Hirschsprung's disease: key microRNAs and target genes

Area of Science:

• Gastroenterology
• Molecular Biology
• Genetics

Background:

• Hirschsprung's disease (HSCR) pathogenesis involves complex molecular mechanisms that are not fully understood.
• Current HSCR diagnosis relies on invasive rectal biopsies, highlighting the need for non-invasive diagnostic methods.

Purpose of the Study:

• To identify key microRNAs (miRNAs), pathways, and target genes involved in HSCR pathogenesis.
• To investigate the diagnostic potential of specific miRNAs as biomarkers for HSCR.

Main Methods:

• Comparative analysis of miRNA expression in HSCR ganglionic and aganglionic colon tissues using Gene Expression Omnibus and RT-qPCR.
• Identification of colon tissue-specific miRNAs using the TAM 2.0 database.
• Investigation of miRNA-mRNA interactions using StarBase, TargetScan, luciferase reporter assays, and Western blot.
• Functional validation of miRNA roles through migration assays and pathway enrichment analysis using OmicShare.

Main Results:

• Three colon tissue-specific miRNAs (hsa-miR-192-5p, hsa-miR-200a-3p, hsa-miR-200b-3p) were significantly upregulated in aganglionic HSCR tissues.
• These miRNAs were found to reduce cell viability and migration, interacting directly with ZEB2 and FNDC3B.
• Elevated plasma levels of these three miRNAs were observed in HSCR patients compared to controls.

Conclusions:

• Hsa-miR-192-5p, hsa-miR-200a-3p, and hsa-miR-200b-3p are potential peripheral biomarkers for HSCR diagnosis.
• These circulating miRNAs offer a promising avenue for developing non-invasive diagnostic tests for HSCR.