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Regulation of transcription factor activity during cellular aging
K Wheaton1, P Atadja, K Riabowol
1Department of Medical Biochemistry, University of Calgary Health Sciences Centre, AB, Canada.
Abstract:
Several lines of evidence suggest that the limited replication potential of normal human cells is due to the presence of an intrinsic genetic programme. This "senescence programme" is believed to reduce the incidence of cancer by limiting the growth of most of the transformed cells arising in vivo, although some cells do escape senescence becoming both immortalized and transformed. Here we review the literature that describes the senescence process in terms of gene expression and the regulation of gene expression by a variety of mechanisms affecting transcription factor activity. We focus on regulation of the c-fos gene through posttranslational modification of the serum response factor (SRF) as an example of altered gene expression during cellular aging.
Insights
Normal human cells have a genetic senescence program that limits their replication and reduces cancer incidence. This review explores gene expression changes during cellular aging, focusing on transcription factor regulation.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Cellular senescence is an intrinsic genetic program limiting normal human cell replication.
- Senescence acts as a tumor-suppressive mechanism by inhibiting transformed cell growth.
- Some cells evade senescence, leading to immortalization and transformation.
Purpose of the Study:
- To review the literature on cellular senescence.
- To describe the senescence process in terms of gene expression.
- To examine the regulation of gene expression during cellular aging, focusing on transcription factor activity.
Main Methods:
- Literature review of cellular senescence.
- Analysis of gene expression during aging.
- Focus on transcription factor regulation, including posttranslational modification.
Main Results:
- Senescence involves alterations in gene expression patterns.
- Transcription factor activity is regulated by various mechanisms during aging.
- Posttranslational modification of serum response factor (SRF) impacts c-fos gene regulation.
Conclusions:
- Cellular senescence is a key genetic program with implications for cancer prevention.
- Understanding gene expression regulation in senescence is crucial for aging research.
- Altered gene expression, exemplified by SRF and c-fos, characterizes cellular aging.