{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n In diverse biomedical investigations, “HRCT1” has been used in distinct contexts that underscore its multifaceted role. In studies of idiopathic pulmonary fibrosis (IPF), HRCT1 refers to the baseline high‐resolution computed tomography scan employed to quantify lung parenchymal changes (e.g., ground glass opacities, reticulations, and honeycombing) that correlate with functional decline and help assess response to antifibrotic treatment."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": " \n In contrast, in the context of sleep and neurodegenerative disorders, HRCT1 is used as an abbreviation for cerebrospinal fluid hypocretin‐1—a neuropeptide critical for sleep–wake regulation whose levels serve as an index of hypothalamic neuronal integrity in conditions such as narcolepsy spectrum disorders."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Moreover, genomic and epigenetic studies have identified HRCT1 as a candidate gene with potential contributions to disease biology. In high‐risk suicide pedigrees, HRCT1 was prioritized among membrane protein genes that may influence vulnerability to psychiatric conditions"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", and in breast cancer research in‐silico analyses of histone modification signatures have revealed deregulated expression patterns of HRCT1, suggesting its involvement in miRNA–mRNA regulatory networks that can impact oncogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Thus, while “HRCT1” in the imaging setting functions as an essential time‐point marker for assessing fibrotic changes in lung disease, as a biological molecule it may refer either to hypocretin‐1—a key regulator of sleep—or to a gene whose altered expression is linked to neuropsychiatric and oncologic processes. The multifarious employment of the term HRCT1 across these studies highlights both the evolving methodologies in clinical imaging and the expanding repertoire of molecular biomarkers in human disease.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Elisabetta Balestro, Elisabetta Cocconcelli, Chiara Giraudo, et al. 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