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Differential Gene Expression between Active and Quiescent Stages of Ulcerative Colitis: Insights into a Distinctive Pathogenesis Profile

ABSTRACT: Our objective was to elucidate patterns of gene expression underlying the progression of UC disease. Single endoscopic pinch biopsies (n=40) were assayed using the Illumina cDNA-mediated Annealing, Selection, Extension, and Ligation (DASL) microarray. Tissue was sampled in consecutive active and quiescent stages at the same site in individual UC patients, and these stages (active and inactive) were compared with each other as well as to non-inflammatory bowel disease (non-IBD) healthy controls.

ORGANISM(S): Homo sapiens

PROVIDER: GSE53306 | GEO | 2014/12/12

SECONDARY ACCESSION(S): PRJNA231677

REPOSITORIES: GEO

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Differential Gene Expression between Active and Quiescent Stages of Ulcerative Colitis: Insights into a Distinctive Pathogenesis Profile

Project description:Our objective was to elucidate patterns of gene expression underlying the progression of UC disease. Single endoscopic pinch biopsies (n=40) were assayed using the Illumina cDNA-mediated Annealing, Selection, Extension, and Ligation (DASL) microarray. Tissue was sampled in consecutive active and quiescent stages at the same site in individual UC patients, and these stages (active and inactive) were compared with each other as well as to non-inflammatory bowel disease (non-IBD) healthy controls. Gene expression of UC active and inactive is compared at a global level using total RNA from the same UC pateints using the Illumina microarray platform.

2014-12-12 | E-GEOD-53306 | biostudies-arrayexpress

Genome-wide gene expression differences between Crohn’s and ulcerative colitis from endoscopic pinch biopsies:

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Transcription profiling of human colon biopsies obtained from patients with ulcerative colitis, Chrohn's disease vs. normal to identify pathogenic processes underlying these disease subtypes

Project description:Ulcerative colitis (UC) and Crohns disease (CD) are inflammatory bowel diseases (IBD) with variable, overlapping clinical features and complex pathophysiologies. To identify pathogenic processes underlying these disease subtypes, using single endoscopic pinch biopsies to estabolish 36 expression profiles, we elucidated gene expression patterns of active and inactive areas of UC and CD, and compared these to infectious colitis and healthy controls.To identify pathogenic processes underlying these disease subtypes, using single endoscopic pinch biopsies, we elucidated gene expression patterns of active and inactive areas of UC and CD, and compared these to infectious colitis and healthy controls. An unsupervised classification of a total of 36 samples yielded promising separation between IBD affected, unaffected, non-IBD colitis and normal controls, suggesting distinctive gene expression patterns for each sample type. The Significance Analysis of Microarays (SAM) software to select biologically significant changes in gene expression between groups. The criteria selected for SAM analysis are, a median false discovery rate (FDR) ? 0.00001%, fold change >2, and a Log2 mean expression index > 6.64.

2007-11-02 | E-GEOD-6731 | biostudies-arrayexpress

Transcription profiling of human ulcerative colitis colonic mucosa to define an ulcerative colitis preinflammatory state

Project description:The samples are a part of a study aiming at diagnosing ulcerative colitis from genome-wide gene expression analysis of the colonic mucosa. Colonic mucosal samples were collected as endoscopic pinch biopsies from ulcerative colitis patients and from control subjects. Samples with and without macroscopic signs of inflammation were collected from the patients. Experiment Overall Design: The series contain eight UC samples with macroscopic signs of inflammation, 13 UC smaples without macroscopic signs of inflammation, five control subjects.

2008-06-20 | E-GEOD-9452 | biostudies-arrayexpress

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Expression data from intestinal mucosa of patients with UC

Project description:Ulcerative colitis (UC) is a chronic inflammatory disease of the colon with preiods of active disease followed by remission. We performed a whole-genome transcriptional analysis of colonic biopsies from patients with histologically active and inactive UC, as well as non-inflammatory controls. Ulcerative colitis patients and non-inflammatory controls were collected for RNA extraction and hybridization on Affymetrix microarrays. Inclusion criteria for UC patients were: age between 18 and 65, diagnosis of UC established at least 6 months before inclusion and exclusion of concomitant infection. Active disease was defined by endoscopic and histologic score: Mayo sub score >=2 and MATTS >=3 respectively . Inactive disease was also defined by endoscopic and histologic score: Mayo sub score =0 and MATTS <=2 respectively, and a remission state for a minimum of 5 month prior to biopsy collection, and remained inactive for at least 6 months after. Uninvolved mucosa from patients with active UC was defined as a colonic segment with completely normal endoscopic appearance, normal histology, and absence of any previous evidence of active disease. Finally, a total of 43 biopsies were analyzed: 13 healthy controls, 8 inactive UC, 7 non-involved active UC and 15 involved active UC.

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Project description:Infliximab, an anti-TNF-alpha monoclonal antibody, is an effective treatment for ulcerative colitis (UC) with over 60% of patients responding to treatment and up to 30% reaching remission. The mechanism of resistance to anti-TNF-alpha is unknown. This study used colonic mucosal gene expression to provide a predictive response signature for infliximab treatment in UC. Keywords: drug response Twenty-four patients with active UC, refractory to corticosteroids and/or immunosuppression, underwent colonoscopy with biopsies from diseased colon within a week prior to the first intravenous infusion of 5 mg infliximab per kg body weight. Response to infliximab was defined as endoscopic and histologic healing at 4-6 weeks after first infliximab treatment. Six control patients with normal colonoscopy were included. Total RNA was isolated from colonic mucosal biopsies, labelled and hybridized to Affymetrix Human Genome U133 Plus 2.0 Arrays.

2010-01-06 | E-GEOD-14580 | biostudies-arrayexpress

Transcriptional signatures that define Ulcerative Colitis in remission

Project description:Background: This study addresses whether existing specific transcriptional profiles can improve and support the current status of the definition of ulcerative colitis (UC) remission apart from the existing endoscopic, histologic, and laboratory scoring systems. For that purpose, a well-stratified UC patient population in remission was compared to active UC and control patients and was investigated by applying the next-generation technology RNA-Seq. Methods: Mucosal biopsies from patients in remission (n = 14), patients with active UC (n = 14), and healthy control patients (n = 16) underwent whole-transcriptome RNA-Seq. Principal component analysis, cell deconvolution methods, gene profile enrichment, and pathway enrichment methods were applied to define a specific transcriptional signature of UC in remission. Results: Analyses revealed specific transcriptional signatures for UC in remission with increased expression of genes involved in O-glycosylation (MUC17, MUC3A, MUC5AC, MUC12, SPON1, B3GNT3), ephrin-mediated repulsion of cells (EFNB2E, EFNA3, EPHA10, EPHA1), GAP junction trafficking (TUBA1C, TUBA4A, TUBB4B, GJB3, CLTB), and decreased expression of several toll-like receptors (TLR1, TLR3, TLR5, TLR6). Conclusions: This study reveals specific transcriptional signatures for remission. Partial restoration and improvement of homeostasis in the epithelial mucus layer and revival of immunological functions were observed. A clear role for bacterial gut flora composition can be implied. The results can be useful for the development of treatment strategies for UC in remission and may be useful targets for further investigations aiming to predict the outcome of UC in the future.

2020-01-18 | GSE128682 | GEO

Differential Gene Expression between involved and uninvolved sites of Crohn’s disease: Insights into a Distinctive Pathogenesis Profile

Project description:Our objective was to elucidate patterns of gene expression underlying the progression of CD disease. Surgery biopsies (n=60) were assayed using the Illumina cDNA-mediated Annealing, Selection, Extension, and Ligation (DASL) microarray process specifically designed for use with Formalin-Fixed, Paraffin-Embedded (FFPE) clinical samples. Tissue was sampled in consecutive active involved and uninvolved sites at the same time in individual CD patients, and these samples (CD involved and CD uninvolved) were compared with each other as well as to non-inflammatory bowel disease (non-IBD) healthy controls.

2019-02-20 | GSE95095 | GEO

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