{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSUMO4 is a member of the small ubiquitin‐like modifier protein family that exerts critical regulatory functions at the post‐translational level. It is well documented to conjugate to target proteins – most notably to IκBα – thereby repressing the transcriptional activity of nuclear factor κB (NF‐κB) and ultimately attenuating downstream pro‐inflammatory gene expression. A naturally occurring amino acid substitution (M55V) in an evolutionarily conserved region of SUMO4 has been shown to impair its inhibitory capacity, resulting in increased NF‐κB activity and elevated expression of cytokine genes, which is believed to contribute to the pathogenesis of autoimmune conditions such as type 1 diabetes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nUnder conditions of cellular stress, SUMO4 undergoes a rapid maturation process via stress‐induced hydrolases that expose its essential C‐terminal di‐glycine motif, a prerequisite for its conjugation to substrates. Once matured, SUMO4 can covalently attach to various target proteins—including key transcription factors besides IκBα—to fine‐tune the cellular response; for instance, its conjugation has been associated with repression of AP‐1 and AP‐2α transcriptional activity while enhancing glucocorticoid receptor DNA binding. In addition, evidence indicates that SUMO4 expression is controlled by NF‐κB itself, suggesting a negative feedback loop that restrains excessive inflammatory signaling."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "18", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nNumerous genetic association studies have linked SUMO4 polymorphisms—notably the M55V variant—to autoimmune and metabolic diseases including type 1 and type 2 diabetes, diabetic nephropathy, Graves’ disease, psoriasis, and other inflammatory disorders. Although many reports have focused on the allele frequency and clinical correlations in diverse ethnic populations (with some discrepancies between Asians and Caucasians), these studies underscore how alterations in SUMO4 function can modify immune responsiveness and stress regulation. Furthermore, investigations into other clinical contexts such as placental development, tacrolimus metabolism post–liver transplantation, and rheumatoid arthritis have also highlighted the broader relevance of SUMO4 activity in modulating disease phenotypes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies have extended these observations to other immune‐mediated conditions, supporting the view that SUMO4 serves as a pivotal modulator of the immune response by controlling the amplitude and duration of critical signaling pathways under both basal and stress conditions. This convergence of mechanistic and clinical evidence reinforces the importance of SUMO4 sumoylation in maintaining immune homeostasis and mitigating aberrant inflammation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "20"}, {"type": "fg_f", "ref": "5"}, {"type": "fg_f", "ref": "29"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Dehuang Guo, Manyu Li, Yan Zhang, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "The type 1 diabetes susceptibility gene SUMO4 at IDDM5 is not associated with susceptibility to rheumatoid arthritis or juvenile idiopathic arthritis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Rheumatology (Oxford) (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/rheumatology/kei041"}], "href": "https://doi.org/10.1093/rheumatology/kei041"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16159953"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16159953"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Masako Tsurumaru, Eiji Kawasaki, Hiroaki Ida, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "No evidence of association of CTLA-4 -318 C/T, 159 C/T, 3' STR and SUMO4 163 AG polymorphism with autoimmune diabetes."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Immunol Invest (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1080/08820130601109735"}], "href": "https://doi.org/10.1080/08820130601109735"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17558709"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17558709"}]}, {"type": "r", "ref": 16, "children": [{"type": "t", "text": "Cong-Yi Wang, Jin-Xiong She "}, {"type": "b", "children": [{"type": "t", "text": "SUMO4 and its role in type 1 diabetes pathogenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Diabetes Metab Res Rev (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/dmrr.797"}], "href": "https://doi.org/10.1002/dmrr.797"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17990297"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17990297"}]}, {"type": "r", "ref": 17, "children": [{"type": "t", "text": "Hong Li, Lin Gao, Zhu Shen, et al. 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