TTC21B and ciliopathy: The Renal proteinuria gene list corresponded to some genetic kidney diseases (CAKUT, tubulopathies, ciliopathies) that result in secondary FSGS such as Dent disease (CLCN5, OCRL), nephronophthisis (TTC21B, NPHP4), ADTKD-UMOD and Imerslund-Grasbeck syndrome 1 (CUBN).