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Human Molecular Genetics Advance Access published online on July 14, 2004
Human Molecular Genetics, doi:10.1093/hmg/ddh211
© 2004 by Oxford University Press
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Article

The R172W mutation in peripherin/rds causes a cone-rod dystrophy in transgenic mice

Xi-Qin Ding 1, May Nour 1, Linda M. Ritter 2, Andrew F.X. Goldberg 2, Steven J. Fliesler 3, Muna I. Naash 4*

1 From the Departments of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, U.S.A.
2 Eye Research Institute, Oakland University, Oakland, MI 48309, U.S.A.
3 Departments of Ophthalmology & Pharmacological and Physiological Science, Saint Louis University School of Medicine, St. Louis, MO 63104, USA
4 Department of Cell Biology, University of Oklahoma Health Sciences Center, 940 Stanton L. Young Blvd. BSMB 781, Oklahoma City, OK, 73104

* To whom correspondence should be addressed. E-mail: muna-naash{at}ouhsc.edu.


  Abstract

Peripherin/rds (P/rds) is a membrane glycoprotein essential for the photoreceptor outer segment disc morphogenesis and maintenance. More than half of the disease-causing mutations in P/rds have been linked to different forms of macular dystrophy; the most common one is substitution of tryptophan for arginine at position 172 (R172W). Here we confirm the patient phenotype associated with expression of the R172W mutation in transgenic mice. Functional, structural and biochemical analyses showed that, while R172W P/rds is appropriately localized, a direct correlation exists between transgene expression levels and the onset/severity of the phenotype. In the wildtype background, both cone and rod photoreceptor structure and function were significantly diminished, which indicates a dominant-negative, cone-rod defect. While rds+/- mice maintained the normal cone function at early ages, cone responses in R172W/rds+/- mice were diminished to 41% of the wildtype level signifying a preferential damaging effect of the mutation on cones. Conversely, R172W/rds+/- mice showed a significant rescue of rod function and improvement of rod outer segment structure. Although rds-/- mice have no detectable rod or cone responses, R172W/rds-/- animals retained 30% of wildtype structure and rod function, but no significant rescue of cone function was detected at 1-month of age. No biochemical abnormalities were observed in complex formation and association with Rom-1; however, R172W protein was more sensitive to tryptic digestion, indicative of a change in protein conformation, possibly contributing to the cone-dominated phenotype. As the first animal model for P/rds-associated cone-rod dystrophy, R172W mice provide a valuable tool for studying the pathophysiology of P/rds-associated human retinal dystrophies and the development of therapeutic strategies to intervene in these diseases.


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