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Generation of Maternal Mutants Using zpc:cas9 Knock-in Zebrafish
Published on: July 22, 2025
423
A Time-Saving Strategy to Generate Double Maternal Mutants by an Oocyte-Specific Conditional Knockout System in
Chong Zhang1, Jiaguang Li2, Imran Tarique1
1Shandong Provincial Key Laboratory of Animal Cell and Developmental Biology and Key Laboratory for Experimental Teratology of the Ministry of Education, School of Life Sciences, Shandong University, Qingdao 266237, China.
Biology
|August 27, 2021
Summary
Researchers developed a new method to study maternal factors essential for early development. This technique enables the creation of maternal and zygotic mutant embryos, overcoming previous limitations in studying gene function.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Maternal products (mRNAs and proteins from oogenesis) are crucial for oocyte formation, fertilization, and early embryonic development.
- Studying maternal factors is challenging due to difficulties in generating maternal (M) and maternal-zygotic (MZ) mutant embryos, requiring extensive transgenerational screening.
Purpose of the Study:
- To establish a novel conditional knockout strategy for efficient generation of M and MZ mutant embryos.
- To overcome technical barriers in studying genes with multiple, functionally redundant paralogs.
Main Methods:
- Utilized a transgenic line Tg(zpc:zcas9) with oocyte-specific Cas9 expression.
- Co-expressed multiple sgRNAs targeting specific genes (dvl2 and dvl3a) simultaneously via a single construct.
- Introduced the construct into the Tg(zpc:zcas9) line using meganuclease I-Sce I.
Main Results:
- Successfully generated Mdvl2;Mdvl3a embryos exhibiting defective gastrulation (convergence and extension movements).
- Successfully generated MZdvl2;MZdvl3a embryos.
- Demonstrated the feasibility of studying genes with redundant paralogs using this method.
Conclusions:
- The developed conditional knockout strategy effectively circumvents difficulties in studying maternal factors.
- This approach facilitates the study of genes with multiple functionally redundant paralogs, advancing our understanding of early embryonic development.
