{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nOPN1LW encodes the long‐wavelength sensitive (red) cone opsin, a critical photopigment that initiates phototransduction in cone photoreceptors responsible for high‐acuity and color vision. Studies using expression systems and biochemical assays have demonstrated that the proper folding, chromophore binding, and spectral tuning of this protein are essential for accurate red light detection and for overall retinal function."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurther investigations have revealed the complex regulation of OPN1LW at the molecular level. Its transcription, alternative RNA splicing, gene conversion events, and interplay with regulatory elements (including thyroid hormone response elements) ensure that the opsin is expressed correctly in cone photoreceptors. In several studies, unique haplotypes and exon 3‐skipping events in OPN1LW (often considered jointly with OPN1MW in the gene cluster) were shown to disrupt normal splicing and reduce functional photopigment production, thereby perturbing normal spectral sensitivity. These molecular perturbations not only affect pigment regeneration and the subtle biophysical properties of the cones but also implicate OPN1LW in maintaining the precise cone mosaic architecture."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nClinically, aberrations in OPN1LW function, whether through point mutations, structural rearrangements, or splicing defects, have been linked to a spectrum of inherited cone dysfunction disorders, including blue cone monochromacy, Bornholm eye disease, and forms of high myopia often accompanied by red–green color vision deficiencies. Additional biophysical studies document phenomena such as altered dimerization interfaces and differences in chromophore regeneration kinetics between red cones and their counterparts, highlighting the essential role of OPN1LW in photoreceptor performance and retinal health. These insights have also led to therapeutic explorations, including gene therapy approaches and interventions to mitigate myopia progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hisao Ueyama, Shigeki Kuwayama, Hiroo Imai, et al. 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