Gene
therapy is an approach for human disease treatment. This is done by inserting
nucleic acids into cells to produce proteins, fix or replace damaged genes, and
inhibit expression of harmful genes.
The
gene delivery systems are classified into viral and nonviral systems. There are several advantages in nonviral
delivery systems, including biological safety (safer than viral vehicle), low
immunogenicity, ability to deliver large genes, and large scale production at a
reasonable cost.