What is transfection? - Polyplus transfection

Learn that transfection is a technique used to introduce foreign genetic material into cells for studying gene expression and protein function in vitro and in vivo models.

Recognize that nucleic acids are negatively charged and repelled by the negatively charged cell membrane, requiring transfection to overcome this barrier.

Review microinjection and electroporation as physical methods, and transduction as a virus-based approach, noting their drawbacks including precision requirements, cell death, and biosafety concerns.

Understand how engineered positively charged polymers encapsulate negatively charged DNA into nanoparticles that interact with the cell membrane and trigger endocytic uptake.

Learn how endosomal escape allows the polymer-DNA complex to release DNA in the cytosol, which then enters the nucleus for transcription and translation using cellular machinery.

Identify that transfection can deliver DNA and RNA molecules (mRNA, siRNA, guide RNA) for both gain-of-function studies via overexpression and loss-of-function studies via knockdown or genome editing.

Summarize that chemical-based transfection is the easiest method offering superior efficiency, ease of use, reproducibility, and cost-effectiveness compared to alternative approaches.