Journal
HEARING RESEARCH
Volume 255, Issue 1-2, Pages 109-120Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.heares.2009.06.006
Keywords
Usher syndrome; Clarin-1; Stereocilia; Connecting cilia; Ribbon synapse
Funding
- NCRR, NIH [C06 RR17417-01]
- [R01 DC004844]
- [R01 DC 006442]
- NATIONAL CENTER FOR RESEARCH RESOURCES [C06RR017417] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS [R01DC004844, R01DC006442] Funding Source: NIH RePORTER
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The Usher syndrome 3A (CLRN1) gene encodes clarin-1, which is a member of the tetraspanin family of transmembrane proteins. Although identified more than 6 years ago, little is known about its localization or function in the eye and ear. We developed a polyclonal antibody that react with all clarin-1 isoforms and used it to characterize protein expression in cochlea and retina. In the cochlea, we observe clarin-1 expression in the stereocilia of PO mice, and in synaptic terminals present at the base of the auditory hair cells from E18 to P6. In the retina, clarin-1 localizes to the connecting cilia, inner segment of photo-receptors and to the ribbon synapses. RT-PCR from PO cochlea and P28 retina show mRNAs encoding only isoforms 2 and 3. Western blots show that only isoform 2 is present in protein extracts from these same tissues. We examined clarin-1 expression in the immortomouse-derived hair cell line UB/OC-1. Only isoform 2 is expressed in UB/OC-1 at both mRNA and protein levels, suggesting this isoform is biologically relevant to hair cell function. The protein co-localizes with microtubules and post-transgolgi vesicles. The subcellular localization of clarin-1 in hair cells and photoreceptors suggests it functions at both the basal and apical poles of neurosensoriepithelia. (C) 2009 Elsevier B.V. All rights reserved.
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