{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAlthough the query requested a summary of CTXND1 function, none of the provided abstracts actually mention CTXND1. Instead, these studies focus almost exclusively on fucosyltransferase‐mediated glycosylation—particularly the enzyme FUT2—and its critical roles in generating fucosylated glycan motifs across a range of tissues. FUT2 catalyzes the addition of terminal α(1,2)‐fucose residues on mucosal glycoproteins, and in the gastric mucosa these modifications establish binding sites that facilitate Helicobacter pylori adhesion, thereby influencing infection susceptibility and downstream gastric pathology."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond the stomach, FUT2‐mediated fucosylation is shown to be a key regulator of epithelial cell function in the intestinal tract and other organs. Inflammatory and environmental cues induce the expression of fucosylated epitopes on epithelial cells and specialized secretory cells (such as Paneth cells), which in turn promote intestinal stem cell survival, bolster innate immunity, and support mucosal healing during injury."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMoreover, FUT2 activity extends to the fucosylation of glycolipids and glycoproteins in tissues such as the reproductive tract, liver, and lungs, thereby affecting a diverse array of biological processes including cell–cell adhesion, angiogenesis, and responses to both cytokine and hormonal signals. These modifications help orchestrate tissue homeostasis and disease susceptibility—for example, by modulating the risk of hepatic injury, influencing cancer metastasis, and regulating inflammatory responses—underscoring the enzyme’s broad physiological relevance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIt is important to note that while the inquiry mentioned CTXND1, none of the referenced studies provide information on this gene or its protein product. Instead, the collective findings emphasize the multifaceted roles of FUT2 and related fucosyltransferases in glycan biosynthesis, host–pathogen interactions, tissue regeneration, and immune regulation. Additional insights provided by these studies—from murine models of glycosylation deficiency to analyses of signaling pathways modulated by cytokines and hormones—reinforce the critical importance of fucosylation in maintaining mucosal barrier integrity and overall tissue health."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ana Magalhães, Joana Gomes, Mohd Nazri Ismail, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Fut2-null mice display an altered glycosylation profile and impaired BabA-mediated Helicobacter pylori adhesion to gastric mucosa."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Glycobiology (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/glycob/cwp131"}], "href": "https://doi.org/10.1093/glycob/cwp131"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19706747"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19706747"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Ana Magalhães, Yannick Rossez, Catherine Robbe-Masselot, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Muc5ac gastric mucin glycosylation is shaped by FUT2 activity and functionally impacts Helicobacter pylori binding."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Sci Rep (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/srep25575"}], "href": "https://doi.org/10.1038/srep25575"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "27161092"}], "href": "https://pubmed.ncbi.nlm.nih.gov/27161092"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Kazutaka Terahara, Tomonori Nochi, Masato Yoshida, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Distinct fucosylation of M cells and epithelial cells by Fut1 and Fut2, respectively, in response to intestinal environmental stress."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochem Biophys Res Commun (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.bbrc.2010.12.067"}], "href": "https://doi.org/10.1016/j.bbrc.2010.12.067"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21172308"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21172308"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Zhe Wang, Chen Tan, Caihan Duan, et al. "}, {"type": "b", "children": [{"type": "t", "text": "FUT2-dependent fucosylation of HYOU1 protects intestinal stem cells against inflammatory injury by regulating unfolded protein response."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Redox Biol (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.redox.2023.102618"}], "href": "https://doi.org/10.1016/j.redox.2023.102618"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "36724577"}], "href": "https://pubmed.ncbi.nlm.nih.gov/36724577"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Melinda J Jasper, Alison S Care, Brad Sullivan, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Macrophage-derived LIF and IL1B regulate alpha(1,2)fucosyltransferase 2 (Fut2) expression in mouse uterine epithelial cells during early pregnancy."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biol Reprod (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1095/biolreprod.110.085399"}], "href": "https://doi.org/10.1095/biolreprod.110.085399"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20864644"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20864644"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Luca Maroni, Simon D Hohenester, Stan F J van de Graaf, et al. 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