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Updated: Oct 3, 2025
Pooled CRISPR-Based Genetic Screens in Mammalian Cells
Published on: September 4, 2019
Considerations and practical implications of performing a phenotypic CRISPR/Cas survival screen
Ator Ashoti1, Francesco Limone2,3, Melissa van Kranenburg1
1Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands.
Abstract:
Genome-wide screens that have viability as a readout have been instrumental to identify essential genes. The development of gene knockout screens with the use of CRISPR-Cas has provided a more sensitive method to identify these genes. Here, we performed an exhaustive genome-wide CRISPR/Cas9 phenotypic rescue screen to identify modulators of cytotoxicity induced by the pioneer transcription factor, DUX4. Misexpression of DUX4 due to a failure in epigenetic repressive mechanisms underlies facioscapulohumeral muscular dystrophy (FHSD), a complex muscle disorder that thus far remains untreatable. As the name implies, FSHD generally starts in the muscles of the face and shoulder girdle. Our CRISPR/Cas9 screen revealed no key effectors other than DUX4 itself that could modulate DUX4 cytotoxicity, suggesting that treatment efforts in FSHD should be directed towards direct modulation of DUX4 itself. Our screen did however reveal some rare and unexpected genomic events, that had an important impact on the interpretation of our data. Our findings may provide important considerations for planning future CRISPR/Cas9 phenotypic survival screens.
Insights
This study used CRISPR/Cas9 screens to find ways to combat DUX4 toxicity, a cause of facioscapulohumeral muscular dystrophy (FSHD). Results suggest targeting DUX4 directly is key for treating FSHD.
Area of Science:
- Genetics
- Molecular Biology
- Neuroscience
Background:
- Facioscapulohumeral muscular dystrophy (FSHD) is a complex muscle disorder caused by DUX4 misexpression.
- Current treatments for FSHD are limited, highlighting the need for new therapeutic strategies.
- CRISPR-Cas9 technology offers a powerful tool for genetic screening and identifying therapeutic targets.
Purpose of the Study:
- To perform a genome-wide CRISPR/Cas9 phenotypic rescue screen to identify modulators of DUX4-induced cytotoxicity.
- To investigate potential therapeutic targets for facioscapulohumeral muscular dystrophy (FSHD).
- To understand the genetic basis of DUX4 toxicity.
Main Methods:
- Genome-wide CRISPR/Cas9 phenotypic rescue screen.
- Analysis of DUX4 cytotoxicity.
- Identification of genetic modulators of DUX4 toxicity.
Main Results:
- The screen identified DUX4 itself as the primary modulator of its own cytotoxicity.
- No other key effectors significantly modulated DUX4 cytotoxicity.
- Unexpected genomic events impacted data interpretation, offering insights for future screens.
Conclusions:
- Direct modulation of DUX4 is a promising therapeutic strategy for FSHD.
- Future CRISPR/Cas9 phenotypic survival screens should consider potential genomic event impacts.
- This study provides crucial considerations for designing effective genetic screens in disease research.
