High-Level Precise Knockin of iPSCs by Simultaneous Reprogramming and Genome Editing of Human Peripheral Blood...

Area of Science:

• Stem cell biology
• Gene editing technologies
• Regenerative medicine

Background:

• Induced pluripotent stem cells (iPSCs) are crucial for regenerative medicine.
• Efficient generation of integration-free iPSCs and precise genome editing are key challenges.
• Previous work optimized CRISPR-Cas9 and donor systems for gene knockin.

Purpose of the Study:

• To develop a single-step method for simultaneous reprogramming and genome editing of blood cells.
• To enhance the efficiency of generating integration-free iPSCs with precise genetic modifications.
• To facilitate the clinical application of iPSC technology.

Main Methods:

• Development of a single episomal vector expressing Cas9 and KLF4.
• Integration of reprogramming factors (KLF4, SV40LT) and CRISPR-Cas9 components.
• Utilizing peripheral blood mononuclear cells for reprogramming and editing.
• Assessment of genome editing efficiency without selection.

Main Results:

• Achieved simultaneous reprogramming and genome editing in a single step.
• Demonstrated significantly increased genome editing efficiency using a single vector for Cas9 and KLF4.
• Observed up to 40% genome editing efficiency in the bulk iPSC population without selection.
• Confirmed that most edited cells exhibited iPSC characteristics and genome integrity.

Conclusions:

• The integrated approach streamlines the generation of precisely edited, integration-free iPSCs.
• This method significantly enhances efficiency, potentially reducing costs and time for iPSC applications.
• The optimized protocol is poised to accelerate basic research and clinical translation in precision and regenerative medicine.