They found disease-causing variants in podocytopathy genes typically associated with SRNS and FSGS in 19 patients (30%) as well as pathogenic mutations in phenocopy genes, including COL4A3–5 (Alport syndrome), CLCN5 (Dent disease), PAX2 (renal-coloboma syndrome), and GLA (Fabry disease), in 18 patients. This evidence concerns the gene COL4A3 and Alport syndrome.