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Title: Complexes of Usher proteins preassemble at the endoplasmic reticulum and are required for trafficking and ER homeostasis

Journal Article · · Disease models & mechanisms
DOI:https://doi.org/10.1242/dmm.014068· OSTI ID:1627092

Usher syndrome (USH), the leading cause of hereditary combined hearing and vision loss, is characterized by sensorineural deafness and progressive retinal degeneration. Mutations in several different genes produce USH, but the proximal cause of sensory cell death remains mysterious. We adapted a proximity ligation assay to analyze associations among three of the USH proteins, Cdh23, Harmonin and Myo7aa, and the microtubule-based transporter Ift88 in zebrafish inner ear mechano-sensory hair cells. We found that the proteins are in close enough proximity to form complexes and that these complexes preassemble at the endoplasmic reticulum (ER). Defects in any one of the three USH proteins disrupt formation and trafficking of the complex and result in diminished levels of the other proteins, generalized trafficking defects and ER stress that triggers apoptosis. ER stress, thus, contributes to sensory hair cell loss and provides a new target to explore for protective therapies for USH.

Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
OSTI ID:
1627092
Journal Information:
Disease models & mechanisms, Vol. 7, Issue 5; ISSN 1754-8403
Publisher:
The Company of Biologists
Country of Publication:
United States
Language:
English

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Cited By (13)

A Combined Multi-Cohort Approach Reveals Novel and Known Genome-Wide Selection Signatures for Wool Traits in Merino and Merino-Derived Sheep Breeds journal October 2019
Caspase-8 Regulates Endoplasmic Reticulum Stress-Induced Necroptosis Independent of the Apoptosis Pathway in Auditory Cells journal November 2019
FGFR1-mediated protocadherin-15 loading mediates cargo specificity during intraflagellar transport in inner ear hair-cell kinocilia journal July 2018
The role of retrograde intraflagellar transport genes in aminoglycoside-induced hair cell death journal January 2018
Genes and Hearing Loss: Relationship to Oxidative Stress and Free Radical Formation book January 2015
DGKδ triggers endoplasmic reticulum release of IFT88-containing vesicles destined for the assembly of primary cilia journal July 2017
Water Waves to Sound Waves: Using Zebrafish to Explore Hair Cell Biology journal January 2019
The lhfpl5 ohnologs lhfpl5a and lhfpl5b are required for mechanotransduction in distinct populations of sensory hair cells in zebrafish posted_content January 2019
Cilia-Associated Genes Play Differing Roles in Aminoglycoside-Induced Hair Cell Death in Zebrafish journal July 2016
Cilia in the developing zebrafish ear journal December 2019
Deletion of Tmtc4 activates the unfolded protein response and causes postnatal hearing loss journal September 2018
Deficiency of the ER-stress-regulator MANF triggers progressive outer hair cell death and hearing loss journal February 2020
The lhfpl5 Ohnologs lhfpl5a and lhfpl5b Are Required for Mechanotransduction in Distinct Populations of Sensory Hair Cells in Zebrafish journal January 2020

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