Hippocampal dentate granule cell abnormalities are thought to play a causative role in temporal lobe epilepsy, but their precise contribution has not been dissociated from coexisting pathological changes. In this issue of Neuron, Pun et al. (2012) show, for the first time, that inducing proexcitatory changes in a subset of DGCs in isolation is sufficient to cause epilepsy in a rodent.
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