CRISPR Interference Efficiently Induces Specific and Reversible Gene Silencing in Human iPSCs

Area of Science:

• Stem Cell Biology
• Molecular Biology
• Gene Regulation

Background:

• Efficient and scalable gene expression disruption is crucial for understanding gene function, developmental biology, and disease mechanisms.
• Human induced pluripotent stem cells (iPSCs) are a valuable model system for studying human development and disease.

Purpose of the Study:

• To develop and characterize a clustered regularly interspaced short palindromic repeat interference (CRISPRi) system for efficient and tunable gene repression in human iPSCs.
• To evaluate the efficacy and specificity of CRISPRi in various iPSC-derived cell types.

Main Methods:

• Development of a doxycycline-inducible CRISPRi system by fusing deactivated Cas9 to a KRAB repression domain.
• Application of the CRISPRi system in human iPSCs and their differentiated progeny, including cardiac progenitors, cardiomyocytes, and T lymphocytes.
• Comparison of CRISPRi efficiency and homogeneity with CRISPR nuclease (CRISPRn) systems.

Main Results:

• CRISPRi specifically and reversibly inhibited gene expression in iPSCs and iPSC-derived cells.
• The CRISPRi system demonstrated tunable gene repression, with potential for single-allele silencing.
• CRISPRi exhibited higher efficiency and homogeneity compared to CRISPRn across cell populations.

Conclusions:

• The developed CRISPRi system provides a powerful and versatile platform for gene repression in human iPSCs.
• This technology enables genome-scale screens, dissection of developmental pathways, and modeling of diseases using iPSC-derived cells.