Efficient and stable transgene expression in human embryonic stem cells using transposon-mediated gene transfer

Area of Science:

• Stem Cell Biology
• Gene Therapy
• Molecular Biology

Background:

• Efficient genetic modification of human embryonic stem (ES) cells is crucial for their scientific and therapeutic applications.
• Current methods often rely on viral vectors, limiting nonviral approaches for stable gene insertion.

Purpose of the Study:

• To evaluate the efficacy of the nonviral Sleeping Beauty (SB) transposon system for stable gene transfer and expression in human ES cells.
• To demonstrate the potential of SB transposons for genetic manipulation of human ES cells without viral vectors.

Main Methods:

• Delivery of transposons encoding reporter genes (GFP-zeocin or luciferase) and SB transposase (via DNA or RNA) to undifferentiated human ES cells.
• Assessment of transgene expression and molecular analysis of transposon integration.
• Evaluation of stable transgene expression during in vitro differentiation and in vivo teratoma formation.

Main Results:

• Stable transgene expression was achieved in human ES cells cotransfected with transposon and transposase.
• Molecular analysis confirmed that 98% of stable gene transfer resulted from transposition.
• Engineered human ES cells maintained stable transgene expression up to 5 months and differentiated into teratomas and hematopoietic cells.

Conclusions:

• The Sleeping Beauty transposon system offers an effective nonviral strategy for genetic modification of human ES cells.
• This system facilitates durable transgene expression, supporting the potential for advanced stem cell applications.
• SB transposons present advantages for genetic manipulation and long-term gene expression in human ES cells.