Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Epigenetic analysis of healthy young men following a control and high-fat overfeeding diet

ABSTRACT: Genome-wide DNA methylation profiling of healthy young men following a control and high-fat overfeeding diet using Illumina's Infinium 27k Human DNA methylation Beadchip v. 1.2. DNA methylation profiles were obtained for 27,578 CpG sites in human skeletal muscle. Randomized cross-over desgin, where all subjects receieved both treatments (control and high-fat overfeeding diet). Biopsies were obtained from 23 different individuals amounting to 22 samples following the control diet and 22 samples following the high-fat overfeeding diet (paired n=21). Bisulphite converted DNA from the 44 samples were hybridised to the Illumina Infinium 27k Human Methylation Beadchip.

ORGANISM(S): Homo sapiens

SUBMITTER: Stine Jacobsen

PROVIDER: E-GEOD-36166 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Effects of short-term high-fat overfeeding on genome-wide DNA methylation in the skeletal muscle of healthy young men.

Jacobsen S C SC Brøns C C Bork-Jensen J J Ribel-Madsen R R Yang B B Lara E E Hall E E Calvanese V V Nilsson E E Jørgensen S W SW Mandrup S S Ling C C Fernandez A F AF Fraga M F MF Poulsen P P Vaag A A

Diabetologia 20120908 12

<h4>Aims/hypothesis</h4>Energy-dense diets that are high in fat are associated with a risk of metabolic diseases. The underlying molecular mechanisms could involve epigenetics, as recent data show altered DNA methylation of putative type 2 diabetes candidate genes in response to high-fat diets. We examined the effect of a short-term high-fat overfeeding (HFO) diet on genome-wide DNA methylation patterns in human skeletal muscle.<h4>Methods</h4>Skeletal muscle biopsies were obtained from 21 healt ...[more]

PMID: 22961225

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Project description:Background: Post-menopausal obesity is an established risk factor for breast cancer. Consumption of diets high in fat is known to be highly correlated with obesity. In this, we sought to evaluate the interaction(s) between high fat diet, weight gain and mammary carcinogenesis using an obese-resistant and obese-prone rat model with direct correlates to human disease. Methods: Female obese-prone (OP) and obese-resistant (OR) weanling rats were placed on either a low fat (10% kcal) or a high fat (39% kcal) n-6 polyunsaturated (PUFA) safflower diet for 30 days. At post natal day (PND) 50, global gene expression profiling was performed on microdissected mammary epithlelium from one cohort of rats and another cohort of rats were given a single oral gavage of either 7,12-dimethylbenz[a]anthracene (DMBA at 14 mg/kg) or vehicle. Rats were then maintained on the diets and body weights, food consumption and development of mammary lesions were monitored weekly. Results: The DMBA-treated OR rats on the 39% safflower diet had significantly greater incidence of ductal carcinoma-in-situ (DCIS) lesions and significantly greater DCIS multiplicity than DMBA-treated OR rats on the 10% safflower diet. These differences were not seen in the OP strain. Gene expression analysis of mammary ductal epithelium from OR rats on the high fat diet showed significant upregulation of proliferation-related genes compared to those consuming the low fat safflower diet. Again, these differences were not seen in the OP strain. Conclusion: Our findings indicate that consumption of high fat safflower diet enhances mammary carcinogenesis in an OR rat strain through increased proliferation of mammary epithelium at the time of exposure, but not in the OP rat strain. Thus, the diet-induced increase in sensitivity was strain-specific and independent of weight gain or obesity level. Female obese-prone (OP) and obese-resistant (OR) weanling rats were placed on either a low fat (10% kcal) or a high fat (39% kcal) n-6 polyunsaturated (PUFA) safflower diet for 30 days. At post natal day (PND) 50, global gene expression profiling was performed on microdissected mammary epithlelium from one cohort of rats and another cohort of rats were given a single oral gavage of either 7,12-dimethylbenz[a]anthracene (DMBA at 14 mg/kg) or vehicle. Rats were then maintained on the diets and body weights, food consumption and development of mammary lesions were monitored weekly.

Dataset Information

Epigenetic analysis of healthy young men following a control and high-fat overfeeding diet

Publications

Effects of short-term high-fat overfeeding on genome-wide DNA methylation in the skeletal muscle of healthy young men.

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