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This study examines how C. elegans worms coordinate two key developmental processes—molting (shedding their outer cuticle) and cell divisions—during larval growth. Researchers found that when insulin signaling is reduced, cell divisions are delayed more than molting, causing temporary desynchronization between these events. However, the delayed cell divisions trigger a compensatory delay in the next molting stage, creating a mechanism that resynchronizes development at the start of each larval stage.
Why it matters
This research reveals how organisms maintain coordination between different developmental processes despite environmental or genetic perturbations. Understanding these compensatory mechanisms could inform research on developmental timing disorders and how organisms adapt to stress conditions like nutrient scarcity.
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by Francisco Javier Romero-Expósito, Almudena Moreno-Rivero, Marta Muñoz-Barrera, Nicola Gritti, Francesca Sartor, Martha Merrow, Jeroen S. van Zon, Alejandro Mata-Cabana, María Olmedo
In multicellular organisms, development entails the progression of diverse cellular processes that need to be temporally coordinated. During Caenorhabditis elegans postembryonic development, the events of molting and cell divisions progress in parallel during four larval stages and are modulated by external cues such as temperature and nutrient availability. While seam cell divisions occur predominantly before ecdysis of the cuticle, the order of the events can change, suggesting that they are controlled by independent mechanisms. Here, we have analyzed the impact of reduced insulin signaling on molting and in stage-specific cell divisions. We find that reduced insulin signaling in the daf-2(e1370) allele delays both events but has a larger impact on the timing of cell divisions, thus increasing the desynchrony between the events. The relative delay in seam cell divisions leads to a delay in the initiation of the subsequent stage of the molting program, providing a mechanism for resynchronization of developmental processes at the beginning of the larval stages.