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• W3201547415 abstract "Abstract Vertebrate photoreceptors contain large numbers of closely-packed mitochondria which sustain the high metabolic demands of these cells. These mitochondria populations are dynamic and undergo fusion and fission events. This activity serves to maintain the population in a healthy state. In the event of mitochondrial damage, sub-domains, or indeed whole mitochondria, can be degraded and population homeostasis achieved. If this process is overwhelmed cell death may result. Death of photoreceptors contributes to loss of vision in aging individuals and is associated with many eye diseases. In this study we used serial block face scanning electron microscopy of adult ( Macaca fascicularis ) retinae to examine the 3D structure of mitochondria in rod and cone photoreceptors. Healthy-looking photoreceptors contain mitochondria with a range of shapes which are associated with different regions of the cell. In some photoreceptors we observe mitochondrial swelling and other changes we associate with stress or degeneration of the cell. In both rods and cones we identify elongated domains of mitochondria with densely-packed normal cristae associated with photoreceptor ciliary rootlet bundles. We observe mitochondrial fission and mitochondrion fragments localised to these domains. Swollen mitochondria with few intact cristae are located towards the periphery of the photoreceptor inner-segment in rods, whilst they are found throughout the cell in cones. Swollen mitochondria exhibit sites on the mitochondrial inner membrane which have undergone complex invagination resulting in membranous, electron-dense aggregates. Membrane contact occurs between the mitochondrion and the photoreceptor plasma membrane in the vicinity of these aggregates, and a series of subsequent membrane fusions results in expulsion of the mitochondrial aggregate from the photoreceptor. These events are primarily associated with rods, likely reflecting the ageing mechanism in primates where many rods die but cones do not. Possible consequences of this atypical mitochondrial degradation are discussed." @default.
• W3201547415 created "2021-09-27" @default.
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• W3201547415 date "2021-06-03" @default.
• W3201547415 modified "2023-10-18" @default.
• W3201547415 title "The 3D organisation of mitochondria in primate photoreceptors" @default.
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• W3201547415 doi "https://doi.org/10.1101/2021.06.03.446914" @default.
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