{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTHSD1, a protein containing a thrombospondin type I domain, plays an integral role in vascular homeostasis by modulating focal adhesion dynamics and endothelial cell function. Similar to the thrombospondin‐1–mediated signaling described in (1), THSD1 localizes to focal adhesions where it interacts with focal adhesion kinase (FAK) to maintain adhesion stability. Recent studies have demonstrated that THSD1 negatively regulates the autophagy cascade at focal adhesions through its modulation of Beclin 1 phosphorylation, thereby preventing excessive degradation of these adhesion sites and contributing to proper cell spreading and barrier integrity in brain endothelial cells (10). Furthermore, embryonic studies have identified THSD1 as a putative angiopotent factor, suggesting its wider role in vascular development (4)."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of tumorigenesis, THSD1 appears to function as a tumor suppressor. Loss of THSD1 expression—through mechanisms such as promoter hypermethylation and loss of heterozygosity—has been observed in esophageal squamous cell carcinoma and colorectal cancer, where its down-regulation correlates with increased cellular proliferation and colony-forming potential (3,5). Such epigenetic silencing and reduced expression underscore its growth-suppressive activity in these malignancies."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic studies have further implicated THSD1 in a spectrum of vascular and developmental disorders. Mutations and harmful variants in THSD1 have been associated with intracranial aneurysms and subarachnoid hemorrhage (2,7), while biallelic loss-of-function variants have been linked to non-immune hydrops fetalis, congenital heart defects, hemangiomas, and prematurity (8,9). In addition, its detection in intervertebral disc tissue (6) suggests other context-specific functions that may broaden its impact on human physiology and disease."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Anthony Wayne Orr, Manuel Antonio Pallero, Wen-Cheng Xiong, et al. 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