Genetic Insights into Nephrotic Syndrome Variants

Nephrotic syndrome is defined by heavy proteinuria, hypoalbuminaemia, oedema and hyperlipidaemia, reflecting disruptions of the glomerular filtration barrier. Genetic studies have revealed over 60 implicated genes, many encoding podocyte-specific proteins essential for cytoskeletal integrity, cell adhesion and slit diaphragm assembly. Through exome sequencing, functional assays and animal models, research has clarified how monogenic and oligogenic variants influence age of onset, histopathology and treatment response, paving the way for precision diagnostics and personalised therapies.

Research from Nature Portfolio

A functional network linking MAGI2, TNS2, DLC1, CDK20, ITSN1 and ITSN2 has been shown to regulate RhoA and Cdc42 activity in podocyte migration and survival. Disruption of this module by patient-derived mutations impairs cytoskeletal dynamics, while steroid treatment modulates RhoA signalling, suggesting a mechanistic basis for variable drug responsiveness.

Recessive mutations in FAT1 were found to cause a combined glomerulotubular nephropathy characterised by podocyte foot process effacement and tubular lumen defects. Loss of FAT1 impairs RAC1/CDC42 activation, and administration of small GTPase activators partially rescues migration defects, identifying a targetable pathway.

Comprehensive screening of Japanese patients with severe proteinuria revealed monogenic variants in 30% of cases, predominantly affecting WT1, NPHS1, INF2, TRPC6 and LAMB2. Monogenic status predicted lower rates of complete remission under immunosuppression, underscoring the value of genetic diagnosis for treatment stratification.

Genetic Insights into Nephrotic Syndrome Variants publication trend

The graph below shows the total number of articles in genetic insights into nephrotic syndrome variants across all publications each year (not limited to Nature Index journals).

Technical terms

Podocyte: Highly specialised epithelial cell enveloping glomerular capillaries, crucial for filtration barrier integrity.

Slit diaphragm: Specialized cell–cell junction between podocyte foot processes acting as a size-selective sieve.

Focal segmental glomerulosclerosis (FSGS): Scarring affecting segments of some glomeruli, often secondary to podocyte injury.

Steroid-resistant nephrotic syndrome (SRNS): Subtype of nephrotic syndrome unresponsive to standard glucocorticoid therapy.

Monogenic: Disease caused by pathogenic variants in a single gene following Mendelian inheritance.

References

1. Mutations in six nephrosis genes delineate a pathogenic pathway amenable to treatment. Nature Communications (2018).
2. FAT1 mutations cause a glomerulotubular nephropathy. Nature Communications (2016).
3. Comprehensive genetic diagnosis of Japanese patients with severe proteinuria. Scientific Reports (2020).
4. Effects of a novel ANLN E841K mutation associated with SRNS on podocytes and its mechanism. Cell Communication and Signaling (2023).
5. Anti-slit diaphragm antibodies on kidney biopsy identify pediatric patients with steroid-resistant nephrotic syndrome responsive to second-line immunosuppressants. Kidney International (2024).
6. Estimation of the Age of the Kashubian‐Specific Pathogenic NPHS2 Variant Responsible for Hereditary Steroid‐Resistant Nephrotic Syndrome Points to Its Recent Local Origin. Human Mutation (2024).