Recent advances in understanding and treating nephrotic syndrome

Area of Science:

• Nephrology
• Genetics
• Immunology

Background:

• Idiopathic nephrotic syndrome (INS) is a common glomerular disease in children and adults, primarily affecting podocytes.
• Current treatments are empirical, with many patients showing resistance to steroids, leading to significant morbidity.
• Podocyte biology research has advanced significantly, offering new insights into disease mechanisms.

Purpose of the Study:

• To reclassify INS based on genetic and mechanistic understanding.
• To explore targeted therapies for different INS subtypes.
• To refine treatment strategies by distinguishing monogenic from immune-mediated forms.

Main Methods:

• Complete genetic analysis to identify causative single-gene defects.
• Deep clinical phenotyping for detailed patient characterization.
• Introduction of mechanism-derived biomarkers for clinical practice.

Main Results:

• At least 53 genes are known to cause monogenic INS.
• The majority of non-monogenic INS cases are likely immune-mediated.
• A third mechanistic group remains to be discovered.

Conclusions:

• INS can be reclassified into monogenic and other forms, guiding treatment.
• Minimizing immunosuppression in monogenic cases is crucial.
• Targeted therapies for podocyte injury are emerging and promising.