{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPEAR1 is a transmembrane receptor predominantly expressed on platelets and endothelial cells that plays a central role in platelet aggregation. Upon platelet–platelet contact, PEAR1 becomes activated and undergoes phosphorylation on key tyrosine and serine residues, which initiates downstream signaling cascades and facilitates the stabilization of platelet aggregates. In addition, PEAR1 activation mediates the recruitment of adaptor proteins (for example, ShcB) that help transmit activation signals, thereby modulating the extent of degranulation and aggregation in response to various agonists. These findings, based on functional studies and genetic analyses, implicate PEAR1 as a novel mediator in platelet signal transduction and aggregation dynamics."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic variation in the PEAR1 gene has been shown to contribute substantially to interindividual differences in platelet reactivity and response to antiplatelet therapies. Common polymorphisms—most notably the intronic single‐nucleotide polymorphism rs12041331 along with other exonic and regulatory variants—alter PEAR1 expression levels and can influence the signaling strength of the receptor. Such allele‐specific differences, which are sometimes mediated by differential DNA methylation and enhancer activity, have been linked to variations in aggregation responses to agents such as aspirin, clopidogrel, prasugrel, and ticagrelor, and are associated with differences in cardiovascular outcomes, ischemic events, and even stroke recurrence. These associations underscore the clinical potential of PEAR1 genotype as a biomarker for tailoring antiplatelet therapy."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its central role in platelet activation, PEAR1 is also implicated in broader cellular processes including megakaryopoiesis, endothelial cell function, and even hematopoietic development. Experimental studies have demonstrated that modulation of PEAR1 levels in megakaryocyte precursors influences thrombopoiesis through pathways such as PI3K–Akt signaling, while its expression in endothelial cells may affect angiogenic responses and vascular integrity. Furthermore, PEAR1 has been identified as a receptor for natural and synthetic fucose‐based polysaccharides that can activate downstream Src‐ and PI3K‐dependent signaling cascades. These diverse functions suggest that PEAR1 acts as an integrative hub, linking platelet aggregation with vascular biology and hematopoietic fate decisions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Nisha Nanda, Ming Bao, Hanna Lin, et al. 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