A method for single-cell sorting and expansion of genetically modified human embryonic stem cells.

Area of Science:

• Stem Cell Biology
• Molecular Genetics
• Developmental Biology

Background:

• Genetic modification of human embryonic stem (hES) cells is crucial for understanding gene function and differentiation pathways.
• Stable integration of transgenes is necessary for long-term studies involving multiple cell divisions and differentiation periods.

Purpose of the Study:

• To establish a reliable method for producing and expanding genetically modified hES cell lines from single cells.
• To create pluripotent hES cell lines with stable transgene expression for research applications.

Main Methods:

• Genetic modification of hES cells using lentivirus vectors.
• Isolation and expansion of single modified hES cells via fluorescence-activated cell sorting (FACS).
• Characterization of established cell lines for pluripotency, chromosomal stability, and transgene expression.

Main Results:

• Successfully generated enhanced green fluorescent protein (eGFP)-expressing hES cell lines.
• Confirmed pluripotency and diploid chromosomal content of the modified hES cell lines.
• Demonstrated stable eGFP expression for over 2 months in culture and during in vivo differentiation.

Conclusions:

• The described method provides a robust approach for generating stable, genetically modified hES cell lines.
• These modified hES cell lines are suitable for studying gene function and differentiation processes.
• The established eGFP-expressing lines facilitate identification and tracking of differentiated cell types.