Synthetic Lethality Screens Using RNAi in Combination with CRISPR-based Knockout in Drosophila Cells
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Updated: Mar 2, 2026
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Published on: May 30, 2025
Benjamin E Housden1, Hilary E Nicholson1,2, Norbert Perrimon1,3
1Harvard Medical School, Boston, USA.
Abstract:
A synthetic lethal interaction is a type of genetic interaction where the disruption of either of two genes individually has little effect but their combined disruption is lethal. Knowledge of synthetic lethal interactions can allow for elucidation of network structure and identification of candidate drug targets for human diseases such as cancer. In Drosophila, combinatorial gene disruption has been achieved previously by combining multiple RNAi reagents. Here we describe a protocol for high-throughput combinatorial gene disruption by combining CRISPR and RNAi. This approach previously resulted in the identification of highly reproducible and conserved synthetic lethal interactions (Housden et al., 2015).
Insights
Researchers developed a new high-throughput method combining CRISPR and RNAi for gene disruption. This approach identifies synthetic lethal interactions, crucial for understanding disease networks and finding cancer drug targets.
Area of Science:
- Genetics and Genomics
- Molecular Biology
- Systems Biology
Background:
- Synthetic lethal interactions occur when disrupting two genes together is lethal, unlike disrupting them individually.
- Understanding these interactions aids in mapping biological networks and identifying potential therapeutic targets for diseases like cancer.
- Previous methods in Drosophila used multiple RNAi reagents for combinatorial gene disruption.
Purpose of the Study:
- To describe a novel protocol for high-throughput combinatorial gene disruption.
- To leverage the CRISPR and RNAi systems for efficient gene targeting.
- To identify reproducible and conserved synthetic lethal interactions.
Main Methods:
- Development of a protocol integrating CRISPR and RNAi technologies.
- Application of the combined CRISPR-RNAi system for high-throughput genetic screening.
- Utilizing Drosophila as a model organism for experimental validation.
Main Results:
- Successful implementation of a high-throughput combinatorial gene disruption strategy.
- Identification of numerous synthetic lethal interactions with high reproducibility.
- Demonstration of conserved synthetic lethal interactions across species.
Conclusions:
- The combined CRISPR-RNAi approach offers a powerful tool for discovering synthetic lethal interactions.
- This method facilitates the elucidation of complex genetic networks.
- The identified interactions represent promising candidates for cancer drug development.
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