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Control of parvovirus DNA replication by a tetracycline-regulated repressor

Gene Therapy volume 6, pages 309–313 (1999)Cite this article

Abstract

Autonomous parvoviruses are small, single strand DNA viruses which preferentially replicate in transformed and tumor cells, causing cell death by expression of the cytotoxic nonstructural protein, NS1. Several parvoviruses of the rodent group, including LuIII, efficiently infect human transformed cell lines. The potential for systemic use of these viruses in targeting metastases might be enhanced if NS1 expression and viral replication could be controlled by an innocuous drug such as tetracycline. We therefore substituted prokaryotic tetracycline operator sequences for part of P4 of LuIII, the promoter responsible for transcription of the mRNAs for nonstructural proteins. The resulting construct unexpectedly showed constitutive expression in transiently transfected cells, as indicated by efficient excision and amplification of viral replicative form (RF) DNA. This was apparently due to self-stimulatory transcriptional transactivation by NS1. This problem was overcome by cotransfection with a plasmid expressing a chimera of the repressor of the tetracycline operon with a KRAB transrepression domain. These conditions allowed efficient control of transcription and RF amplification by the tetracycline derivative, doxycycline. These observations form a basis for developing a therapeutic agent based on a drug- controlled parvovirus.

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  1. Department of Dermatology and University of Colorado Cancer Center and Health Sciences Center, Denver, CO, USA

    I H Maxwell & F Maxwell

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  1. I H Maxwell
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Maxwell, I., Maxwell, F. Control of parvovirus DNA replication by a tetracycline-regulated repressor. Gene Ther 6, 309–313 (1999). https://doi.org/10.1038/sj.gt.3300832

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