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Death-associated proteins: from gene identification to the analysis of their apoptotic and tumour suppressive
Abstract:
Aberrations of apoptosis are implicated in many diseases, including cancer, autoimmune disease, cardiovascular disease and neurodegeneration. The cell's apoptotic machinery is, therefore, an important potential target for the development of new therapies. Our laboratory has used a strategy called technical knockout (TKO) to identify novel genes involved in apoptosis. TKO is based on random inactivation of gene expression with antisense cDNA libraries, followed by selection of those cells that survive in the continuous presence of an apoptotic stimulus. Using this approach, we have isolated five novel genes, including a serine/threonine kinase, a nucleotide-binding protein and a homologue of the p220 translation initiation factor. Expression of one of these genes (DAP kinase) is lost in some cancers, and this loss appears to increase the metastatic potential of some tumours.
Insights
Researchers identified novel genes regulating apoptosis, a key cell death process implicated in diseases like cancer. Technical knockout (TKO) revealed five new genes, including DAP kinase, whose loss correlates with increased tumor metastasis.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Apoptosis (programmed cell death) plays a crucial role in numerous diseases, including cancer and autoimmune disorders.
- Dysregulation of apoptotic pathways presents a significant therapeutic target for various pathologies.
- Identifying novel genes involved in apoptosis is critical for developing new treatment strategies.
Purpose of the Study:
- To discover novel genes that regulate the process of apoptosis using a functional genomics approach.
- To investigate the role of newly identified apoptosis-related genes in disease, particularly cancer.
Main Methods:
- Utilized a technical knockout (TKO) strategy involving random antisense cDNA library screening.
- Applied selection pressure by maintaining cells under continuous apoptotic stimulation.
- Isolated and identified genes that, upon inactivation, confer resistance to apoptosis.
Main Results:
- Successfully identified five novel genes involved in the regulation of apoptosis.
- Characterized genes including a serine/threonine kinase, a nucleotide-binding protein, and a translation initiation factor homologue.
- Observed that loss of DAP kinase expression in certain cancers is associated with increased tumor metastatic potential.
Conclusions:
- The technical knockout (TKO) approach is effective for identifying novel apoptosis regulators.
- Discovered several new genes with potential roles in controlling cell death.
- DAP kinase is a significant finding, with its downregulation linked to cancer progression and metastasis, suggesting its potential as a therapeutic target.