{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n LYRM1 is emerging as a multifunctional gene that plays diverse roles in energy metabolism, cell survival, and tissue homeostasis. In human adipose tissue, LYRM1 is highly expressed and predominantly localized to the nucleus, where it promotes preadipocyte proliferation and concurrently suppresses apoptosis, thereby potentially expanding the preadipocyte pool and influencing adipogenesis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": " In several studies employing adipocyte and skeletal muscle models, overexpression of LYRM1 has been shown to disrupt mitochondrial integrity – leading to abnormal mitochondrial morphology, lowered intracellular ATP production, elevated reactive oxygen species (ROS) levels, and impaired insulin signaling (resulting in reduced GLUT4 translocation and decreased insulin-stimulated glucose uptake) – thereby contributing to the development of insulin resistance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "9"}]}, {"type": "t", "text": " Conversely, knockdown experiments in adipocytes demonstrate improved mitochondrial performance—evidenced by increased ATP production, heightened mitochondrial membrane potential, upregulation of Ucp2, and reduced ROS levels—supporting the view that LYRM1 is a critical regulator of mitochondrial bioenergetics and insulin sensitivity. In cardiac cell models, LYRM1 has similarly been implicated in modulating cell fate; its expression supports the proliferation and survival of cardiac progenitor cells, while its reduction leads to increased apoptosis, diminished energy production, and impaired differentiation into cardiomyocytes, suggesting a role in heart development."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "12"}]}, {"type": "t", "text": " Moreover, studies in bovine models reveal that polymorphisms in LYRM1 are significantly associated with body measurement and meat quality traits, linking LYRM1 to fat deposition and overall adipose tissue function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": " Finally, the regulation of LYRM1 expression itself appears to be modulated by metabolic and inflammatory factors – with free fatty acids and tumor necrosis factor‐α upregulating LYRM1 levels – further underscoring its potential role as a mediator in obesity‐related insulin resistance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": " Collectively, these data indicate that LYRM1 is a key player in balancing cell proliferation, apoptosis, and mitochondrial function, with downstream effects on insulin sensitivity and metabolic homeostasis across different tissues and species.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jie Qiu, Chun-Lin Gao, Min Zhang, et al. 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