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Functional cloning of genes involved in T-cell receptor-induced programmed cell death
1T-cell Molecular Biology Unit, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA.
Abstract:
Programmed cell death (PCD) is a normal event under genetic control that regulates the life span of different cell types in multicellular organisms. Among other physiological processes, PCD plays a pivotal role in the regulation of the immune system. Using a functional selection strategy we have isolated and characterized genes involved in T-cell receptor-induced apoptosis. One, ALG-2, is a Ca(2+)-binding protein that participates in regulatory events that occur late in the apoptotic program, where several death signals converge. Another, ALG-3, is a mouse homologue of the chromosome 1 familial Alzheimer's disease gene PS2. ALG-3 codes for a truncated PS2 polypeptide that antagonizes the apoptotic role of PS2. A PS2 mutation associated with Alzheimer's disease generates a molecule with enhanced apoptotic activity indicating that it might accelerate the process of neurodegeneration that occurs in this disease.
Insights
This study identifies genes regulating T-cell receptor-induced apoptosis, including ALG-2 and ALG-3. ALG-3, a PS2 homolog, antagonizes apoptosis, while a PS2 mutation may accelerate Alzheimer
Area of Science:
- Molecular Biology
- Immunology
- Neuroscience
Background:
- Programmed cell death (PCD) is genetically controlled and vital for multicellular organism development and immune system regulation.
- T-cell receptor-induced apoptosis is a critical process in immune system function.
Purpose of the Study:
- To isolate and characterize genes involved in T-cell receptor-induced apoptosis.
- To investigate the roles of ALG-2 and ALG-3 in apoptotic pathways.
- To explore the connection between PS2 gene mutations and Alzheimer's disease pathogenesis.
Main Methods:
- Functional selection strategy for gene isolation.
- Characterization of gene functions in apoptotic pathways.
- Analysis of PS2 homologues and mutations.
Main Results:
- Isolation and characterization of ALG-2, a Ca(2+)-binding protein involved in late apoptotic events.
- Identification of ALG-3 as a mouse homologue of PS2, encoding a truncated polypeptide that antagonizes PS2's apoptotic role.
- A PS2 mutation linked to Alzheimer's disease results in a molecule with increased apoptotic activity.
Conclusions:
- ALG-2 and ALG-3 are key regulators of programmed cell death pathways.
- The balance of PS2 activity is crucial, with mutations potentially accelerating neurodegeneration in Alzheimer's disease.
- Understanding these genes offers insights into immune regulation and neurodegenerative disease mechanisms.