- Loss of function of the cytoplasmic isoform of the protein laforin (EPM2A) causes Lafora progressive myoclonus epilepsy. Ianzano, L., Young, E.J., Zhao, X.C., Chan, E.M., Rodriguez, M.T., Torrado, M.V., Scherer, S.W., Minassian, B.A. Hum. Mutat. (2004)