Journal Article

Retinal degeneration associated with <i>RDH12</i> mutations results from decreased 11-<i>cis</i> retinal synthesis due to disruption of the visual cycle

Debra A. Thompson, Andreas R. Janecke, Jessica Lange, Kecia L. Feathers, Christian A. Hübner, Christina L. McHenry, David W. Stockton, Gabriele Rammesmayer, James R. Lupski, Guillermo Antinolo, Carmen Ayuso, Montserrat Baiget, Peter Gouras, John R. Heckenlively, Anneke den Hollander, Samuel G. Jacobson, Richard A. Lewis, Paul A. Sieving, Bernd Wissinger, Suzanne Yzer, Eberhart Zrenner, Gerd Utermann and Andreas Gal

in Human Molecular Genetics

Volume 14, issue 24, pages 3865-3875
Published in print December 2005 | ISSN: 0964-6906
Published online November 2005 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddi411
Retinal degeneration associated with RDH12 mutations results from decreased 11-cis retinal synthesis due to disruption of the visual cycle

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Retinoid dehydrogenases/reductases catalyze key oxidation–reduction reactions in the visual cycle that converts vitamin A to 11-cis retinal, the chromophore of the rod and cone photoreceptors. It has recently been shown that mutations in RDH12, encoding a retinol dehydrogenase, result in severe and early-onset autosomal recessive retinal dystrophy (arRD). In a cohort of 1011 individuals diagnosed with arRD, we have now identified 20 different disease-associated RDH12 mutations, of which 16 are novel, in a total of 22 individuals (2.2%). Haplotype analysis suggested a founder mutation for each of the three common mutations: p.L99I, p.T155I and c.806_810delCCCTG. Patients typically presented with early disease that affected the function of both rods and cones and progressed to legal blindness in early adulthood. Eleven of the missense variants identified in our study exhibited profound loss of catalytic activity when expressed in transiently transfected COS-7 cells and assayed for ability to convert all-trans retinal to all-trans retinol. Loss-of-function appeared to result from decreased protein stability, as expression levels were significantly reduced. For the p.T49M variant, differing activity profiles were associated with each of the alleles of the common p.R161Q RDH12 polymorphism, suggesting that genetic background may act as a modifier of mutation effect. A locus (LCA3) for Leber congenital amaurosis, a severe, early-onset form of arRD, maps close to RDH12 on chromosome 14q24. Haplotype analysis in the family in which LCA3 was mapped excluded RDH12 as the LCA3 gene and thus suggests the presence of a novel arRD gene in this region.

Journal Article.  7040 words.  Illustrated.

Subjects: Genetics and Genomics

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