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• W3037860988 abstract "Abstract Background & Aims Primary non-response (PNR) to anti-tumor necrosis factor-α (TNFα) biologics is a serious concern in patients with inflammatory bowel disease (IBD). We aimed to identify the genetic variants associated with PNR. Methods Patients were recruited from outpatient GI clinics and PNR was determined using both clinical and endoscopic findings. A case-control genome-wide association study was performed in 589 IBD patients and associations were replicated in an independent cohort of 293 patients. Effect of the associated variant on gene expression and TNFα secretion was assessed by cell-based assays. Pleiotropic effects were investigated by Phenome-wide Association Study (PheWAS). Results We identified rs34767465 as associated with PNR to anti-TNF-α therapy (OR:2.07, 95%CI:1.46-2.94, p=2.43×10 −7 , [Replication OR:1.8, 95%CI:1.04-3.16, p=0.03]). rs34767465 is a multiple-tissue expression quantitative trait loci for FAM114A2 . Using RNA-sequencing and protein quantification from HapMap lymphoblastoid cell lines (LCLs), we found a significant decrease in FAM114A2 mRNA and protein expression in both heterozygous and homozygous genotypes when compared to wild type LCLs. TNF-α secretion was significantly higher in THP-1 cells [differentiated into macrophages] with FAM114A2 knockdown versus controls. Immunoblotting experiments showed that depletion of FAM114A2 impaired autophagy related pathway genes suggesting autophagy mediated TNF-α secretion as a potential mechanism. PheWAS showed rs34767465 was associated with comorbid conditions found in IBD patients (derangement of joints [p=2.3×10 −4 ], pigmentary iris degeneration [p=5.1×10 −4 ], diverticulum of esophagus [p=6.3×10 −4 ]). Conclusion We identified a variant rs34767465 associated with PNR to anti-TNFα biologics, which increases TNFα secretion through mechanism related to autophagy. rs34767465 may also explain the comorbidities associated with IBD." @default.
• W3037860988 created "2020-07-02" @default.
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• W3037860988 date "2020-06-24" @default.
• W3037860988 modified "2023-10-18" @default.
• W3037860988 title "Genetic association of primary non-response to Anti-TNFα therapy in patients with Inflammatory Bowel Disease" @default.
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• W3037860988 doi "https://doi.org/10.1101/2020.06.23.20138495" @default.
• W3037860988 hasPublicationYear "2020" @default.
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