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© Research
Publication : Comptes rendus biologies

The retinal phenotype of Usher syndrome: pathophysiological insights from animal models

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Comptes rendus biologies - 20 Mar 2014

El-Amraoui A, Petit C

Link to Pubmed [PMID] – 24702843

C. R. Biol. 2014 Mar;337(3):167-77

The Usher syndrome (USH) is the most prevalent cause of inherited deaf-blindness. Three clinical subtypes, USH1-3, have been defined, and ten USH genes identified. The hearing impairment due to USH gene defects has been shown to result from improper organisation of the hair bundle, the sound receptive structure of sensory hair cells. In contrast, the cellular basis of the visual defect is less well understood as this phenotype is absent in almost all the USH mouse models that faithfully mimic the human hearing impairment. Structural and molecular interspecies discrepancies regarding photoreceptor calyceal processes and the association with the distribution of USH1 proteins have recently been unravelled, and have led to the conclusion that a defect in the USH1 protein complex-mediated connection between the photoreceptor outer segment and the surrounding calyceal processes (in both rods and cones), and the inner segment (in rods only), probably causes the USH1 retinal dystrophy in humans.

http://www.ncbi.nlm.nih.gov/pubmed/24702843