- The gene responsible for a severe form of peripheral neuropathy and agenesis of the corpus callosum maps to chromosome 15q. Casaubon, L.K., Melanson, M., Lopes-Cendes, I., Marineau, C., Andermann, E., Andermann, F., Weissenbach, J., Prévost, C., Bouchard, J.P., Mathieu, J., Rouleau, G.A. Am. J. Hum. Genet. (1996)