Reference gene panel for urinary exosome-based molecular diagnostics in patients with kidney disease

Area of Science:

• Biomarker discovery
• Molecular diagnostics
• Renal medicine

Background:

• Kidney disease, a severe diabetes complication, necessitates early detection to prevent end-stage renal disease.
• Current diagnostic methods struggle with early-stage detection, highlighting the need for novel biomarkers.
• Urinary exosome-derived microRNAs (miRNAs) show promise as early kidney disease indicators, but require reliable reference miRNAs for accurate interpretation.

Purpose of the Study:

• To identify consistently expressed reference miRNAs from urinary exosomes (UEs).
• To establish reference miRNAs for controls and patients with type 2 diabetes mellitus (T2DM) and biopsy-confirmed kidney diseases.

Main Methods:

• Isolated UEs from 31 human urine samples (healthy, T2DM, and T2DM with kidney disease) via differential ultracentrifugation.
• Performed miRNA expression profiling on isolated UEs using microarray technology.
• Analyzed microarray data to identify consistently expressed miRNAs.

Main Results:

• Identified 14 consistently expressed miRNAs in UEs across all sample groups.
• 10 of these miRNAs demonstrated significant potential as reference genes for UE analysis.
• These findings are applicable to diabetic nephropathy, membranous nephropathy, and IgA nephropathy.

Conclusions:

• Uniformly expressing UE miRNAs were identified.
• These miRNAs can serve as reliable reference genes for kidney disease biomarker studies.
• This discovery advances the potential of UE miRNAs in clinical diagnostics for kidney diseases.