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Genome-Wide CRISPR Screen for Unveiling Radiosensitive and Radioresistant Genes
Published on: May 23, 2025
A genome-wide RNAi screen reveals multiple regulators of caspase activation
Caroline H Yi1, Dodzie K Sogah, Michael Boyce
1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
Abstract:
Apoptosis is an evolutionally conserved cellular suicide mechanism that can be activated in response to a variety of stressful stimuli. Increasing evidence suggests that apoptotic regulation relies on specialized cell death signaling pathways and also integrates diverse signals from additional regulatory circuits, including those of cellular homeostasis. We present a genome-wide RNA interference screen to systematically identify regulators of apoptosis induced by DNA damage in Drosophila melanogaster cells. We identify 47 double- stranded RNA that target a functionally diverse set of genes, including several with a known function in promoting cell death. Further characterization uncovers 10 genes that influence caspase activation upon the removal of Drosophila inhibitor of apoptosis 1. This set includes the Drosophila initiator caspase Dronc and, surprisingly, several metabolic regulators, a candidate tumor suppressor, Charlatan, and an N-acetyltransferase, ARD1. Importantly, several of these genes show functional conservation in regulating apoptosis in mammalian cells. Our data suggest a previously unappreciated fundamental connection between various cellular processes and caspase-dependent cell death.
Insights
This study identifies key genes regulating programmed cell death (apoptosis) in fruit flies, revealing a surprising link between cellular metabolism and cell suicide pathways conserved in humans.
Area of Science:
- Cell Biology
- Genetics
- Biochemistry
Background:
- Apoptosis is a vital, evolutionarily conserved process of programmed cell death.
- Cellular suicide is regulated by complex signaling pathways and homeostasis circuits.
- Understanding apoptosis regulators is crucial for disease research.
Purpose of the Study:
- To systematically identify genes that regulate apoptosis induced by DNA damage.
- To uncover novel regulators of caspase activation in Drosophila melanogaster.
- To investigate the conservation of these regulators in mammalian cells.
Main Methods:
- Genome-wide RNA interference (RNAi) screen in Drosophila melanogaster cells.
- Identification of double-stranded RNA targeting diverse genes.
- Functional characterization of genes influencing caspase activation.
Main Results:
- Identified 47 double-stranded RNAs targeting functionally diverse genes involved in cell death.
- Uncovered 10 genes regulating caspase activation, including initiator caspase Dronc.
- Discovered metabolic regulators and Charlatan (tumor suppressor) as novel apoptosis regulators.
- Demonstrated functional conservation of several identified genes in mammalian apoptosis.
Conclusions:
- Established a comprehensive set of apoptosis regulators in Drosophila.
- Revealed a fundamental, previously unappreciated link between cellular processes and caspase-dependent cell death.
- Highlighted the conserved nature of apoptosis regulation across species, offering therapeutic insights.
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