Unraveling the molecular make-up of the glomerular podocyte slit diaphragm

• Recent discoveries in podocyte proteins involved in the renal filtration barrier have shed new light on the ultrastructure of the kidney filter and pathogenesis of proteinuria. The identification of nephrin, a component of the slit diaphragm, and the intracellular slit diaphragm associated proteins CD2AP and podocin has demonstrated the existence of proteins that directly contribute to a functional kidney filter. Mutations in the genes for these three proteins result in proteinuria and nephrotic syndrome, and these proteins are also likely to be involved more generally in the pathomechanisms of proteinuria. This new knowledge has been promoted particularly through the powerful methods of molecular genetics and molecular biology. In this minireview, we present the recent progress in research of the podocyte slit diaphragm.

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