{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNSDHL encodes a critical C‐3 sterol dehydrogenase that functions in the post‐squalene cholesterol biosynthetic pathway by catalyzing the removal of C-4 methyl groups from sterol intermediates. This enzyme is predominantly localized to the endoplasmic reticulum, yet studies have demonstrated a novel and functionally significant association with lipid droplets—ER‐derived organelles that harbor a neutral lipid core. Trafficking via the Golgi apparatus appears necessary for maintaining NSDHL’s ER localization, suggesting that its dual compartmentalization might regulate intracellular cholesterol homeostasis by modulating both biosynthetic activity and lipid storage."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n\nIn addition to its metabolic role, mutations in NSDHL elicit a spectrum of developmental disorders. Loss-of-function variants have been associated with congenital hemidysplasia with ichthyosiform nevus and limb defects (CHILD syndrome) as well as with intellectual disability syndromes such as CK syndrome. In affected patients, aberrant NSDHL function disrupts cholesterol biosynthesis, leading to an accumulation of methyl sterol intermediates despite normal circulating cholesterol levels. These observations, together with detailed expression analyses in human and murine tissues, underscore the enzyme’s vital contribution to developmental processes, particularly in tissues synthesizing cholesterol and steroids."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "8"}]}, {"type": "t", "text": "\n\nEmerging evidence also implicates NSDHL in oncogenesis. In cancers such as breast carcinoma, the biosynthetic machinery for cholesterol is typically upregulated, and NSDHL has been found to influence not only cholesterol production but also epidermal growth factor receptor (EGFR) trafficking—thereby impacting tumor growth and metastatic potential. Structural studies resolving the human NSDHL crystal structure have further enabled the identification of novel inhibitors that suppress its activity, enhancing the antitumor effects of EGFR-targeted therapies. These findings suggest that NSDHL represents a promising therapeutic target in malignancies driven by dysregulated lipid metabolism."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "12"}]}, {"type": "t", "text": "\n\nAdditional experimental insights have been garnered through studies employing both patient-derived mutations and RNA interference approaches. Investigations in lesions such as verruciform xanthoma and in model systems using stable NSDHL knockdown have shed light on the enzyme’s role in maintaining cholesterol biosynthesis under diverse cellular conditions, including temperature-sensitive protein stability and effects on placental development. Furthermore, observations linking NSDHL expression in developing cortical neurons and glia hint at a broader role for this enzyme in neurodevelopmental disorders, including autism spectrum disorder."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hugo Caldas, Gail E Herman "}, {"type": "b", "children": [{"type": "t", "text": "NSDHL, an enzyme involved in cholesterol biosynthesis, traffics through the Golgi and accumulates on ER membranes and on the surface of lipid droplets."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Mol Genet (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/hmg/ddg321"}], "href": "https://doi.org/10.1093/hmg/ddg321"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "14506130"}], "href": "https://pubmed.ncbi.nlm.nih.gov/14506130"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Masato Ohashi, Noboru Mizushima, Yukiko Kabeya, et al. 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