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Mechanisms underlying epigenetically mediated gene silencing in cancer
1The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Bunting-Blaustein Cancer Research Building, 1650 Orleans Street, Suite 541, Baltimore, MD 21231, USA. sbaylin@jhmi.edu
Abstract:
It has become apparent that epigenetically mediated alterations, which establish heritable abnormalities in gene expression, are a fundamental feature of human cancer. The best studied of these changes are aberrant gene silencing events which involve transcriptional inactivation associated with abnormally methylated promoter region CpG islands. A most important aspect of understanding this change, which can cause loss of key gene function, concerns dissection of the molecular mechanisms that mediate the transcriptional repression and those responsible for establishing the abnormal methylation and associated chromatin events. This chapter reviews the progress in these arenas.
Insights
Epigenetic alterations, like abnormal DNA methylation, are key in human cancers. Understanding the molecular mechanisms behind gene silencing and methylation is crucial for cancer research and treatment strategies.
Area of Science:
- Oncology
- Epigenetics
- Molecular Biology
Background:
- Epigenetic alterations are fundamental to human cancer development.
- Aberrant gene silencing via promoter CpG island hypermethylation is a well-studied mechanism.
- Loss of key gene function results from these epigenetic changes.
Purpose of the Study:
- To review progress in understanding epigenetic alterations in cancer.
- To dissect molecular mechanisms of transcriptional repression in cancer.
- To explore mechanisms establishing abnormal DNA methylation and chromatin events.
Main Methods:
- Review of current literature on cancer epigenetics.
- Analysis of molecular mechanisms of gene silencing.
- Examination of chromatin remodeling in cancer.
Main Results:
- Significant progress has been made in understanding epigenetic modifications in cancer.
- Key molecular players in transcriptional repression and DNA methylation are being identified.
- The interplay between DNA methylation and chromatin structure in gene silencing is increasingly understood.
Conclusions:
- Epigenetic changes, particularly DNA methylation, are central to cancer.
- Further research into these mechanisms is vital for developing targeted cancer therapies.
- Dissecting these molecular events offers potential for novel diagnostic and therapeutic strategies.