Nutrition Research and Practice

The Korean Nutrition Society (한국영양학회)
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Genome-wide hepatic DNA methylation changes in high-fat diet-induced obese mice

  • Yoon, AhRam (Department of Food and Nutrition, College of Human Ecology, Seoul National University) ;
  • Tammen, Stephanie A. (Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University) ;
  • Park, Soyoung (Department of Food and Nutrition, College of Human Ecology, Seoul National University) ;
  • Han, Sung Nim (Department of Food and Nutrition, College of Human Ecology, Seoul National University) ;
  • Choi, Sang-Woon (Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University)
  • Received : 2016.07.12
  • Accepted : 2016.12.06
  • Published : 2017.04.01
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Abstract

BACKGROUND/OBJECTIVES: A high-fat diet (HFD) induces obesity, which is a major risk factor for cardiovascular disease and cancer, while a calorie-restricted diet can extend life span by reducing the risk of these diseases. It is known that health effects of diet are partially conveyed through epigenetic mechanism including DNA methylation. In this study, we investigated the genome-wide hepatic DNA methylation to identify the epigenetic effects of HFD-induced obesity. MATERIALS AND METHODS: Seven-week-old male C57BL/6 mice were fed control diet (CD), calorie-restricted control diet (CRCD), or HFD for 16 weeks (after one week of acclimation to the control diet). Food intake, body weight, and liver weight were measured. Hepatic triacylglycerol and cholesterol levels were determined using enzymatic colorimetric methods. Changes in genome-wide DNA methylation were determined by a DNA methylation microarray method combined with methylated DNA immunoprecipitation. The level of transcription of individual genes was measured by real-time PCR. RESULTS: The DNA methylation statuses of genes in biological networks related to lipid metabolism and hepatic steatosis were influenced by HFD-induced obesity. In HFD group, a proinflammatory Casp1 (Caspase 1) gene had hypomethylated CpG sites at the 1.5-kb upstream region of its transcription start site (TSS), and its mRNA level was higher compared with that in CD group. Additionally, an energy metabolism-associated gene Ndufb9 (NADH dehydrogenase 1 beta subcomplex 9) in HFD group had hypermethylated CpG sites at the 2.6-kb downstream region of its TSS, and its mRNA level was lower compared with that in CRCD group. CONCLUSIONS: HFD alters DNA methylation profiles in genes associated with liver lipid metabolism and hepatic steatosis. The methylation statuses of Casp1 and Ndufb9 were particularly influenced by the HFD. The expression of these genes in HFD differed significantly compared with CD and CRCD, respectively, suggesting that the expressions of Casp1 and Ndufb9 in liver were regulated by their methylation statuses.

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References

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