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Updated: Sep 16, 2025
A Data Integration Workflow to Identify Drug Combinations Targeting Synthetic Lethal Interactions
Published on: May 27, 2021
The synthetic lethal interaction between CDS1 and CDS2 is a vulnerability in uveal melanoma and across multiple tumor
Pui Ying Chan1, Diana Alexander1, Ishan Mehta1
1Wellcome Sanger Institute, Hinxton, UK.
Abstract:
Metastatic uveal melanoma is an aggressive disease with limited effective therapeutic options. To comprehensively map monogenic and digenic dependencies, we performed CRISPR-Cas9 screening in ten extensively profiled human uveal melanoma cell line models. Analysis involved genome-wide single-gene and combinatorial paired-gene CRISPR libraries. Among our 76 uveal melanoma-specific essential genes and 105 synthetic lethal gene pairs, we identified and validated the CDP-diacylglycerol synthase 2 gene (CDS2) as a genetic dependency in the context of low CDP-diacylglycerol synthase 1 gene (CDS1) expression. We further demonstrate that CDS1/CDS2 forms a synthetic lethal interaction in vivo and reveal that CDS2 knockout results in the disruption of phosphoinositide synthesis and increased cellular apoptosis and that re-expression of CDS1 rescues this cell fitness defect. We extend our analysis using pan-cancer data, confirming increased CDS2 essentiality in diverse tumor types with low CDS1 expression. Thus, the CDS1/CDS2 axis is a therapeutic target across a range of cancers.
Insights
Researchers identified a new therapeutic target for metastatic uveal melanoma and other cancers. The study found that targeting the CDS2 gene, especially when CDS1 expression is low, disrupts cancer cell survival.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Metastatic uveal melanoma presents limited therapeutic options.
- Understanding genetic dependencies is crucial for developing new treatments.
Purpose of the Study:
- To identify monogenic and digenic dependencies in uveal melanoma using CRISPR-Cas9 screening.
- To explore the therapeutic potential of identified genetic interactions across various cancers.
Main Methods:
- Genome-wide CRISPR-Cas9 screening in ten human uveal melanoma cell lines.
- Analysis of single-gene and paired-gene CRISPR libraries.
- In vivo validation of synthetic lethal interactions and gene essentiality.
Main Results:
- Identified 76 uveal melanoma-specific essential genes and 105 synthetic lethal gene pairs.
- Validated CDP-diacylglycerol synthase 2 (CDS2) as a dependency when CDP-diacylglycerol synthase 1 (CDS1) is underexpressed.
- Demonstrated CDS1/CDS2 synthetic lethality in vivo, showing CDS2 knockout disrupts phosphoinositide synthesis, increases apoptosis, and CDS1 re-expression rescues fitness.
Conclusions:
- The CDS1/CDS2 axis represents a synthetic lethal interaction and a potential therapeutic target in uveal melanoma.
- This interaction is also essential in other tumor types with low CDS1 expression, suggesting broader applicability.
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