Spatio-temporally controlled transfection by quantitative injection into a single cell

Area of Science:

• Cell Biology
• Molecular Biology
• Biotechnology

Background:

• Conventional transfection methods lack precise control over gene expression timing and quantity.
• Spatiotemporal control and accurate material delivery are crucial for advanced cellular engineering.

Purpose of the Study:

• To develop a non-viral, quantitative transfection technique for precise, single-cell gene delivery.
• To establish optimal conditions for gene delivery and expression within individual cells.
• To demonstrate the utility of this method for multi-gene expression and stem cell applications.

Main Methods:

• Quantitative injection of DNA into single cells at controlled locations and times.
• Determination of optimal DNA quantities for gene delivery and expression.
• Comparison of fluorescence intensity with polymerase chain reaction (PCR) for gene expression quantification.
• Simultaneous expression of multiple DNA genes within a single cell.

Main Results:

• An optimal condition of 1500 DNA molecules yielded approximately 30% gene expression efficiency.
• Sustained gene expression was observed for over 14 days.
• Fluorescence intensity accurately reflected gene expression levels, as validated by PCR.
• Successful co-expression of three different DNA genes in a single cell was achieved.

Conclusions:

• Spatio-temporally controlled quantitative transfection is an effective method for regulating gene expression in single cells.
• This technique shows promise for applications in stem cell research, including induced pluripotent stem (iPS) cell generation.
• The method offers precise control over gene delivery, expression levels, and timing for cellular engineering.