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DNA methylation of nuclear receptor genes--possible role in malignancy
1Department of Obstetrics and Gynecology, University Hospital, 6020 Innsbruck, Austria.
Abstract:
The members of the nuclear receptor superfamily are known to mediate a wide array of basic biological processes, such as regulation of cell growth and differentiation, and induction of apoptosis. In several human malignancies, this central control function of nuclear receptors is disturbed, which seems to play an important role in tumor development and progression. Many nuclear receptor genes have been reported to be downregulated in malignancies; however, only a few mutations, gene arrangements, deletions or similar genetic changes have been shown to occur in these tumors. During the last decade, increasing attention has been directed towards epigenetic mechanisms of gene regulation such as DNA methylation. Many nuclear receptor genes can be silenced through aberrant methylation in tumors; epigenetic silencing, therefore, represents an additional mechanism that modifies expression of key genes during carcinogenesis. This review will give insights into the role of DNA methylation in the silencing of nuclear receptor genes and its involvement in human malignancies.
Insights
Nuclear receptors regulate cell growth and differentiation. Aberrant DNA methylation silences these genes in human cancers, contributing to tumor development and progression.
Area of Science:
- Molecular Biology
- Epigenetics
- Cancer Biology
Background:
- Nuclear receptors are crucial for basic biological processes like cell growth, differentiation, and apoptosis.
- Dysregulation of nuclear receptors is implicated in human malignancies, affecting tumor development and progression.
- While genetic alterations are known, epigenetic silencing via DNA methylation is an emerging mechanism for nuclear receptor gene downregulation in cancer.
Purpose of the Study:
- To review the role of DNA methylation in silencing nuclear receptor genes.
- To explore the involvement of epigenetic silencing of nuclear receptors in human malignancies.
Main Methods:
- Literature review focusing on epigenetic mechanisms and nuclear receptor gene regulation.
- Analysis of studies investigating DNA methylation patterns in cancer.
Main Results:
- Aberrant DNA methylation is a significant mechanism for silencing nuclear receptor genes in tumors.
- Epigenetic silencing modifies the expression of key genes during carcinogenesis.
- This silencing contributes to the development and progression of human malignancies.
Conclusions:
- DNA methylation plays a critical role in the aberrant silencing of nuclear receptor genes in human cancers.
- Epigenetic modifications represent a key pathway through which nuclear receptor function is disrupted in malignancies.
- Understanding these epigenetic mechanisms is vital for comprehending cancer development.