{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nDchs1 is a key component of an evolutionarily conserved signaling system that regulates planar cell polarity and tissue morphogenesis. Expression studies in mice reveal that Dchs1 is expressed in distinct mesenchymal domains with a complementary pattern to other pathway members, and its protein product plays a pivotal role in organizing cellular architecture—such as in neural progenitor apical membranes—by partnering with Fat cadherins. Gene‐targeted mutations in Dchs1 have demonstrated multi‐organ defects, underscoring its role as a ligand in the Dchs1–Fat4 pathway. Detailed structural analyses also indicate that the Dchs1 ectodomain, with its non‐Ca²⁺–binding regions, can adopt flexible, bent configurations that likely facilitate interactions in confined intercellular spaces."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFunctionally, Dchs1–Fat4 signaling is critical for coordinating the balance between progenitor proliferation and differentiation during organogenesis. In the kidney, loss of Dchs1 (or its binding partner Fat4) leads to expansion of the nephron progenitor pool and disruption of normal morphogenesis, while similar mutations result in mitral valve prolapse by impairing valve morphogenesis and cellular patterning in cardiac tissues. Additional studies have probed the role of this signaling axis in the lymphatic vasculature, suggesting that it may broadly influence intercellular communication and organ architecture."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMoreover, Dchs1 is essential for proper skeletal and craniofacial development. In the developing sternum and vertebrae, Dchs1–Fat4 signaling governs cell orientation, condensation, and proliferation, ensuring appropriate skeletal dimensions and patterning. Its function extends to osteoblast differentiation, where loss of Dchs1 delays maturation and alters the behavior of progenitor cells—findings that recapitulate aspects of the human Van Maldergem syndrome. In some genetic contexts, aberrations in Dchs1, including transposable element insertions that dramatically reduce its expression, result in neonatal lethality, underscoring its critical developmental roles."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Rebecca Rock, Sabrina Schrauth, Manfred Gessler "}, {"type": "b", "children": [{"type": "t", "text": "Expression of mouse dchs1, fjx1, and fat-j suggests conservation of the planar cell polarity pathway identified in Drosophila."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Dev Dyn (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/dvdy.20515"}], "href": "https://doi.org/10.1002/dvdy.20515"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16059920"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16059920"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Takashi Ishiuchi, Kazuyo Misaki, Shigenobu Yonemura, et al. 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