{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe RLBP1 gene encodes cellular retinaldehyde‐binding protein (CRALBP), a pivotal component in the visual cycle that is expressed predominantly in retinal pigment epithelial and Müller cells. CRALBP binds 11‑cis‐retinoids—such as 11‑cis‑retinol and 11‑cis‑retinal—thereby maintaining their proper configuration and ensuring their availability as critical substrates for the regeneration of visual pigments. In doing so, CRALBP not only augments the isomerase activity of RPE65, facilitating the oxidation of 11‑cis‑retinol to 11‑cis‑retinal, but also serves a protective role against potentially deleterious retinaldehyde activity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMutational analyses of RLBP1 have revealed that even subtle alterations in CRALBP structure can significantly impair its retinoid‐binding properties and, consequently, disrupt visual cycle efficiency. Studies using recombinant proteins harboring disease‐associated variants (for example, mutations such as R233W, M225K, and R234W) have demonstrated outcomes ranging from diminished solubility and abrogated retinoid binding to abnormally increased substrate affinity that impedes the timely release of 11‑cis‑retinal. Such perturbations in CRALBP function have been causally linked to a spectrum of severe retinal dystrophies—including retinitis punctata albescens, Bothnia dystrophy, and Newfoundland rod–cone dystrophy—underscoring the critical role of finely tuned retinoid interactions in retinal health."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurthermore, the broad array of retinal diseases associated with RLBP1 mutations—from retinitis punctata albescens and fundus albipunctatus to various forms of retinitis pigmentosa and even aspects of age‐related macular degeneration—underscores the clinical significance of robust CRALBP function. In addition to its central role in retinoid processing, CRALBP interacts with other visual cycle enzymes (influencing, for instance, retinol dehydrogenase activity) and is subject to transcriptional regulation by factors such as MITF. Aberrant CRALBP function can also have immunological repercussions, with autoantibodies against CRALBP identified in uveitis patients, thus broadening its impact to include potential roles in autoimmune retinal pathology."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Zhiping Wu, Yanwu Yang, Natacha Shaw, et al. 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