title: Targeted gene insertion for molecular medicine.
abstract: Genomic insertion of a functional gene together with suitable transcriptional regulatory elements is often required for long-term therapeutical benefit in gene therapy for several genetic diseases. A variety of integrating vectors for gene delivery exist. Some of them exhibit random genomic integration, whereas others have integration preferences based on attributes of the targeted site, such as primary DNA sequence and physical structure of the DNA, or through tethering to certain DNA sequences by host-encoded cellular factors. Uncontrolled genomic insertion bears the risk of the transgene being silenced due to chromosomal position effects, and can lead to genotoxic effects due to mutagenesis of cellular genes. None of the vector systems currently used in either preclinical experiments or clinical trials displays sufficient preferences for target DNA sequences that would ensure appropriate and reliable expression of the transgene and simultaneously prevent hazardous side effects. We review in this paper the advantages and disadvantages of both viral and non-viral gene delivery technologies, discuss mechanisms of target site selection of integrating genetic elements (viruses and transposons), and suggest distinct molecular strategies for targeted gene delivery.
authors.affiliation: Max Delbrück Center for Molecular Medicine, Robert-Rössle Strasse 10, 13092, Berlin, Germany.
authors.forename: Katrin
authors.initials: K
authors.lastname: Voigt
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Izsvák
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Ivics
mesh_terms: D000818:Animals; D004251:DNA Transposable Elements; D018014:Gene Transfer Techniques; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors / Q000009:adverse effects; D006801:Humans; D011993:Recombinant Fusion Proteins / Q000235:genetics; D012190:Retroviridae / Q000235:genetics
chemical_list: D004251:DNA Transposable Elements; D011993:Recombinant Fusion Proteins