Adeno-Associated Virus Virions for Treatment of Epilepsy

Provided is a novel gene therapy means for neurological diseases including epilepsy. The present invention provides: a recombinant adeno-associated virus vector for use in the treatment of neurological diseases including epilepsy, which comprises a polynucleotide encoding a protein capable of improving the excitation-inhibiting function of an inhibitory synapse in vivo, preferably neuroligin-2 protein; a pharmaceutical composition comprising said recombinant vector; and others. The present invention also provides a method for treating a disease such as epilepsy using the recombinant vector.