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microRNAs play critical roles in the survival and recovery of Caenorhabditis elegans from starvation-induced L1 diapause

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The numbers on each image indicate how many worms of the examined ones displayed the indicated phenotype. (Right panels) The gonad of the same animals in the Left panels to indicate the similar developmental stage. (A) Differential interference contrast (DIC) images showing L4 worms recovered from 4-d–starved L1 worms.

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  • However, when newly hatched L1 worms encounter an environment with no food, developmental programs arrest and the worm enters L1 diapause.
  • (B) Bar graph showing the correlation between the severity of the retarded vulval precursor cell (VPC) timing defect of mir-71(lf) mutants and the duration of L1 starvation.
  • This result is consistent with the observation that miR-71 is specifically required for the starvation-induced stress response (Fig. S5).
  • These results indicate that miR-71 plays a significant role in larval development of animals recovering from L1 diapause and likely does so by regulating the expression of components of the insulin receptor/DAF-16 pathway, as well as factors acting downstream, or in parallel to, DAF-16.
  • However, we found that the reporter transgene with the lin-42 3′UTR was significantly repressed in wild-type worms, but derepressed in the mir-71(lf) worms (Fig. 4 H and I).
  • Note that the daf-16(lf) worms recovering from 3 d of L1 starvation displayed a ∼12-h delay in overall development and that the mir-71(lf); daf-16(lf) double mutants displayed an ∼24-h delay.

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