Figure 2. Characterization of the genes involved in the pyrimidine metabolism pathway as aging-related genes. (A–C) The effect of (A) dpyd-1 RNAi (red) and (B) upp-1 RNAi (red) on lifespan. (C) Lifespan of wild-type N2 exposed to control, dhod-1 RNAi, and dhod-1 RNAi with orotate supplementation. Lifespan values of repetitions are listed in Supplementary Table 1. (D) dhod-1, dpyd-1, and upp-1 RNA levels in whole worms after treatment of C. elegans with RNAi against dhod-1, dpyd-1 and upp-1, respectively, versus control RNAi. (mean ± SD, n=3, *** P<0.001, Student’s t test).