title: 1,5-isoquinolinediol increases the frequency of gene targeting by homologous recombination in mouse fibroblasts.
abstract: Gene targeting is a technique that allows the introduction of predefined alterations into chromosomal DNA. It involves a homologous recombination reaction between the targeted genomic sequence and an exogenous targeting vector. In theory, gene targeting constitutes the ideal method of gene therapy for single gene disorders. In practice, gene targeting remains extremely inefficient for at least two reasons: very low frequency of homologous recombination in mammalian cells and high proficiency of the mammalian cells to randomly integrate the targeting vector by illegitimate recombination. One known method to improve the efficiency of gene targeting is inhibition of poly(ADP-ribose)polymerase (PARP). It has been shown that PARP inhibitors, such as 3-methoxybenzamide, could lower illegitimate recombination, thus increasing the ratio of gene targeting to random integration. However, the above inhibitors were reported to decrease the absolute frequency of gene targeting. Here we show that treatment of mouse Ltk cells with 1,5-isoquinolinediol, a recent generation PARP inhibitor, leads to an increase up to 8-fold in the absolute frequency of gene targeting in the correction of the mutation at the stable integrated HSV tk gene.
authors.affiliation: Department of Oncology, Montreal General Hospital/McGill University, Oncozyme Pharma Inc., 1650 Cedar Ave., Montreal, QC H3G 1A4, Canada.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Semionov
authors.forename: Denis
authors.initials: D
authors.lastname: Cournoyer
authors.forename: Terry Y K
authors.initials: TY
authors.lastname: Chow
mesh_terms: D000818:Animals; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000235:genetics; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D018390:Gene Targeting / Q000379:methods*; D007546:Isoquinolines; D051379:Mice; D010957:Plasmids / Q000235:genetics; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; D011804:Quinolines / Q000494:pharmacology*; D011995:Recombination, Genetic / Q000187:drug effects*
chemical_list: D004791:Enzyme Inhibitors; D007546:Isoquinolines; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; D011804:Quinolines; C095653:1,5-dihydroxyisoquinoline