Structural and molecular bases of rod photoreceptor morphogenesis and disease

Publication date: Available online 22 June 2016 Source:Progress in Retinal and Eye Research Author(s): Theodore G. Wensel, Zhixian Zhang, Ivan A. Anastassov, Jared C. Gilliam, Feng He, Michael F. Schmid, Michael A. Robichaux The rod cell has an extraordinarily specialized structure that allows it to carry out its unique function of detecting individual photons of light. Both the structural features of the rod and the metabolic processes required for highly amplified light detection seem to have rendered the rod especially sensitive to structural and metabolic defects, so that a large number of gene defects are primarily associated with rod cell death and give rise to blinding retinal dystrophies. The structures of the rod, especially those of the sensory cilium known as the outer segment, have been the subject of structural, biochemical, and genetic analysis for many years, but the molecular bases for rod morphogenesis and for cell death in rod dystrophies are still poorly understood. Recent developments in imaging technology, such as cryo-electron tomography and super-resolution fluorescence microscopy, in gene sequencing technology, and in gene editing technology are rapidly leading to new breakthroughs in our understanding of these questions. A summary is presented of our current understanding of selected aspects of these questions, highlighting areas of uncertainty and contention as well as recent discoveries that provide new insights. Examples of struct...

Source: Progress in Retinal and Eye Research - June 22, 2016 Category: Opthalmology Source Type: research