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Gene regulation associated with apoptosis
1Department of Veterinary and Animal Sciences, University of Massachusetts at Amherst, USA.
Abstract:
Apoptosis, one of the best-studied forms of programmed cell death processes, plays an important role during the development and life-cycle of most multicellular organisms. The mechanisms underlying the initiation and manifestation of apoptotic cell death are the focus of the most recent cell death research. Generally, it is believed that cells are eliminated via a highly ordered and controlled program. This program might consist of the successive activation of unique apoptosis-specific genes, which are solely involved in the regulation of the programmed cell death. However, more and more evidence is accumulating that novel genes are not activated or induced during apoptosis, but rather many well-known genes previously described for their roles in processes such as proliferation and differentiation and belonging, for example, to the protein families of immediate-early genes and transcription factors become activated. The death-specific feature is achieved thereby by the extent, combination, and specific timing of gene expression. The involvement of the three different transcription factors glucocorticoid receptor (GR), nur77, and activator protein 1 (AP-1) in such a scenario is the focus of this review.
Insights
Programmed cell death (apoptosis) involves known genes, not just new ones. Specific timing and combinations of gene activation, including transcription factors like glucocorticoid receptor (GR), nur77, and activator protein 1 (AP-1), regulate this process.
Area of Science:
- Cell Biology
- Molecular Biology
Background:
- Apoptosis is a crucial programmed cell death process in multicellular organisms.
- Research is actively investigating the molecular mechanisms initiating and executing apoptosis.
- Traditionally, apoptosis was thought to involve unique, apoptosis-specific genes.
Purpose of the Study:
- To review the role of specific transcription factors in apoptosis.
- To highlight the activation of known genes during programmed cell death.
- To explore how gene expression patterns dictate cell death specificity.
Main Methods:
- Literature review focusing on gene activation in apoptosis.
- Analysis of the roles of glucocorticoid receptor (GR), nur77, and activator protein 1 (AP-1).
- Examination of gene expression timing, extent, and combinations.
Main Results:
- Evidence suggests apoptosis utilizes known genes involved in proliferation and differentiation.
- Immediate-early genes and transcription factors are activated during programmed cell death.
- The specific context of gene activation, not novel genes, defines the apoptotic outcome.
Conclusions:
- Apoptosis relies on the regulated expression of existing genes.
- Transcription factors like GR, nur77, and AP-1 are key players in modulating apoptotic gene expression.
- The precise temporal and combinatorial activation of genes determines the cell death phenotype.