Differentially expressed microRNAs targeting genes in key pathways in keratoconus

Area of Science:

• Ophthalmology
• Genetics
• Molecular Biology

Background:

• Keratoconus (KTCN) is a progressive corneal ectasia with complex multifactorial etiology.
• MicroRNAs (miRNAs) are implicated in KTCN pathogenesis, but specific molecular players require identification.

Purpose of the Study:

• To identify differentially expressed precursor microRNAs (pre-miRNAs) in KTCN corneas.
• To characterize mature miRNAs and their target genes in KTCN.
• To elucidate the molecular pathways affected by these miRNAs and their targets.

Main Methods:

• Retrieved pre-miRNA expression data from RNA sequencing of KTCN and non-KTCN human corneas.
• Identified differentially expressed pre-miRNAs using FDR ≤0.01 and fold change ≥1.5.
• Utilized miRDB for target gene identification and DAVID database for enrichment analyses.

Main Results:

• Six pre-miRNAs were upregulated (e.g., MIR184, MIR200A) and four downregulated (e.g., MIR6081, MIR27B) in KTCN corneas.
• Identified 1,409 target genes, with 220 showing decreased and 57 increased expression in KTCN.
• Enrichment analyses highlighted disrupted extracellular matrix organization, response to mechanical stimulus, and signal transduction pathways.

Conclusions:

• Specific miRNAs and their target genes are potentially involved in KTCN pathogenesis.
• Disruption of extracellular matrix organization and signal transduction are key molecular processes affected in KTCN.
• Further research into these miRNA-target interactions could reveal novel therapeutic targets for KTCN.