We propose to study the impact of loss-of-function mutations of human DNA DSB (double-strand break) repair genes on rAAV (recombinant adeno-associated virus) vector integration. rAAV vectors have two powerful applications and they are in wide use in gene therapy studies. First, they can be used to deliver transgenes to cells. This aspect of rAAV, however, is plagued by the same insertional mutagenesis problems associated with other vectors. A second application for rAAV, however, is the recombination of the vector genome with its cognate homologous chromosomal sequences (aka, gene targeting) using HR (homologous recombination), which is a highly desirable outcome for basic researchers in need of tools to modify the genome and of great utility to gene therapists. However, because NHEJ (non-homologous end joining - the major pathway for DNA DSB repair - predominates in human cells over HR, random rAAV integration events generally occur much more frequently than correct gene targeting events. Therefore, therapeutic inactivation of the NHEJ pathway should augment rAAV-mediated gene targeting and - reciprocally - inactivation of the HR pathway should hinder rAAV gene targeting. In recently published work and in unpublished data we have demonstrated that reducing certain NHEJ factors does indeed increase the frequency of rAAV-mediated gene targeting. In this application we propose to extend this work to other NHEJ factors and to HR-regulated integrations. Moreover, we propose models - and experiments designed to test them - that should illuminate the mechanism that rAAV uses for gene targeting.

Public Health Relevance

Recombinant adeno-associated virus is one of the most promising vectors for gene therapy. We have discovered a way to enhance the utility of this virus by modifying the status of DNA repair genes within human somatic cells. The reduction in expression of certain DNA repair genes elevates the frequencies with which recombinant adeno- associated virus performs gene targeting. The enhanced ability to perform gene therapy is clearly relevant to the mission of NIH.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM088351-04
Application #
8434196
Study Section
Special Emphasis Panel (ZRG1-TAG-M (01))
Program Officer
Janes, Daniel E
Project Start
2010-03-15
Project End
2014-02-28
Budget Start
2013-03-01
Budget End
2014-02-28
Support Year
4
Fiscal Year
2013
Total Cost
$273,758
Indirect Cost
$87,465
Name
University of Minnesota Twin Cities
Department
Biochemistry
Type
Schools of Arts and Sciences
DUNS #
555917996
City
Minneapolis
State
MN
Country
United States
Zip Code
55455
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