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The dynamic DNA methylomes of double-stranded DNA viruses associated with human cancer

Agustin F Fernandez1, Cecilia Rosales, Pilar Lopez-Nieva

  • 1Cancer Epigenetics Group, Spanish National Cancer Research Centre (CNIO), Madrid E-28029, Spain.

Genome Research
|February 12, 2009
PubMed

Insights

Viral DNA methylation patterns change during cancer development. This study maps viral methylomes, revealing dynamic epigenetic shifts from infection to invasive tumors, offering insights into cancer progression.

Area of Science:

  • Virology
  • Epigenetics
  • Cancer Biology

Background:

  • Only a minority of virus-infected human tissues progress to cancer, with the molecular reasons largely unknown.
  • Viruses like Human Papillomavirus (HPV), Hepatitis B Virus (HBV), and Epstein-Barr Virus (EBV) are linked to significant human cancers and mortality.
  • Understanding viral roles in tumorigenesis is crucial for public health.

Purpose of the Study:

  • To present the first complete DNA methylomes of double-stranded DNA viruses associated with human cancers.
  • To investigate the dynamic epigenetic changes in viral genomes during disease progression.
  • To identify potential molecular clues explaining why some viral infections lead to cancer.

Main Methods:

  • Whole-genome bisulfite sequencing was used to determine the DNA methylation status of CpG dinucleotides.
  • Analysis focused on Human Papillomavirus types 16 and 18, Hepatitis B Virus, and Epstein-Barr Virus transcription start sites.
  • Multiple clones were sequenced to ensure comprehensive methylation profiling.

Main Results:

  • Complete DNA methylomes for HPV16, HPV18, HBV, and EBV transcription start sites were generated.
  • Viral DNA methylation evolves dynamically, progressing from unmethylated to highly methylated states.
  • These epigenetic changes correlate with disease progression, from asymptomatic carriers to invasive tumors.

Conclusions:

  • Viral DNA methylomes exhibit dynamic epigenetic alterations, contrasting with the stability of the host genome.
  • The observed methylation changes significantly impact viral biological behavior and disease progression.
  • This study provides critical insights into the epigenetics of virus-associated cancers.

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