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Challenges in Defining a Reference Set of Differentially Expressed lncRNAs in Ulcerative Colitis by Meta-Analysis.

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Researchers identified 19 common differentially expressed long non-coding RNAs (lncRNAs) in ulcerative colitis (UC) using gene expression data. These lncRNAs may serve as biomarkers for active UC and are linked to colorectal cancer progression.

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Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Bioinformatics

Background:

  • Ulcerative colitis (UC) is a chronic inflammatory bowel disease.
  • Identifying reliable biomarkers for active UC is crucial for patient management.
  • Long non-coding RNAs (lncRNAs) play roles in various biological processes and diseases.

Purpose of the Study:

  • To identify common differentially expressed lncRNAs in ulcerative colitis (UC) using publicly available gene expression datasets.
  • To explore the potential of these lncRNAs as biomarkers for active UC.
  • To investigate the association of identified lncRNAs with colorectal cancer (CRC) pathways.

Main Methods:

  • Manual curation of nine human colonic biopsy transcriptomic datasets from the Gene Expression Omnibus (GEO).
  • Utilized R packages (geneknitR, gprofiler, clusterProfiler) for gene symbol annotation.
  • Employed the R EdgeR package for differential expression analysis to identify lncRNAs present in at least three datasets.

Main Results:

  • Identified nineteen differentially expressed lncRNAs common across multiple UC GEO datasets.
  • Several identified lncRNAs are associated with colorectal cancer (CRC) progression, including regulation of gene expression, epithelial-to-mesenchymal transition (EMT), cell cycle, proliferation, invasion, and migration.
  • Observed variations in lncRNA expression based on disease state and tissue location within UC.

Conclusions:

  • The nineteen identified lncRNAs may serve as general biomarkers for active ulcerative colitis, independent of biopsy location, age, gender, or treatment.
  • These findings provide a valuable resource for future research and comparisons using existing GEO UC datasets.
  • The identified lncRNAs' association with CRC pathways warrants further investigation into their dual role in inflammation and cancer.