamethasone dipropionate 45gm the globe are diagnosed with diabetes, and its incidence is estimated to double by It has become one of the most challenging public health issues of 21 st century and the fifth leading cause of death worldwide 2, epigenome and diabetes.

This chronic disease process is accompanied by complications in various vital organs and can be associated with a higher risk for cardiovascular events, neurological changes, epigenome and diabetes, kidney impairment, osteoporosis, cognitive impairment CI and dementia 4.

Though diabetes has a strong genetic component, as it tends to run in families, environment also has a significant role in triggering this condition. The notable risk factors for developing diabetes are obesity, advance in age, and sedentary lifestyle with lack of physical activity. However, many people with these risk factors do not epigenome and diabetes diabetes and research studies indicate that complex interaction between genes and environment through epigenetic modifications makes a person susceptible to develop diabetes 5.

Epigenetic mechanisms and their role in the development of diabetes and the significance of the environment in shaping the epigenome of an individual is presented in this article. Various epigenetic mechanisms in the regulation epigenome and diabetes gene expression This type of regulation epigenome and diabetes gene expression by the epigenetic mechanisms explains how cells with the same DNA can differentiate into different cell types with different phenotypes 5.

The notable epigenetic mechanisms that can alter gene expression are DNA methylationhistone modificationand non-coding RNA -mediated pathways Figure 1. Briefly, in DNA methylationa methyl group is added at the 5-carbon of the cytosine to form 5-methylcytosine. DNA methylation generally results in gene silencing or reduced gene expression 9.

Histones are globular proteins around which DNA coils to form nucleosomes. Epigenome and diabetes third epigenetic mechanism in regulating gene expression is micro RNAs. Genome-wide association studies GWAS of recent times are helping in detecting and identifying more genes responsible for T2DM and could provide a complete list of genetic variants associated with this disease in the future Diabetes is multifactorial epigenome and diabetes indicating its emergence in individuals bausch and lomb allergy genetic predisposition that depends on other factors.

Environment is reported to play a significant role in causing diabetes, epigenome and diabetes. Many environmental factors are known to cause changes in gene expression through epigenetic modifications 5 14such as altered DNA methylation or histone modifications.

It is proposed that the environmental factors activate an intracellular signal, which, epigenome and diabetes, in turn marks the exact chromatin site for epigenetic modifications 14 15 resulting in altered gene expression. Some of the environmental factors occurring during embryogenesis such as maternal diet and intrauterine nutrition and early development could impact health and disease states even in adulthood In addition to these, exposure to heavy metals, pesticides, cigarette smoking, epigenome and diabetes, and even deficiencies of some nutrients folate and methionine can stimulate alteration in epigenetic pathways 8.

Additionally, obesity and age are also shown to alter these epigenetic mechanisms and might result in T2DM 5. In recent years many reports strongly point to the critical role of epigenetic modifications in the development and pathogenesis of cancer, asthma, arthritis, hypertension, etc. Lately epigenetic modifications are also implicated in the development of T2DM Figure 2. Genes involved in the production and release of insulin are reported to be altered in diabetic islets compared to non-diabetic ones.

Over of the genes also had altered expression and many of these could contribute to reduced insulin production. This observation provides an evidence of diabetes associated epigenetic modifications and associated impaired insulin release 1.

Proposed epigenetics mechanisms involved in the development of diabetes 5. This gene was found to be under-expressed and hypermethylated in type 2 diabetes pancreatic islets. Recently it is pointed out that small changes in gene expression may have a epigenome and diabetes effect on diabetes over long periods of time Expression of blackhawks boyle and diabetes gene was positively correlated to glucose-stimulated insulin release from human islet cells This gene was also down-regulated in individuals who were physically inactive, a lifestyle of which is established to be one of the risk factors for diabetes Another gene Chocolate prozac and gag and gift located on chromosome -9, is found to be hyper-methylated in diabetic patients and hyperglycemia upregulates its expression and is implicated in diabetic nephropathy One of the miRNAs specific to pancreatic islets is miR Over-expression of this miRNA is found to reduce glucose-stimulated insulin release while its inhibition resulted in increase in insulin secretion Histone modifications are also reported in diabetic patients.

An in vitro study showed increased histone acetylation which in turn promoted inflammatory gene expression Lastly, hyperglycemia induced histone modifications and DNA methylation of pro-inflammatory genes triggering the vascular inflammation are also reported Thus emergence of diabetes in an individual is quite complex epigenome and diabetes results from the complex interaction between genes and environment.

Many studies point to epigenetic modifications in mediating this interaction. Diabetes is a complex metabolic disorder characterized by hyperglycemia, insufficient insulin secretion and insulin resistance, epigenome and diabetes.

Incidence of diabetes is growing at an alarming rate at about new cases per day in the US. This disease runs in families, indicating that it has a genetic origin and genome wide association studies indicate about gene variants associated with this disease.

Though genes predispose a person to develop this disease, environment also contributes to its prevalence, epigenome and diabetes. The risk factors for diabetes include sedentary lifestyle, obesity and aging. Many studies point to epigenetic modifications DNA methylation and histone modifications in mediating this interaction. Stay up-to-date with our weekly posts on epigenetics and health, epigenome and diabetes, nutrition, exercise, and more.

Scientists have thought that differences in traits that exist along a continuum like skin color, height, epigenome and diabetes, intelligence, ability to gain About Mary Vagula 1 Article, epigenome and diabetes. She teaches physiology, human biology and cell biochemistry to undergraduate students and her research interests include xenobiotic toxicity, environmental pollution and diabetes.

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Epigenome and diabetes