Myo1e knockout in the adult podocytes leads to proteinuria but has less severe consequences for kidney function than Myo1e loss during renal development
Chase, S. E.; Krendel, M.
Show abstract
Myosin 1e (Myo1e) is expressed in specialized epithelial cells in the kidney (podocytes) and plays an important role in renal filtration. Knockout of Myo1e in mice and mutations in the MYO1E gene in humans cause proteinuria and disrupt the ultrastructure of glomeruli, the initial segments of renal nephrons that are responsible for selective excretion of waste products without the loss of proteins from the bloodstream. Previous studies have demonstrated that the loss of Myo1e early in development results in severe defects in renal function in mice and may lead to end-stage renal disease in patients homozygous for MYO1E mutations. However, little is known about the effects of Myo1e loss later in life. In this study, we used inducible knockout of Myo1e in mouse podocytes to examine the effects of Myo1e loss from the adult kidneys. We have found that Myo1e loss after the completion of renal development causes proteinuria and podocyte defects but the effects are milder and more variable compared to the effects of Myo1e knockout in developing podocytes. These findings indicate that Myo1e plays an important role in podocyte development and differentiation but may also contribute to the maintenance of the glomerular barrier in the adult kidneys.
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