Cryo-electron tomographic analysis of anti-nephrin–mediated podocytopathy

2026 · doi:10.64898/2026.02.26.708131
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This study uses cryo-electron tomography to examine the ultrastructural changes in the glomerular filtration barrier in anti-nephrin–mediated podocytopathy, visualizing the near-native slit diaphragm across defined disease stages. The authors report that early stages show punctuate membrane approximations and basal membrane apposition between podocyte foot processes, alongside progressive bending of the planar “fishnet” slit diaphragm into a dome-shaped configuration toward the urinary space. In later stages, they observe slit diaphragm disappearance accompanied by endosomal and vesicular structures and extensive cytoskeletal reorganization. This paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

Nephrotic kidney diseases are characterized by proteinuria caused by dysfunction of the glomerular filtration barrier. Here, we perform an ultrastructural analysis of anti-nephrin–mediated podocytopathy by visualizing the near-native slit diaphragm in situ across defined stages of disease progression using cryo-electron tomography. Our analysis shows that at early disease stages punctuate cell–cell membrane approximations appear, with basal membrane apposition between adjacent podocyte foot processes, while the initially planar, fishnet slit diaphragm progressively bends into a dome-shaped configuration towards the urinary space. At later stages, slit diaphragm disappearance coincides with the appearance of endosomal and vesicular structures and extensive cytoskeletal reorganization. These cryo-electron tomography–based observations provide a structural framework for understanding how antibody binding to nephrin translates into podocyte architectural failure.
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Abstract Nephrotic kidney diseases are characterized by proteinuria caused by dysfunction of the glomerular filtration barrier. Here, we perform an ultrastructural analysis of anti-nephrin–mediated podocytopathy by visualizing the near-native slit diaphragm in situ across defined stages of disease progression using cryo-electron tomography. Our analysis shows that at early disease stages punctuate cell–cell membrane approximations appear, with basal membrane apposition between adjacent podocyte foot processes, while the initially planar, fishnet slit diaphragm progressively bends into a dome-shaped configuration towards the urinary space. At later stages, slit diaphragm disappearance coincides with the appearance of endosomal and vesicular structures and extensive cytoskeletal reorganization. These cryo-electron tomography–based observations provide a structural framework for understanding how antibody binding to nephrin translates into podocyte architectural failure. Competing Interest Statement The authors have declared no competing interest.

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