Autosomal dominant polycystic kidney disease (ADPKD) is one of the most frequently inherited renal diseases caused by mutations in PKD1 and PKD2. We performed mutational analyses of PKD genes in 49 unrelated patients using direct PCR-sequencing and multiplex ligation-dependent probe amplification (MLPA) for PKD1 and PKD2. RT-PCR analysis was also performed in a family with a novel PKD2 splicing mutation. The gene discussed is PKD2; the disease is autosomal dominant polycystic kidney disease.