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DNA Methylation of Telomere-Related Genes and Cancer Risk.

Brian T Joyce1, Yinan Zheng2, Drew Nannini2

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DNA methylation changes in telomere-related genes (TRGs) are linked to cancer risk. Altered TRG methylation patterns may explain inconsistent associations between telomere length and cancer development.

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Area of Science:

  • Genetics
  • Epigenetics
  • Cancer Biology

Background:

  • Telomere shortening is hypothesized to promote cancer.
  • Previous studies show inconsistent links between leukocyte telomere length (LTL) and cancer risk.
  • Epigenetic changes in telomere maintenance may explain these inconsistencies.

Purpose of the Study:

  • To investigate the association between DNA methylation in telomere-related genes (TRGs) and cancer incidence.
  • To explore how TRG methylation patterns change over time in relation to cancer development.
  • To examine the relationship between TRG methylation and LTL.

Main Methods:

  • Analysis of 889 blood samples from 475 cancer-free participants over a median of 10.1 years.
  • Profiling of DNA methylation using the Illumina 450K array for 2,651 CpGs across 80 TRGs.
  • Application of Cox and mixed models, logistic regression, and cross-sectional analyses to assess associations with cancer and LTL.

Main Results:

  • 30 CpGs in 23 TRGs showed positive associations with cancer incidence, with 87% located in TRG promoters.
  • One CpG in MAD1L1 was protectively associated with cancer.
  • Methylation trajectories for 21 CpGs increased in cancer cases, with 17 CpGs associated with cancer risk 4-8 years prediagnosis.

Conclusions:

  • TRG DNA methylation is prospectively associated with cancer incidence.
  • Altered TRG methylation may represent a mechanism linking LTL dynamics to cancer risk.
  • Further research is needed to confirm findings and elucidate underlying mechanisms involving telomere maintenance and DNA repair.