Profiling non-coding RNA levels with clinical classifiers in pediatric Crohn's disease

Area of Science:

• Genetics and Genomics
• Gastroenterology
• Molecular Biology

Background:

• Crohn's disease (CD) is a chronic inflammatory disorder with a genetic basis.
• Non-coding RNAs (ncRNAs) are crucial regulators of gene expression and protein function, impacting biological processes.
• Dysregulation of ncRNAs in CD may influence disease progression and outcomes.

Purpose of the Study:

• To investigate if ncRNAs are dysregulated in Crohn's disease at diagnosis.
• To determine if ncRNA signatures can predict disease location, behavior, and inflammation.
• To assess the potential of ncRNAs as biomarkers for CD outcomes.

Main Methods:

• Analysis of ncRNA from ileal and rectal biopsies of 345 CD patients and 132 non-IBD controls.
• Sequence alignment using Human Genome version 38 (hg38).
• Differential expression analysis using EdgeR with a fold change > 2 and FDR < 0.05 threshold.

Main Results:

• Identified 130 CD-specific differentially expressed ncRNAs (89 in ileum, 41 in rectum).
• Found 35 DE ncRNAs between different disease behaviors in the ileum, but not in the rectum.
• Observed increased expression of specific ncRNAs (mir1244-2, mir1244-3, mir1244-4, RN7SL2) regardless of disease status or inflammation.

Conclusions:

• ncRNAs are specific to CD disease location, behavior, and inflammation.
• ncRNA expression changes during CD progression in the intestinal mucosa.
• ncRNA signatures may have clinical utility for early CD identification and characterization.