MicroRNA-17~92 is required for nephrogenesis and renal function

Area of Science:

• Developmental Biology
• Molecular Biology
• Genetics

Background:

• MicroRNAs (miRNAs) are key regulators of gene expression, but their specific roles in nephron progenitor cells remain largely unknown.
• Mutations in the MIR17HG cluster, encoding the miR-17~92 miRNA family, are linked to Feingold syndrome and developmental defects.

Purpose of the Study:

• To investigate the role of the miR-17~92 miRNA cluster in kidney development and function.
• To determine the impact of miR-17~92 deletion in nephron progenitors on renal structure and physiology.

Main Methods:

• Generation of mice with a conditional deletion of the miR-17~92 cluster specifically in nephron progenitors and their derivatives.
• Analysis of nephron progenitor cell populations, nephron number, and renal function in mutant mice.
• Histological examination of kidneys to assess structural abnormalities like glomerulosclerosis and podocyte effacement.

Main Results:

• Conditional deletion of miR-17~92 in nephron progenitors preserved the progenitor population but impaired cell proliferation.
• Mutant mice exhibited a reduced number of developing nephrons.
• Postnatal development of renal disease in mutant mice, including albuminuria and glomerulosclerosis.

Conclusions:

• The miR-17~92 miRNA cluster plays a critical role in regulating nephron development.
• Dysregulation of miR-17~92 contributes to renal developmental defects and subsequent kidney dysfunction in adult mice.