Alexander van Oudenaarden and colleagues analyze the temporal dynamics of the Caenorhabditis elegans transcriptome, reporting that ~2,000 genes show periodic expression oscillations in synchrony with progression through larval stages. They characterize the expression dynamics of the microRNA lin-4 and its target lin-14 and suggest that a microRNA-mediated feed-forward circuit is required for efficient dampening of expression oscillations to maintain the temporal gradient of the microRNA target.
- Dong hyun Kim
- Dominic Grün
- Alexander van Oudenaarden