Abstract
We designed a new promoter that drives transgene expression in an exclusively neuron-specific manner. The promoter of superior cervical ganglion10 (SCG10), expressed in neurons, was further modified to enhance its neuron specificity and activity by changing its length and fusing a multiple neuronal restrictive silencer element (NRSE) to its upstream or downstream regions. The promoter, which contained 2 kb original promoter length and two extra NRSEs in its downstream region, eventually exhibited remarkable neuron specificity as well as strong activity. To further amplify the promoter activity, the promoter was introduced into a Cre recombinase (Cre)-expressing adenovirus, and subsequent combination with Cre-inducible enhanced green fluorescence protein (EGFP)-expressing adenovirus vector, which has much stronger general promoter, resulted in a remarkably strong gene expression exclusively in neuronal cells of mixed cultures and in an animal model. This system is also applicable to astrocyte-specific expression; for instance, by changing the Cre promoter cassette to an astrocyte-specific promoter. The present relatively compact promoter combined with Cre/loxP system could be useful for a wide range of transgene experiments in vivo as well as for clinical applications.
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Acknowledgements
We thank Drs I Saito and Y Kanegae (University of Tokyo, Japan) for the adenovirus transfer vectors (pAxAwNCre, pAxCALNLw), Dr J Miyazaki (Osaka University, Japan) for the CAG promoter, Dr N Mori (Nagasaki University, Japan) for SCG10 promoter plasmids, Dr K Ikenaka (National Institute for Physiological Science, Japan) for the GFAP promoter plasmid, Dr JG Sutcliffe (The Scripps Research Institute, USA) for NSE promoter plasmid, Dr S Kugler (University of Tübingen, Germany) for Synapsin 1 promoter plasmid, and Dr S Yoshida (Asahikawa Medical College) for his helpful comments for writing this manuscript. This study was supported in part by grants from MEXT.
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Supplementary Information accompanies the paper on the Gene Therapy website (http://www.nature.com/gt).
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Namikawa, K., Murakami, K., Okamoto, T. et al. A newly modified SCG10 promoter and Cre/loxP-mediated gene amplification system achieve highly specific neuronal expression in animal brains. Gene Ther 13, 1244–1250 (2006). https://doi.org/10.1038/sj.gt.3302779
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DOI: https://doi.org/10.1038/sj.gt.3302779
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