1. Loss of Motor Protein MYO1C Causes Rhodopsin Mislocalization and Results in Impaired Visual Function
- Author
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Ehtesham Arif, René Martin, Bushra Rahman, Glenn P. Lobo, Hans-Joachim Knölker, Altaf A. Kondkar, Sandra R. Montezuma, Shahid Husain, Stephen Walterhouse, Deepak Nihalani, Manas R. Biswal, and Ashish K. Solanki
- Subjects
0301 basic medicine ,Rhodopsin ,retina ,genetic structures ,QH301-705.5 ,myosin 1C ,Article ,Motor protein ,03 medical and health sciences ,Mice ,motor protein ,Myosin ,medicine ,Electroretinography ,visual function ,Animals ,Photoreceptor Cells ,Biology (General) ,Eye Proteins ,Retina ,030102 biochemistry & molecular biology ,biology ,Chemistry ,outer segments ,Dyneins ,General Medicine ,Phenotype ,photoreceptor ,eye diseases ,Cell biology ,030104 developmental biology ,medicine.anatomical_structure ,Ultrastructure ,biology.protein ,Immunohistochemistry ,sense organs ,Function (biology) - Abstract
Unconventional myosins, linked to deafness, are also proposed to play a role in retinal cell physiology. However, their direct role in photoreceptor function remains unclear. We demonstrate that systemic loss of the unconventional myosin MYO1C in mice, specifically causes rhodopsin mislocalization, leading to impaired visual function. Electroretinogram analysis of Myo1c knockout (Myo1c-KO) mice showed a progressive loss of photoreceptor function. Immunohistochemistry and binding assays demonstrated MYO1C localization to photoreceptor inner and outer segments (OS) and identified a direct interaction of rhodopsin with MYO1C. In Myo1c-KO retinas, rhodopsin mislocalized to rod inner segments (IS) and cell bodies, while cone opsins in OS showed punctate staining. In aged mice, the histological and ultrastructural examination of the phenotype of Myo1c-KO retinas showed progressively shorter photoreceptor OS. These results demonstrate that MYO1C is important for rhodopsin localization to the photoreceptor OS, and for normal visual function.
- Published
- 2021