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Fas ligand, death gene
1Division of Cellular Immunology, La Jolla Institute for Allergy and Immunology, 10355 Science Center Drive, San Diego, California, CA 92121, USA. michael@liai.org
Abstract:
The concept of death genes goes back to the early days of programmed cell death, when a researcher's model system was required to be dependent on transcription of the dying cell in order to qualify as apoptosis. In 1987 Andrew Wyllie,1 one of the pioneers of cell death research, outlined four 'cardinal elements' of apoptosis: one of which was a requirement for macromolecular synthesis. In the following years the complexity of the apoptotic process has become evident and while it is now clear that apoptosis does not have to rely on gene expression, the idea of death genes remains. Induction of an apoptotic cascade via activation of caspases, selective release of mitochondrial proteins and further activation of caspases, can be stimulated by engagement of the Fas surface molecule via membrane bound or soluble forms of Fas ligand (FasL). The FasL gene, which is often transcriptionally inactive, becomes activated in many forms of transcription/translation dependent apoptosis. Here we will discuss FasL as a candidate death gene.
Insights
The concept of death genes has evolved, with early apoptosis research requiring gene expression. Fas Ligand (FasL) is now considered a candidate death gene, even when transcriptionally inactive.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Early apoptosis research required gene expression, defining 'death genes'.
- The complexity of apoptosis is now understood, not always relying on gene expression.
- The concept of 'death genes' persists despite evolving understanding.
Purpose of the Study:
- To discuss Fas Ligand (FasL) as a candidate death gene.
- To explore the role of FasL in transcription/translation-dependent apoptosis.
Main Methods:
- Review of historical apoptosis research and definitions.
- Analysis of the FasL gene's role in apoptotic pathways.
- Discussion of FasL activation in transcription/translation-dependent apoptosis.
Main Results:
- Apoptosis mechanisms are complex and do not always require gene expression.
- FasL can induce apoptotic cascades via caspase activation.
- FasL gene activation occurs in various transcription/translation-dependent apoptotic forms.
Conclusions:
- FasL is a significant candidate for a 'death gene'.
- FasL plays a crucial role in specific apoptotic pathways.
- Further research into FasL's function in cell death is warranted.
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