Germline Competent Pluripotent Mouse Stem Cells Generated by Plasmid Vectors.

Area of Science:

• Stem cell biology
• Molecular biology
• Genetics

Background:

• Induced pluripotent stem cells (iPSCs) hold promise for regenerative medicine and disease modeling.
• Efficient and reliable methods for generating iPSCs are crucial for their clinical application.

Purpose of the Study:

• To develop non-integrated methods for reprogramming mouse embryonic fibroblast (MEF) cells into iPSCs.
• To enhance the efficiency of iPSC generation using additional reprogramming factors.

Main Methods:

• Utilized a combination of pig (pOct4, pSox2, pc-Myc) and human (hKLF4, hAID, hTDG) reprogramming factors delivered via plasmid vectors.
• Compared a four-factor (4F) method with a six-factor (6F) method incorporating hAID and hTDG to assess reprogramming efficiency.

Main Results:

• The 4F method successfully generated iPSC clones with naive embryonic stem cell (ESC)-like morphology, expressing endogenous Nanog and capable of chimera generation.
• The 6F method increased reprogramming conversion efficiency approximately five-fold compared to the 4F method.
• One of the 6F plasmid-derived iPSC (piPSC) clones demonstrated germline transmission competence.

Conclusions:

• Non-integrated reprogramming using plasmid vectors is an effective strategy for generating iPSCs.
• The addition of hAID and hTDG to the standard four factors significantly enhances iPSC reprogramming efficiency.
• The developed 6F method provides a more efficient route to generate germline-competent iPSCs.