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Retinal Pigment Epithelial Cells: The Unveiled Component in the Etiology of Prpf Splicing Factor-Associated Retinitis Pigmentosa.

Adv. Exp. Med. Biol.2019;1185:227-231. doi:10.1007/978-3-030-27378-1_37
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摘要


Pre-mRNA splicing is a critical step in RNA processing in all eukaryotic cells. It consists of introns removal and requires the assembly of a large RNA-protein complex called the spliceosome. This complex of small nuclear ribonucleoproteins is associated with accessory proteins from the pre-mRNA processing factor (PRPF) family. Mutations in different splicing factor-encoding genes were identified in retinitis pigmentosa (RP) patients. A surprising feature of these ubiquitous factors is that the outcome of their alteration is restricted to the retina. Because of their high metabolic demand, most studies focused on photoreceptors dysfunction and associated degeneration. However, cells from the retinal pigment epithelium (RPE) are also crucial to maintaining retinal homeostasis and photoreceptor function. Moreover, mutations in RPE-specific genes are associated with some RP cases. Indeed, we identified major RPE defects in Prpf31-mutant mice: circadian rhythms of both photoreceptor outer segments (POS) phagocytosis and retinal adhesion were attenuated or lost, leading to ultrastructural anomalies and vacuoles. Taken together, our published and ongoing data suggest that (1) similar molecular events take place in human and mouse cells and (2) these functional defects generate various stress processes.

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