Recessive Mutations in Cause Isolated and Syndromic Optic Neuropathies

Autosomal-recessive optic neuropathies are rare blinding conditions related to retinal ganglion cell (RGC) and optic-nerve degeneration, for which only mutations in TMEM126A and ACO2 are known. In four families with early-onset recessive optic neuropathy, we identified mutations in RTN4IP1, which encodes a mitochondrial ubiquinol oxydo-reductase. RTN4IP1 is a partner of RTN4 (also known as NOGO), and its ortholog Rad8 in C. elegans is involved in UV light response. Analysis of fibroblasts from affected individuals with a RTN4IP1 mutation showed loss of the altered protein, a deficit of mitochondrial respiratory complex I and IV activities, and increased susceptibility to UV light.

Source: The American Journal of Human Genetics - October 22, 2015 Category: Genetics & Stem Cells Authors: Claire Angebault, Pierre-Olivier Guichet, Yasmina Talmat-Amar, Majida Charif, Sylvie Gerber, Lucas Fares-Taie, Naig Gueguen, François Halloy, David Moore, Patrizia Amati-Bonneau, Gael Manes, Maxime Hebrard, Béatrice Bocquet, Mélanie Quiles, Camille Pir Tags: Report Source Type: research