Abstract
To identify candidate genes responsible for hypertension in Dahl salt-sensitive rats (Dahl-S), an oligonucleotide microarray analysis was performed to find differentially expressed genes in kidneys of Dahl-S and Lewis rats. We obtained 101 F2 male rats from Dahl-S and Lewis rats and performed precise measurements of blood pressure (BP) and heart rate by telemetric monitoring at 14 weeks of age after 9 weeks of salt-loading. The correlation analysis between genotypes of differentially expressed genes and BP in F2 rats indicated that pyridoxine 5 ′-phosphate oxidase ( Pnpo) and catecholamine- O-methyltransferease ( Comt) showed a highly significant association with BP. However, in the case of Comt, the Dahl-S genotype correlated with low BP. Short/branched chain acyl-CoA dehydrogenase and Sah also showed a significant association with systolic blood pressure. The present study provided evidence that Pnpo is a candidate gene responsible for hypertension in Dahl-S rats.
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