Premature aging of leukocyte DNA methylation is associated with type 2 diabetes prevalence

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• 作者：Gidon Toperoff (1)
  Jeremy D Kark (2)
  Dvir Aran (1) (5)
  Hisham Nassar (3) (4)
  Wiessam Abu Ahmad (2)
  Ronit Sinnreich (2)
  Dima Azaiza (1)
  Benjamin Glaser (6)
  Asaf Hellman (1)
  
  1. Department of Developmental Biology and Cancer Research ; Institute for Medical Research Israel-Canada ; Hebrew University-Hadassah Medical School ; Jerusalem ; 91120 ; Israel
  2. Epidemiology Unit ; Braun School of Public Health and Community Medicine ; Hebrew University and Hadassah Medical Organization ; Jerusalem ; Israel
  5. School of Computer Science and Engineering ; Hebrew University ; Jerusalem ; Israel
  3. Cardiology Department ; Hadassah-Hebrew University Medical Center ; Hadassah Medical Organization ; Ein Kerem ; Jerusalem ; Israel
  4. St Joseph Hospital (East Jerusalem) ; Jerusalem ; Israel
  6. Endocrinology and Metabolism Service ; Department of Internal Medicine ; Hadassah-Hebrew University Medical Center ; Hadassah Medical Organization ; Ein Kerem ; Jerusalem ; Israel
  
• 关键词：Type 2 diabetes ; DNA methylation ; Epigenetic aging ; Leukocytes ; East Jerusalem Palestinians ; Ashkenazi Jews ; Population epigenetics ; Ethnic groups
• 刊名：Clinical Epigenetics
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：7
• 期：1
• 全文大小：488 KB
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• 刊物主题：Human Genetics; Gene Function;
• 出版者：BioMed Central
• ISSN：1868-7083

文摘

Background Type 2 diabetes mellitus (T2D) is highly prevalent in Middle-Eastern and North African Arab populations, but the molecular basis for this susceptibility is unknown. Altered DNA methylation levels were reported in insulin-secreting and responding tissues, but whether methylation in accessible tissues such as peripheral blood is associated with T2D risk remains an open question. Age-related alteration of DNA methylation level was reported in certain methylation sites, but no association with T2D has been shown. Here we report on a population-based study of 929 men and women representing the East Jerusalem Palestinian (EJP) Arab population and compare with the findings among Israeli Ashkenazi Jews. This is the first reported epigenetic study of an Arab population with a characteristic high prevalence of T2D. Results We found that DNA methylation of a prespecified regulatory site in peripheral blood leukocytes (PBLs) is associated with impaired glucose metabolism and T2D independent of sex, body mass index, and white blood cell composition. This CpG site (Chr16: 53,809,231-2; hg19) is located in a region within an intron of the FTO gene, suspected to serve as a tissue-specific enhancer. The association between PBL hypomethylation and T2D varied by age, revealing differential patterns of methylation aging in healthy and diabetic individuals and between ethnic groups: T2D patients displayed prematurely low methylation levels, and this hypomethylation was greater and occurred earlier in life among Palestinian Arabs than Ashkenazi Jews. Conclusions Our study suggests that premature DNA methylation aging is associated with increased risk of T2D. These findings should stimulate the search for more such sites and may pave the way to improved T2D risk prediction within and between human populations.