SPAG5 and cystic kidney disease: Analyses indicated 13 genes, in addition to Nek8 and Ift20 within this area that could potentially result in cystic kidney disease, namely: RGD1309077Phf12, Flot2, Spag5, Sdf2, Supt6h, Proca1, Traf4, Sarm1, Nlk and Ksr1 (Additional file 1: Table S1).