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Updated: Jul 10, 2026
07:50
Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
Published on: September 18, 2020
Sequential gene promoter methylation during HPV-induced cervical carcinogenesis
F E Henken1, S M Wilting, R M Overmeer
1Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands.
British Journal of Cancer
|November 1, 2007
Summary
DNA methylation in cervical carcinomas links to HPV transformation stages. Promoter methylation of eight genes, including MGMT, occurs during HPV-induced cervical cell progression.
Area of Science:
- Epigenetics
- Molecular Biology
- Cancer Research
Background:
- Cervical carcinomas are linked to persistent Human Papillomavirus (HPV) infection.
- DNA methylation is a key epigenetic mechanism implicated in cancer development.
- Understanding methylation patterns in HPV-induced cervical carcinogenesis is crucial for early detection and therapeutic strategies.
Purpose of the Study:
- To correlate specific DNA methylation events in cervical carcinomas with distinct stages of HPV-driven cellular transformation.
- To investigate the temporal appearance of gene promoter methylation during HPV-induced cervical cell progression in an in vitro model.
- To identify recurrent methylation signatures associated with cervical tumorigenesis.
Main Methods:
- Methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA) was employed to analyze DNA methylation.
- Analysis was performed on primary cervical carcinomas and a series of HPV16/18-transfected keratinocyte cell lines representing sequential transformation stages.
- Cervical cancer cell lines were also analyzed to identify methylation patterns in fully tumorigenic cells.
Main Results:
- Promoter methylation was detected in 12 of 29 analyzed tumor suppressor genes in cervical carcinomas, with MGMT being the most frequent (92%).
- Progression to anchorage independence in vitro was associated with methylation of five genes (TP73, ESR1, RARbeta, DAPK1, MGMT), which were also methylated in cervical carcinomas.
- Cervical cancer cell lines showed additional methylation in CADM1, CDH13, and CHFR.
Conclusions:
- Eight recurrent DNA methylation events in cervical carcinomas can be assigned to specific stages of HPV-induced transformation.
- The in vitro model system effectively recapitulates epigenetic alterations observed in cervical cancer.
- This study provides a valuable tool for further functional investigation of epigenetic changes in cervical carcinogenesis.
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