{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNPHS2 encodes podocin, a critical membrane protein expressed exclusively in glomerular podocytes that localizes to the slit diaphragm—a specialized intercellular junction essential for maintaining the glomerular filtration barrier. Podocin interacts directly with nephrin and other adapter proteins, integrating into lipid raft microdomains and contributing to the assembly and stabilization of the slit diaphragm complex. This partnership is necessary for proper signaling and structural integrity of the podocyte filtration apparatus, a finding supported by several in vitro and in vivo studies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMechanistic investigations have revealed that disease‐causing NPHS2 mutations disturb podocin’s normal biosynthetic trafficking. Many mutations result in defective oligomerization, misfolding and subsequently its retention in the endoplasmic reticulum rather than proper delivery to the plasma membrane. These defects disrupt podocin’s ability to recruit nephrin into lipid rafts and to interact appropriately with the actin cytoskeleton, ultimately impairing intracellular signaling cascades that maintain the slit diaphragm structure. Furthermore, specific variants such as R229Q have been shown to alter podocin’s binding characteristics, which may modify its interactions with nephrin and contribute to the development of proteinuric phenotypes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nExtensive genotype–phenotype analyses have established NPHS2 mutations as a major cause of autosomal recessive steroid‐resistant nephrotic syndrome and focal segmental glomerulosclerosis. The deleterious mutations not only correlate with an early disease onset and rapid progression toward end‐stage renal disease but also delineate distinctive patient subgroups, with some variants (or compound heterozygous conditions) manifesting later or milder phenotypes. Additional studies have underscored that even heterozygous coding variants may modulate disease severity and interact with mutations in other glomerular genes, contributing to the heterogeneity observed in nephrotic syndrome patients."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "30"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMoreover, population‐based and familial studies have broadened our understanding of NPHS2’s role by revealing how genetic background, racial differences, and potential modifiers influence the presentation and progression of proteinuric kidney diseases. These insights reinforce the importance of molecular screening for NPHS2 mutations in patients with unexplained steroid resistance and highlight potential therapeutic avenues aimed at correcting trafficking defects. Together, these findings underscore podocin’s multifaceted role in preserving podocyte architecture and normal renal function, while also establishing NPHS2 as a pivotal target for both diagnostic and novel treatment strategies in nephrotic syndrome."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "31", "end_ref": "40"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Carolin E Sadowski, Svjetlana Lovric, Shazia Ashraf, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Nephrotic syndrome in the first year of life: two thirds of cases are caused by mutations in 4 genes (NPHS1, NPHS2, WT1, and LAMB2)."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Pediatrics (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1542/peds.2006-2164"}], "href": "https://doi.org/10.1542/peds.2006-2164"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17371932"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17371932"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Stefanie Weber, Olivier Gribouval, Ernie L Esquivel, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Molecular basis of the functional podocin-nephrin complex: mutations in the NPHS2 gene disrupt nephrin targeting to lipid raft microdomains."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Mol Genet (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/hmg/ddg360"}], "href": "https://doi.org/10.1093/hmg/ddg360"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "14570703"}], "href": "https://pubmed.ncbi.nlm.nih.gov/14570703"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Ania Koziell, Victor Grech, Sagair Hussain, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Genotype/phenotype correlations of NPHS1 and NPHS2 mutations in nephrotic syndrome advocate a functional inter-relationship in glomerular filtration."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Mol Genet (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/hmg/11.4.379"}], "href": "https://doi.org/10.1093/hmg/11.4.379"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11854170"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11854170"}]}, {"type": "r", "ref": 7, "children": [{"type": "t", "text": "Gianluca Caridi, Roberta Bertelli, Alba Carrea, et al. 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