{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSGMS1, which encodes sphingomyelin synthase 1 (SMS1), is the key enzyme responsible for catalyzing the transfer of a phosphorylcholine group from phosphatidylcholine to ceramide to form sphingomyelin (SM) and diacylglycerol (DAG). This fundamental activity regulates ceramide levels—a lipid with important roles in apoptosis—and generates DAG, a bioactive mediator that influences cell proliferation and survival. Detailed cloning and molecular studies have delineated the structure and alternative transcripts of SGMS1 (including its identification as the “MOB” gene in early reports), establishing its pivotal role in the de novo synthesis of SM in various cell types as well as its involvement in maintaining proper cellular lipid homeostasis and membrane order."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its enzymatic role, SGMS1 exerts significant influence on cellular signaling and membrane dynamics. By generating DAG at the Golgi apparatus, SMS1 modulates the recruitment and activation of downstream effectors such as protein kinase D (PKD), which in turn governs vesicular trafficking, including clathrin-mediated endocytosis (e.g. transferrin receptor internalization) and exocytic processes. Disruption of SMS1 activity affects the formation of lipid rafts that are essential for T cell receptor clustering and signaling, as well as for proper localization of ion channels and drug transporters. Moreover, SMS1-dependent regulation of membrane microdomains impacts the expression and function of proteins such as the K⁺ channel in auditory cells and multidrug resistance transporters in intestinal epithelia, emphasizing its role in organizing membrane protein complexes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFunctionally, SGMS1 has been tightly linked with disease processes and complex gene regulation. Its aberrant activity and differential expression are implicated in oncogenic processes—for example, its up‐regulation by Bcr-Abl contributes to the proliferation of chronic myelogenous leukemia cells, while in breast cancer cells, SMS1 overexpression can counteract TGF-β–induced epithelial–mesenchymal transition. Additionally, increased SGMS1 expression in the hippocampus has been associated with amyloid-beta generation in Alzheimer’s disease, and its modulation may alter lipoprotein metabolism relevant to atherosclerosis. Intricate transcriptional and post-transcriptional regulation—including the generation of alternative 5′-UTR transcripts and even noncoding circular RNAs—underscores the importance of tight SGMS1 control in diverse tissues and cellular contexts. Finally, emerging data also indicate a role for SGMS1 in autoimmune responses and in influencing drug resistance mechanisms in hepatocellular carcinoma."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "I P Vladychenskaya, L V Dergunova, S A Limborska "}, {"type": "b", "children": [{"type": "t", "text": "In vitro and in silico analysis of the predicted human MOB gene encoding a phylogenetically conserved transmembrane protein."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biomol Eng (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/s1389-0344(01)00110-1"}], "href": "https://doi.org/10.1016/s1389-0344(01"}, {"type": "t", "text": "00110-1) PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11841947"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11841947"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Shohei Yamaoka, Michihiko Miyaji, Toshiyuki Kitano, et al. 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