WNT5A and Alport syndrome: We thank Dr. Andy McMahon (Eli & Edythe Broad CIRM Center for Regenerative Medicine and Stem Cell Research at USC, Los Angeles, CA, USA) for the Wnt4 and Wnt5a knock out mouse model and Dr. Arthur van den Wijngaard, Department of Clinical Genetics, Maastricht University Medical Centre Maastricht, The Netherlands for providing DNA samples of the Alport syndrome patients, Dr. L.M. de Kort who did the ultrasounds analysis and Johanna Kekolahti-Liias, Hannele Härkman, Paula Haipus and Minna Siurua for their technical assistance.