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• W3212264777 abstract "A20, encoded by TNFAIP3, is an effective anti-inflammatory molecule that plays a crucial role in inhibiting NF-κB signal transmission and is linked to multiple inflammatory diseases. It has been reported that the haploinsufficiency of A20 (HA20) caused by multiple base mutations in TNFAIP3 shows early-onset spontaneous Behçet-like disease. However, the mechanisms by which A20 mutations involved in inflammatory disease are incompletely defined. Herein, we reported a novel TNFAIP3 (c.1804A > T, p.T602S) variation, which has not been reported before. Summarizing the patient's immunodeficiency phenotype, we aimed to delineate the underlying mechanism for regulation of inflammation and immunity. Candidate genes associated with the Behçet-like phenotypes of the patient were screened and identified by using whole-exome and sanger sequencing. Functional studies were performed in A20(c.1804A > T, p.T602S) patient-derived peripheral blood mononuclear cells (PBMCs) and THP-1 cell lines by lentivirus mediating stable over-expression of A20 and A20(c.1804A > T, p.T602S) to analyze the activity of NF-κB signaling pathway. The clinical manifestations in patients with syndrome are Behçet-like disorder, and sequencing revealed heterozygous mutation in TNFAIP3 (c.1804A > T, p.T602S). Functional tests found that the PBMCs of the patient and his family carrying this heterozygous variant stimulated by LPS, TNF-α, or IL-1β, increased the levels of inflammatory factors and induced over-activation of the canonical NF-κB signaling pathway. Similar results were also observed in the stable transduction THP-1 (A20, c.1804A＞T) cell line stimulated by LPS, TNF-α or IL-1β. The novel loss-of-function A20 variation (c.1804A > T, p.T602S) causes over-activation of the canonical NF-κB signaling pathway and fail to terminate NF-κB signaling in response to stimulation by inflammatory cytokines. The variation triggers a dominantly-inherited Behçet-like disorder caused by haploinsufficiency of the A20 protein. Identification of the novel A20 mutation attaches great importance to prenatal diagnosis and fetal therapeutic intervention, drastically reducing the risk of newborns suffering from HA20." @default.
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• W3212264777 date "2022-01-01" @default.
• W3212264777 modified "2023-09-22" @default.
• W3212264777 title "A novel missense mutation in TNFAIP3 causes haploinsufficiency of A20" @default.
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• W3212264777 doi "https://doi.org/10.1016/j.cellimm.2021.104453" @default.
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