- The Epsin 4 gene on chromosome 5q, which encodes the clathrin-associated protein enthoprotin, is involved in the genetic susceptibility to schizophrenia. Pimm, J., McQuillin, A., Thirumalai, S., Lawrence, J., Quested, D., Bass, N., Lamb, G., Moorey, H., Datta, S.R., Kalsi, G., Badacsonyi, A., Kelly, K., Morgan, J., Punukollu, B., Curtis, D., Gurling, H. Am. J. Hum. Genet. (2005)