Background: Alport Syndromes (AS) are the second leading genetic cause of Kidney Failure (KF). Whether multiple kidney cysts (MKC) phenotype belongs to the AS spectrum remains debated.
Methods: This multicenter retrospective study focused on patients genotyped with pathogenic COL4A3, COL4A4, or COL4A5 variants (classified as ACMG-AMP 4 or 5) between January 2011 and January 2023 across four French university hospitals.