Cited by 23Animal Genetics and ReproductionVirus-based gene therapy researchCRISPR and Genetic Engineering

Modified GFAP promoter auto-regulates tet-activator expression for increased transactivation and reduced tTA-associated toxicity

Barton, Michael D., Dunlop, J.W., Psaltis, G., Kulik, J., DeGennaro, L., Kwak, Seung P.·2002·Molecular Brain Research

Abstract

Transactivator tTA is a necessary component of the tetracycline-regulated inducible gene system. While several transgenic animals have been described that express tTA in the central nervous system (CNS), their tTA levels are often limited, presumably due to toxic effects. We evaluated methods for auto-regulating tTA levels in astrocytes by modifying the transgenic promoter human GFAP (hGFAP). The hGFAP promoter carrying a single copy of the tet-operon in place of a native enhancer element (GFAPtetO1) drove expression of tTA at low levels during un-stimulated, basal condition. However the same promoter auto-induced expression of tTA to significant levels after tetracycline withdrawal. Glial cell-specificity of the promoter remained uncompromised during both basal and induced conditions. Transgenic rats were developed using the auto-inducible GFAPtetO1 promoter that expressed tTA mRNA to high levels in the brain. Expression was widespread within the CNS but enriched in astrocyte-rich regions including the cerebellum. Primary cerebellar astrocytes from GFAPtetO1 rats transfected with 07LacZ produced substantially greater inducibility of reporter gene compared to GFAP-tTA transgenic rats. Finally, GFAPtetO1 rats exhibited severe motor/gait deficit when bred to homozygosity. This phenotype was attributable to developmental abnormalities of the cerebellum and was completely abrogated by doxycycline administration. These results suggest that developmental toxicity resulting from tTA…

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Crossref · 10.1016/s0169-328x(02)00170-5

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  • The severity of toxic side-effects of tTA and rtTA depends on the genetic background of the animal and possibly also on the (r)tTA version used.

    “The severity of these effects depends on the genetic background of the animal and possibly also on the (r)tTA version used.”

    From Tet-On Systems For Doxycycline-inducible Gene Expression (2016) · cites this paper as [80]

  • In transgenic mice, toxic side-effects of tTA and rtTA have been reported.

    “In transgenic mice, toxic side-effects of tTA and rtTA have also been reported [79-83].”

    From Tet-On Systems For Doxycycline-inducible Gene Expression (2016) · cites this paper as [80]

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Authors
Barton, M. D., Dunlop, J. W., Psaltis, G., Kulik, J., DeGennaro, L., & Kwak, S. P.
Venue
Molecular Brain Research
Publisher
Elsevier BV
Published
2002-05
Volume
101
Issue
1-2
Pages
71-81
ISSN
0169-328X (ISSN-L)
OpenAlex
W2094382378
Cited by
23
References
25
Citations by year
2017: 2 · 2016: 2 · 2015: 1 · 2014: 3 · 2013: 1 · 2012: 1
FWCI
1.06
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Animal Genetics and Reproduction
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
Keywords
TTA, GFAP promoter, autoregulation, astrocytes, cerebellum, transgenic rats, developmental toxicity, motor impairment, doxycycline, inducible gene expression, tissue-specific gene expression, central nervous system
MeSH terms
Animals, Animals, Newborn, Astrocytes, Ataxia, Cell Line, Transformed, Central Nervous System, Enhancer Elements, Genetic, Female, Glial Fibrillary Acidic Protein, Homeostasis, Male, Nervous System Malformations, Phenotype, Promoter Regions, Genetic, Repressor Proteins, RNA, Messenger, Transcriptional Activation, Trans-Activators, Cell Death, Rats, Sprague-Dawley, Gene Expression Regulation, Developmental, Animals, Genetically Modified, Rats

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