Substantial progress has been made in the development of novel gene therapy strategies for central nervous system (CNS) disorders\r\nin recent years. However, unregulated transgene expression is a significant issue limiting human applications due to the potential\r\nside effects from excessive levels of transgenic protein that indiscriminately affect both diseased and nondiseased cells. Gene\r\nregulation systems are a tool by which tight tissue-specific and temporal regulation of transgene expression may be achieved.\r\nThis review covers the features of ideal regulatory systems and summarises the mechanics of current exogenous and endogenous\r\ngene regulation systems and their utility in the CNS.
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