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Defining Gene Functions in Tumorigenesis by Ex vivo Ablation of Floxed Alleles in Malignant Peripheral Nerve Sheath Tumor Cells
Published on: August 25, 2021
Aberrant gene silencing in tumor progression: implications for control of cancer
1The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland 21231, USA.
Abstract:
Although it is clear that genetic alterations are critical for the initiation and maintenance of human cancer, it is also becoming evident that epigenetic changes may be essential for the development of these diseases as well. The best studied of these latter processes is heritable transcriptional repression of genes associated with aberrant DNA hypermethylation of their promoters. Herein we review how very early occurrence of these gene silencing events may contribute to loss of key gene functions which result in disruption of cell regulatory pathways that may contribute to abnormal cell population expansion. These altered regulatory events may then provide a setting where mutations in the same disrupted pathways may be readily selected and serve to lock tumor progression into place. This hypothesis has potential impact on means to prevent and control cancer and for the use of epigenetic markers for cancer risk assessment and early diagnosis.
Insights
Epigenetic changes, specifically DNA hypermethylation causing gene silencing, are crucial in early cancer development. These events disrupt cell regulation, paving the way for mutations that drive tumor progression and offering new diagnostic markers.
Area of Science:
- Oncology
- Epigenetics
- Molecular Biology
Background:
- Genetic alterations are key drivers of human cancer initiation and progression.
- Epigenetic modifications, particularly DNA methylation, are increasingly recognized as essential in cancer development.
- Heritable transcriptional repression via promoter hypermethylation is a well-studied epigenetic process in cancer.
Purpose of the Study:
- To review the role of early epigenetic changes in cancer development.
- To explore how DNA hypermethylation-induced gene silencing contributes to disrupted cellular regulation.
- To discuss the implications of these findings for cancer prevention, risk assessment, and early diagnosis.
Main Methods:
- Review of existing literature on epigenetic alterations in cancer.
- Analysis of the mechanisms linking DNA hypermethylation, gene silencing, and pathway disruption.
- Hypothesizing the interplay between early epigenetic events and subsequent genetic mutations.
Main Results:
- Early epigenetic gene silencing through DNA hypermethylation can lead to the loss of critical gene functions.
- Disruption of cellular regulatory pathways by epigenetic changes creates an environment conducive to tumor progression.
- These altered pathways facilitate the selection and fixation of cancer-promoting mutations.
Conclusions:
- Epigenetic silencing is an early event in tumorigenesis, preceding or cooperating with genetic mutations.
- Understanding these epigenetic mechanisms offers potential strategies for cancer prevention and control.
- Epigenetic markers hold promise for cancer risk assessment and early detection.
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