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Whole transcription profile of responders to anti-TNF drugs in pediatric inflammatory bowel disease

ABSTRACT: Background: In pediatric inflammatory bowel disease (IBD) up to 30% of patients do not respond to anti-TNF therapy. The aim was to identify pharmacogenomic markers that predict early response to anti-TNF drugs in pediatric patients with IBD. Methods: The study population included 29 responders and 9 non-responders to anti-TNF therapy patients aged <18 years with IBD who started treatment with infliximab or adalimumab. Whole gene expression profiles from total RNA isolated from whole-blood samples of 6 responders and 6 non-responders taken before biologic administration and after 2 weeks were analyzed by RNA next-generation sequencing. The expression of 6 selected genes was measured for validation in all of 38 patients recruited using qPCR; Results: Differentially expressed genes in non-responders versus responders to anti-TNF treatment were identified, 32 prior treatment initiation and 44 after 2 weeks (Log2FC (Fold change)>0.6 o <-0.6 and p value < 0.05). After validation, FCGR1A, FCGR1B and GBP1 were overexpressed in non-responders after 2 weeks of anti-TNF treatment (Log2FC 1.05, 1.21 and 1.08, respectively, p value <0.05,); Conclusion: Expression of the FCGR1A, FCGR1B, and GBP1 genes is a pharmacogenomic biomarker of early response to anti-TNF agents in pediatric IBD.

ORGANISM(S): Homo sapiens

PROVIDER: GSE159034 | GEO | 2021/01/14

REPOSITORIES: GEO

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Project description:Background/aims: Changes in gene expression profiles among individuals with inflammatory bowel diseases (IBDs) could potentially influence the responsiveness to anti-TNF treatment. The aim of this study was to identify genes that could serve as predictors of early response to anti-TNF therapies in pediatric IBD patients prior to the initiation of treatment.Methods: We conducted a prospective, longitudinal, and multicenter study, enrolling 24 pediatric IBD patients aged less than 18 years who were initiating treatment with either infliximab or adalimumab. RNA-seq from blood samples was analyzed using the DESeq2 library by comparing responders and non-responders to anti-TNF drugs. Results: Bioinformatic analyses unveiled 102 differentially expressed genes, with 99 genes exhibiting higher expression in responders compared to non-responders prior to the initiation of anti-TNF therapy. Functional enrichment analyses highlighted defense response to Gram-negative bacteria (FDR =2.3 ×10–7) as the most significant biological processes, and hemoglobin binding (FDR =0.002), as the most significant molecular function. Gene Set Enrichment Analysis (GSEA) revealed notable enrichment in transcriptional misregulation in cancer (FDR =0.016). Notably, 13 genes (CEACAM8, CEACAM6, CILP2, COL17A1, OLFM4, INHBA, LCN2, LTF, MMP8, DEFA4, PRTN3, AZU1, and ELANE) were selected for validation, and a consistent trend of increased expression in responders prior to drug administration was observed for most of these genes, with findings for 4 of them being statistically significant (CEACAM8, LCN2, LTF2, and PRTN3). Conclusions: We identified 102 differentially expressed genes involved in the response to anti-TNF drugs in children with IBDs and validated CEACAM8, LCN2, LTF2, and PRTN3. Genes participating in defense response to Gram-negative bacterium, serine-type endopeptidase activity, and transcriptional misregulation in cancer are good candidates for anticipating the response to anti-TNF drugs in children with IBDs.

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Whole transcription profile of responders to anti-TNF drugs in pediatric inflammatory bowel disease

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