{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRPGR is a critical ciliary protein predominantly expressed in photoreceptors, where it localizes to the connecting cilium, basal bodies, and axoneme. It contains a conserved RCC1‐like domain that is thought to contribute to its function as a guanine nucleotide exchange factor, and it plays an essential role in maintaining photoreceptor integrity. Mutations in RPGR are a major cause of X‐linked retinal degenerations, ranging from classic retinitis pigmentosa to cone or cone–rod dystrophies and even syndromic forms involving ciliary defects."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, RPGR acts as a scaffold that orchestrates the assembly and regulation of multiprotein complexes implicated in ciliary transport. It interacts directly with several key partners—including RPGR-interacting protein 1 (RPGRIP1), structural maintenance proteins (SMC1/3), intraflagellar transport components such as IFT88, and small GTPases like RAB8A, for which it exhibits nucleotide exchange activity. Additionally, RPGR is involved in recruiting components that regulate microtubule dynamics and actin remodeling (for example, through gelsolin activation), thereby ensuring proper cargo trafficking (e.g. of rhodopsin) and ciliary organization in photoreceptors."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in protein trafficking and ciliary organization, RPGR is implicated in regulating the dynamic interplay between the cytoskeleton and ciliary transport, and its dysfunction gives rise to a wide spectrum of retinal and ciliary pathologies. Detailed genotype–phenotype studies have revealed that specific mutations in RPGR, particularly in the alternatively spliced ORF15 exon, lead to varied clinical presentations. These include altered interactions with proteins such as PDEδ (thereby influencing lipidated cargo delivery via Arl2/Arl3), misregulated actin dynamics through impaired gelsolin activation, and defects in the ciliary targeting of essential photoreceptor proteins. In turn, these dysfunctions contribute to abnormal cilia length, disrupted disc morphogenesis, and ultimately photoreceptor degeneration."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "50"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "S Chul Kwon, Hyerim Yi, Katrin Eichelbaum, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Mutations in RPGR and RP2 account for 15% of males with simplex retinal degenerative disease."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Invest Ophthalmol Vis Sci (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1167/iovs.12-11025"}], "href": "https://doi.org/10.1167/iovs.12-11025"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23150612"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23150612"}]}, {"type": "r", "ref": 17, "children": [{"type": "t", "text": "Jianfu Chen, Fan Lai, Lee Niswander "}, {"type": "b", "children": [{"type": "t", "text": "The ubiquitin ligase mLin41 temporally promotes neural progenitor cell maintenance through FGF signaling."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Genes Dev (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1101/gad.187641.112"}], "href": "https://doi.org/10.1101/gad.187641.112"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22508726"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22508726"}]}, {"type": "r", "ref": 18, "children": [{"type": "t", "text": "Tomas S Aleman, Artur V Cideciyan, Alexander Sumaroka, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Allelic heterogeneity and genetic modifier loci contribute to clinical variation in males with X-linked retinitis pigmentosa due to RPGR mutations."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS One (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.pone.0023021"}], "href": "https://doi.org/10.1371/journal.pone.0023021"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21857984"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21857984"}]}, {"type": "r", "ref": 24, "children": [{"type": "t", "text": "Zuzanna Bukowy-Bieryłło, Ewa Ziętkiewicz, Niki Tomas Loges, et al. 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