Heterozygosity analysis of polycystic kidney disease 1 gene microsatellite markers for linkage analysis of autosomal dominant polycystic kidney disease type 1 in the Iranian population

Abstract

Background: Autosomal dominant polycystic kidney disease (ADPKD) is the most common genetic cause of end?stage renal disease. Although imaging techniques are a means of accurate diagnosis when the cysts appear in the third or fourth decades of the patient’s life, they are of little value for early diagnosis. Genetic tests are required for preimplantation genetic diagnosis, decision?making for kidney donation to an a?ected relative. Although  mutation of the polycystic kidney disease (PKD1) gene is solely  responsible for the most cases of ADPKD, direct genetic testing is limited  by the large size of this gene and the presence of many mutations without hot spots. Terefore, indirect diagnosis with linkage analysis using  informative microsatellite markers has been suggested. Materials and Methods: In this study, we assessed the informativeness of the PKD1 gene markers D16S475, D16S291, and D16S3252 in Iranian population. Using specifc primers, ?uorescent polymerase chain reaction (PCR) was  performed on genomic DNA extracted from ffty unrelated individuals. PCR products were analyzed by the ALFexpress DNA sequencer system, and the number and frequency of alleles were determined to calculate the heterozygosity (HET) and polymorphism information content (PIC) values.
Results: We found that the HET and PIC values for the D16S475 marker are 0.92 and 0.91, respectively. Tese two values are 0.82 and 0.80 for  D16S291 and 0.50 and 0.47 for D16S3252, respectively. Conclusion: Based on this data, D16S475 and D16S291 are highly and D16S3252 is  moderately informative for indirect genetic diagnosis of PKD1 mutations in this population.