Related Experiment Videos
Arrayed mutant haploid embryonic stem cell libraries facilitate phenotype-driven genetic screens
Guang Liu1,2, Xue Wang1,2, Yufang Liu1,2
1State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100005, China.
Nucleic Acids Research
|October 17, 2017
Summary
Researchers developed a new method for generating arrayed haploid mutant libraries in embryonic stem (ES) cells. This system enables efficient genetic screens to identify novel genes involved in cell differentiation and DNA damage response.
Area of Science:
- Genetics
- Cell Biology
- Developmental Biology
Background:
- Forward genetic screens in mammalian embryonic stem (ES) cells are powerful tools for identifying genes involved in cellular processes.
- Conducting loss-of-function screens in diploid cells is challenging due to the need for biallelic mutations.
- Previous haploid ES cell screens were limited by mixed cell pools and primarily positive selection methods, hindering negative screening and analysis of cellular interactions.
Purpose of the Study:
- To develop a method for rapidly generating arrayed haploid mutant libraries in ES cells.
- To enable efficient negative and positive genetic screens in haploid ES cells.
- To identify novel genes regulating ES cell differentiation and DNA double-strand break sensitivity.
Main Methods:
- Generation of arrayed haploid mutant libraries with a high proportion (up to 85%) of homozygous mutant clones.
- Screening of thousands of individual mutant clones using both positive and negative selection strategies.
- Application of the system to identify factors involved in ES cell differentiation and mutations conferring sensitivity to doxorubicin-induced DNA double-strand breaks.
Main Results:
- Successful generation of arrayed haploid mutant libraries enabling high-throughput screening.
- Identification of novel genes essential for the initiation of ES cell differentiation.
- Discovery of mutations that increase cellular sensitivity to DNA double-strand breaks induced by doxorubicin.
Conclusions:
- The developed method for arrayed haploid mutant libraries significantly enhances the efficiency and scope of genetic screens in mammalian ES cells.
- This system is valuable for discovering genes involved in fundamental cellular processes like differentiation and DNA repair.
- The arrayed format facilitates both positive and negative selection screens, overcoming limitations of previous pooled screening approaches.