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Human Molecular Genetics, 2000, Vol. 9, No. 12 1873-1879
© 2000 Oxford University Press

Retinoschisin, the X-linked retinoschisis protein, is a secreted photoreceptor protein, and is expressed and released by Weri–Rb1 cells

Celene Grayson, Silvia N.M. Reid1, Juliet A. Ellis, Adam Rutherford2, Jane C. Sowden2, John R.W. Yates, Debora B. Farber1 and Dorothy Trump+

Department of Medical Genetics, The Wellcome Trust Centre for Molecular Mechanisms in Disease, Cambridge Institute for Medical Research, University of Cambridge, Addenbrookes Hospital, Hills Road, Cambridge CB2 2QQ, UK, 1Jules Stein Institute, UCLA School of Medicine, Los Angeles, CA, USA and 2Developmental Biology Unit, Institute of Child Health, University College London, London, UK

X-linked retinoschisis is characterized by microcystic-like changes of the macular region and schisis within the inner retinal layers, leading to visual deterioration in males. Many missense and protein-truncating mutations of the causative gene RS1 have now been identified and are thought to be inactivating. RS1 encodes a 224 amino acid protein, retinoschisin, which contains a discoidin domain but is of unknown function. We have generated a polyclonal antibody against a peptide from a unique region within retinoschisin, which detects a protein of ~28 kDa in retinal samples reduced with dithiothreitol, but multimers sized >40 kDa under non-reducing conditions. A screen of human tissues with this antibody reveals retinoschisin to be retina specific and the antibody detects a protein of similar size in bovine and murine retinae. We investigated the expression pattern in the retina of both RS1 mRNA (using in situ hybridization with riboprobes) and retinoschisin (using immunohistochemistry). The antisense riboprobe detected RS1 mRNA only in the photoreceptor layer but the protein product of the gene was present both in the photoreceptors and within the inner portions of the retina. Furthermore, differentiated retinoblastoma cells (Weri–Rb1 cells) were found to express RS1 mRNA and to release retinoschisin. These results suggest that retinoschisin is released by photo­receptors and has functions within the inner retinal layers. Thus, X-linked retinoschisis is caused by abnormalities in a putative secreted photoreceptor protein and is the first example of a secreted photo­receptor protein associated with a retinal dystrophy.

+ To whom correspondence should be addressed. Tel: +44 1223 331139; Fax: +44 1223 331206; Email: dorothy.trump@cimr.cam.ac.uk


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