Harmonin (Ush1c) is required in zebrafish Müller glial cells for photoreceptor synaptic development and function

Author:

Phillips Jennifer B.1,Blanco-Sanchez Bernardo1,Lentz Jennifer J.23,Tallafuss Alexandra1,Khanobdee Kornnika4,Sampath Srirangan2,Jacobs Zachary G.1,Han Philip F.1,Mishra Monalisa4,Titus Tom A.1,Williams David S.45,Keats Bronya J.2,Washbourne Philip1,Westerfield Monte1

Affiliation:

1. Institute of Neuroscience, University of Oregon, Eugene, OR 97403-1254, USA

2. Department of Genetics, LSU Health Sciences Center, New Orleans, LA 70112, USA

3. Neuroscience Center, LSU Health Sciences Center, New Orleans, LA 70112, USA

4. Department of Pharmacology and Neuroscience, UCSD, La Jolla, CA 92093-0636, USA

5. Jules Stein Eye Institute, UCLA, Los Angeles, CA 90095-7000, USA

Abstract

SUMMARY Usher syndrome is the most prevalent cause of hereditary deaf-blindness, characterized by congenital sensorineural hearing impairment and progressive photoreceptor degeneration beginning in childhood or adolescence. Diagnosis and management of this disease are complex, and the molecular changes underlying sensory cell impairment remain poorly understood. Here we characterize two zebrafish models for a severe form of Usher syndrome, Usher syndrome type 1C (USH1C): one model is a mutant with a newly identified ush1c nonsense mutation, and the other is a morpholino knockdown of ush1c. Both have defects in hearing, balance and visual function from the first week of life. Histological analyses reveal specific defects in sensory cell structure that are consistent with these behavioral phenotypes and could implicate Müller glia in the retinal pathology of Usher syndrome. This study shows that visual defects associated with loss of ush1c function in zebrafish can be detected from the onset of vision, and thus could be applicable to early diagnosis for USH1C patients.

Publisher

The Company of Biologists

Subject

General Biochemistry, Genetics and Molecular Biology,Immunology and Microbiology (miscellaneous),Medicine (miscellaneous),Neuroscience (miscellaneous)

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