{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nProtocadherin‐15 (PCDH15) is a calcium‐dependent cell–cell adhesion molecule that plays a pivotal role in the inner ear by localizing to hair cell stereocilia and constituting an essential component of the tip‐link complex. This protein interacts with cadherin‐23 to form filamentous structures that convey mechanical forces onto mechanoelectrical transduction channels, thereby governing the elasticity and stiffness (“gating‐spring” properties) required for auditory sensation. Structural and genetic studies in both mice and humans have demonstrated that alterations in PCDH15 disrupt stereocilia bundle cohesion and morphology, resulting in various forms of hearing loss."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its indispensable role in auditory mechanotransduction, PCDH15 is critical for retinal cell function. Its expression in retinal photoreceptors underpins a role in cell maintenance, and mutations in PCDH15 are causally linked to Usher syndrome type 1F—a condition characterized by congenital profound deafness, vestibular dysfunction, and retinitis pigmentosa. Detailed genotype–phenotype studies reveal that severe loss‐of‐function mutations yield the full syndromic presentation, while hypomorphic or missense variants lead to nonsyndromic hearing loss. Moreover, complex genomic organization, alternative splicing that produces multiple cytoplasmic domain isoforms, and various deletion events contribute further to the phenotypic variability observed among patients."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "19"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its canonical roles in auditory and visual systems, emerging evidence suggests that PCDH15 variants have broader clinical and functional implications. Rare alleles have been associated with increased susceptibility to noise‐induced hearing loss, poor outcomes after cochlear implantation, and may even alter the proper positioning of other stereociliary proteins through interactions with partners such as MYO3A. Furthermore, genetic studies have implicated PCDH15 in additional processes ranging from neuropsychiatric traits and lipid metabolism to aberrant cell proliferation in glial and oncologic contexts. These diverse associations underscore the multifunctional nature of PCDH15 and highlight its significance as a therapeutic target as well as a prognostic marker in disorders affecting the sensory and central nervous systems."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "20", "end_ref": "32"}]}, {"type": "t", "text": ""}]}]}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "K N Alagramam, H Yuan, M H Kuehn, et al. 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