Regulation of epileptogenesis by the transcriptional repressor REST

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DESCRIPTION (provided by applicant): Status epilepticus (SE) in man and rodents can produce cognitive deficits and trigger a series of molecular and cellular events that eventually culminate in the appearance of spontaneous seizures, i.e., epilepsy. An early event in this process appears to be engaged by the transcriptional repressor, REST. Our hypothesis, supported by preliminary evidence, is that REST induction by status epilepticus regulates many aspects of epileptogenesis, including neurodegeneration, cognitive impairments, neurogenesis and the development of spontaneous seizures. Specific aims are 1) To identify the principal set of genes expressed by dentate granule cells that are directly regulated by REST after SE, and to compare the effect of conditional mutation of HDAC2 and G9a, and inhibition of class I HDACs, G9a histone methyltransferase and LSD1/SMCX histone demethylase, on their SE-induced, REST-mediated transcriptional profile. 2) To determine whether conditional mutation of REST in a subset of forebrain neurons blunts the neurodegeneration, cognitive deficits, and neurogenesis that occur after SE. 3) To compare the ability of conditional mutation of REST and (depending on the outcome of aim 1) conditional mutation or post-SE inhibition of HDAC2, G9a, and LSD1, to reduce the development of epilepsy after SE. A comparison of the pilocarpine and kainate SE models will be done to minimize model-specific conclusions. Both genetic and pharmacologic approaches will be used to pursue these aims. Strategies will involve conditional mutations of REST, HDAC2 and G9a, together with selective inhibitors of the REST epigenetic effector enzymes.