{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n KIAA1109 is a large, evolutionarily conserved gene that has not been fully functionally characterized at the molecular level. Multiple genome‐wide association studies have repeatedly implicated the gene region encompassing KIAA1109 (usually as part of a linkage‐disequilibrium block with the adjacent TENR, IL2, and IL21 genes) in susceptibility to a diverse range of autoimmune and inflammatory conditions, including celiac disease, rheumatoid arthritis, type 1 diabetes, uveitis, and others."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": " Although the precise biological role of KIAA1109 in immune regulation remains to be elucidated, the consistent genetic associations suggest that it may influence pathways governing adaptive immunity.\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition, studies have established that biallelic, often truncating, pathogenic variants in KIAA1109 cause Alkuraya–Kučinskas syndrome – an autosomal recessive multisystem disorder characterized by cerebral parenchymal underdevelopment, arthrogryposis, clubfoot, and global developmental delay (indicating a critical role during embryonic and neural development)."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "8"}]}, {"type": "t", "text": " \n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, there is emerging evidence linking variants in the KIAA1109 region with cancer outcomes. One study has suggested that variation at this locus may contribute to prostate cancer susceptibility in men with a family history of the disease"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", and another has associated KIAA1109 mutations with a poor prognosis in esophageal squamous cell carcinoma."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, although the specific biochemical function of KIAA1109 remains largely uncharacterized, genetic evidence indicates that this gene plays a significant role in immune regulation and embryonic neural development, with potential implications in oncogenesis. Further functional studies are warranted to uncover its mechanistic contributions to these diverse biological processes.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "David A van Heel, Lude Franke, Karen A Hunt, et al. "}, {"type": "b", "children": [{"type": "t", "text": "A genome-wide association study for celiac disease identifies risk variants in the region harboring IL2 and IL21."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Genet (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/ng2058"}], "href": "https://doi.org/10.1038/ng2058"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17558408"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17558408"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Alexandra Zhernakova, Behrooz Z Alizadeh, Marianna Bevova, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Novel association in chromosome 4q27 region with rheumatoid arthritis and confirmation of type 1 diabetes point to a general risk locus for autoimmune diseases."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Hum Genet (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1086/522037"}], "href": "https://doi.org/10.1086/522037"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17999365"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17999365"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Amit K Maiti, Xana Kim-Howard, Parvathi Viswanathan, et al. 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