{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPLPP7, also known as NET39 or Ppapdc3, is a nuclear envelope transmembrane protein that plays a critical role in muscle cell differentiation. Studies have demonstrated that high expression of PLPP7 in cardiac and skeletal muscle is associated with myoblast differentiation, where its increased levels correlate with the repression of differentiation. Mechanistically, PLPP7 interacts with mTOR to attenuate mTOR signaling, leading to reduced insulin‐like growth factor II production and dampened autocrine signals—a cascade that ultimately delays myogenesis. (See"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ")\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn vivo evidence further underscores the functional importance of PLPP7 in muscle physiology. Mice deficient in PLPP7 exhibit severe myopathy accompanied by disruptions in nuclear integrity, altered chromatin accessibility, and aberrant gene expression, ultimately culminating in juvenile lethality. These phenotypic alterations parallel the features observed in Emery-Dreifuss muscular dystrophy (EDMD) cases, suggesting that PLPP7 contributes to the maintenance of nuclear envelope structure and chromatin organization in muscle tissue. (See"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ")\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nTogether, these studies indicate that PLPP7 is a multifunctional regulator within muscle cells, crucial not only for modulating mTOR-driven differentiation signals but also for preserving nuclear and chromatin architecture essential for muscle homeostasis. The dual roles of PLPP7 in both signaling and structural maintenance highlight its significance in normal muscle physiology and its potential contribution to the molecular etiology of muscular dystrophies. (See"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ")\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Guang-Hui Liu, Tinglu Guan, Kaustuv Datta, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Regulation of myoblast differentiation by the nuclear envelope protein NET39."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biol (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/MCB.00684-09"}], "href": "https://doi.org/10.1128/MCB.00684-09"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19704009"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19704009"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Andres Ramirez-Martinez, Yichi Zhang, Kenian Chen, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The nuclear envelope protein Net39 is essential for muscle nuclear integrity and chromatin organization."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Commun (2021)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/s41467-021-20987-x"}], "href": "https://doi.org/10.1038/s41467-021-20987-x"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "33514739"}], "href": "https://pubmed.ncbi.nlm.nih.gov/33514739"}]}]}]}