Cancer Causes & Control

, Volume 22, Issue 3, pp 437–447 | Cite as

Repetitive element hypomethylation in blood leukocyte DNA and cancer incidence, prevalence, and mortality in elderly individuals: the Normative Aging Study

  • Zhong-Zheng Zhu
  • David Sparrow
  • Lifang Hou
  • Letizia Tarantini
  • Valentina Bollati
  • Augusto A. Litonjua
  • Antonella Zanobetti
  • Pantel Vokonas
  • Robert O. Wright
  • Andrea Baccarelli
  • Joel Schwartz
Original paper

Abstract

Background

Global genomic hypomethylation is a common epigenetic event in cancer that mostly results from hypomethylation of repetitive DNA elements. Case–control studies have associated blood leukocyte DNA hypomethylation with several cancers. Because samples in case–control studies are collected after disease development, whether DNA hypomethylation is causal or just associated with cancer development is still unclear.

Methods

In 722 elderly subjects from the Normative Aging Study cohort, we examined whether DNA methylation in repetitive elements (Alu, LINE-1) was associated with cancer incidence (30 new cases, median follow-up: 89 months), prevalence (205 baseline cases), and mortality (28 deaths, median follow-up: 85 months). DNA methylation was measured by bisulfite pyrosequencing.

Results

Individuals with low LINE-1 methylation (<median) had a 3.0-fold (95%CI 1.3–6.9) increased incidence of all cancers combined. LINE-1 and Alu methylation were not significantly associated with cancer prevalence at baseline (all cancers combined). However, individuals with low LINE-1 methylation (<median) had a 3.2-fold (95% CI 1.4–7.5) higher prevalence of lung cancer. Individuals with low LINE-1 or Alu methylation (<median) had increased cancer mortality (HR = 3.2, 95%CI 1.3–7.9 for LINE-1; HR = 2.5, 95%CI 1.1–5.8 for Alu).

Conclusion

These findings suggest that individuals with lower repetitive element methylation are at high risk of developing and dying from cancer.

Keywords

Repetitive elements DNA methylation Epigenetics Blood Cancer risk 

Notes

Acknowledgments

This work was supported by National Institute of Environmental Health Sciences grants ES015172-01; New Investigator funding from the HSPH-NIEHS Center for Environmental Health (ES000002); Environmental Protection Agency grants R83241601 and R827353; and Italian Association for Cancer Research (AIRC-6016). The VA Normative Aging Study is supported by the Cooperative Studies Program/Epidemiology Research and Information Center of the U.S. Department of Veterans Affairs and is a component of the Massachusetts Veterans Epidemiology Research and Information Center (MAVERIC).

Supplementary material

10552_2010_9715_MOESM1_ESM.doc (112 kb)
Supplementary material 1 (DOC 112 kb)

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Zhong-Zheng Zhu
    • 1
    • 2
  • David Sparrow
    • 3
  • Lifang Hou
    • 4
  • Letizia Tarantini
    • 1
  • Valentina Bollati
    • 1
  • Augusto A. Litonjua
    • 5
  • Antonella Zanobetti
    • 6
  • Pantel Vokonas
    • 3
  • Robert O. Wright
    • 5
    • 6
  • Andrea Baccarelli
    • 1
    • 6
  • Joel Schwartz
    • 6
  1. 1.Center of Molecular and Genetic Epidemiology, Department of Environmental and Occupational HealthUniversità degli Studi di Milano and IRCCS Maggiore Policlinico Hospital, Mangiagalli and Regina Elena FoundationMilanItaly
  2. 2.Department of OncologyNo.3 People’s Hospital, School of Medicine, Shanghai Jiaotong UniversityShanghaiChina
  3. 3.VA Normative Aging Study, Veterans Affairs Boston Healthcare System and the Department of MedicineBoston University School of MedicineBostonUSA
  4. 4.Department of Preventive Medicine & Robert H. Lurie Comprehensive Cancer Center, Feinberg School of MedicineNorthwestern UniversityChicagoUSA
  5. 5.Channing Laboratory, Department of Medicine, Brigham and Women’s HospitalHarvard Medical SchoolBostonUSA
  6. 6.Exposure Epidemiology and Risk ProgramHarvard School of Public HealthBostonUSA

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