Methods of treating diseases associated with
pathologic neuronal cells are provided. Accordingly, there is provided a method of treating a
disease associated with
pathologic neuronal cells characterized by aberrant excitability comprising: (a) administering into a first neural region of the subject a therapeutically effective amount of a
polynucleotide encoding a bistable type II
opsin attached to a
heterologous ER export
signal and / or membrane trafficking
signal which enables trafficking of said bistable type II
opsin to
axon and / or
dendrite terminals, wherein said first neural region comprises
cell bodies of said
pathologic neuronal cells; and (b) exposing a second neural region of said subject to light in a
wavelength that activates said bistable type II
opsin, wherein said second neural region comprises
axon or
dendrite terminals of said pathologic neuronal cells associated with a symptom of said
disease, and wherein said first neural region and said second neural region are distinct.