Completion of human genome project has generated a wealth of information that help in finding out new therapeutic targets. Nucleic acids play the role of new drug for the diseases,of which a genetic basic is known. Thus gene delivery could be exploited to correct missing gene,replace defective gene,or down-regulate aberrant gene expressions. Efficient delivery of nucleic acids into target cell however, continues to be a major impediment for the success of gene therapy.There are mainly two classes of vehicles for gene delivery viral and nonviral vectors.Viral vectors,however,suffer from major disadvantages like adverse immunogenic reaction, insertional mutagenesis, and sometimes fatal toxicity that limit their use in clinical trials. Nonviral vectors, on the other hand, consist of positively charged polymers peptides,or lipids that form self-assemblies with dna.While these non viral vector have the advantages of high dna. carrying capacity, ease of preparation,and lower immunogenicity and cytotoxicity,many of them are not nearly as efficient as viral vector
Completion of human genome project has generated a wealth of information that help in finding out new therapeutic targets. Nucleic acids play the role of new drug for the diseases,of which a genetic basic is known. Thus gene delivery could be exploited to correct missing gene,replace defective gene,or down-regulate aberrant gene expressions. Efficient delivery of nucleic acids into target cell however, continues to be a major impediment for the success of gene therapy.There are mainly two classes of vehicles for gene delivery viral and nonviral vectors.Viral vectors,however,suffer from major disadvantages like adverse immunogenic reaction, insertional mutagenesis, and sometimes fatal toxicity that limit their use in clinical trials. Nonviral vectors, on the other hand, consist of positively charged polymers peptides,or lipids that form self-assemblies with dna.While these non viral vector have the advantages of high dna. carrying capacity, ease of preparation,and lower immunogenicity and cytotoxicity,many of them are not nearly as efficient as viral vector
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