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Journal of Virology, October 1999, p. 8837-8842, Vol. 73, No. 10
Department of Genetics and Developmental
Biology,1 Mary Babb Randolph Cancer
Center,2 and Department of
Biochemistry,3 West Virginia University,
Morgantown, West Virginia 26506
Received 18 March 1999/Accepted 6 July 1999
Expression of the selectable drug resistance gene in retroviral
vectors used for gene therapy can lead to a decreased expression of the
gene of interest and may induce a host immune response, resulting in a
decreased efficiency of gene therapy. In this study, we demonstrate
that high-frequency deletion of direct repeats, an inherent property of
reverse transcriptases, can be used to efficiently excise the drug
resistance gene during reverse transcription. One retroviral vector
containing a direct repeat deleted the neomycin resistance expression
cassette during a single replication cycle at >99% efficiency.
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Development of Murine Leukemia Virus-Based
Self-Activating Vectors That Efficiently Delete the Selectable Drug
Resistance Gene during Reverse Transcription
*
Corresponding author. Mailing address: Mary Babb
Randolph Cancer Center, West Virginia University, Morgantown, WV 26506. Phone: (304) 293-0495. Fax: (304) 293-4667. E-mail:
VPATHAK{at}wvu.edu.
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