- A gene (SRPX) encoding a sushi-repeat-containing protein is deleted in patients with X-linked retinitis pigmentosa. Meindl, A., Carvalho, M.R., Herrmann, K., Lorenz, B., Achatz, H., Lorenz, B., Apfelstedt-Sylla, E., Wittwer, B., Ross, M., Meitinger, T. Hum. Mol. Genet. (1995)