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Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 (Kir4.1)
Published on: September 26, 2015
DNA methylation in brain development and gliomagenesis
1The Brain Tumor Research Center, Department of Neurological Surgery, University of California, San Francisco, 2340 Sutter, San Francisco, CA 94115, USA. jcostello@cc.ucsf.edu
Abstract:
The underlying basis of human tumors involves genomic alterations that activate oncogenes and inactivate tumor suppressor genes, culminating in unregulated cell growth. The existing models of tumorigenesis, the selection of subsets of genes contributing to this process and many cancer therapies are based on this genomic approach. However, epigenomic alterations such as gene silencing by aberrant methylation of promoters are also involved in tumorigenesis, but because methylation is not detected by standard genome screening many of these genes have remained undiscovered. Advances in our ability to observe the methylation status of the entire cancer cell genome have led to the unmistakable conclusion that methylation abnormalities are far more prevalent than expected, particularly in low-grade gliomas where genomic changes are less common. In addition, the aberrant methylation of particular genes can influence tumor response to therapy and is strongly associated with patient survival. Thus it is likely that our understanding of tumor genomes is far from complete, and that a significant number of prognostic indicators and therapeutic targets remain to be explored. These studies raise important questions regarding the relative contribution of genomic and epigenomic mechanisms in the genesis and malignant progression of gliomas. Here I begin with the evidence supporting a role for methylation in normal brain cell function and the consequence of its dysfunction, and conclude with an effort to integrate epigenomic views of the genesis of sporadic brain tumors with the traditional genomic model.
Insights
Epigenomic alterations, specifically aberrant DNA methylation, play a significant role in tumor development, particularly in low-grade gliomas. Understanding these methylation changes is crucial for identifying new therapeutic targets and improving patient survival.
Area of Science:
- Neuro-oncology
- Cancer epigenetics
- Genomics and epigenomics
Background:
- Tumorigenesis is traditionally viewed as driven by genomic alterations activating oncogenes and inactivating tumor suppressor genes.
- Epigenomic alterations, such as promoter methylation causing gene silencing, are increasingly recognized as critical in cancer development.
- Standard genomic screening often misses these crucial epigenomic changes.
Purpose of the Study:
- To investigate the prevalence and significance of epigenomic alterations, particularly DNA methylation, in tumorigenesis.
- To explore the role of methylation in normal brain cell function and its dysfunction in brain tumors.
- To integrate epigenomic insights with traditional genomic models for a comprehensive understanding of glioma genesis and progression.
Main Methods:
- Genome-wide methylation analysis in cancer cells.
- Comparison of methylation patterns in tumor tissues versus normal brain cells.
- Correlation of methylation status with tumor characteristics, therapeutic response, and patient survival.
Main Results:
- Aberrant methylation is highly prevalent in tumors, especially in low-grade gliomas where genomic alterations are less common.
- Methylation abnormalities significantly impact tumor progression and patient survival.
- Specific methylation patterns are linked to tumor response to therapy.
Conclusions:
- Our understanding of tumor genomes is incomplete, with many prognostic and therapeutic targets potentially residing in the epigenome.
- Aberrant DNA methylation is a key driver in glioma development and progression, necessitating its consideration alongside genomic alterations.
- Further research integrating genomic and epigenomic data is vital for advancing brain tumor diagnosis and treatment.
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