Pol II docking and pausing at growth and stress genes in C. elegans.
Fluctuations in nutrient availability profoundly impact gene expression. Previous work revealed postrecruitment regulation of RNA polymerase II (Pol II) during starvation and recovery in Caenorhabditis elegans, suggesting that promoter-proximal pausing promotes rapid response to feeding. To test this hypothesis, we measured Pol II elongation genome wide by two complementary approaches and analyzed elongation in conjunction with Pol II binding and expression. We confirmed bona fide pausing during starvation and also discovered Pol II docking. Pausing occurs at active stress-response genes that become downregulated in response to feeding. In contrast, "docked" Pol II accumulates without initiating upstream of inactive growth genes that become rapidly upregulated upon feeding. Beyond differences in function and expression, these two sets of genes have different core promoter motifs, suggesting alternative transcriptional machinery. Our work suggests that growth and stress genes are both regulated postrecruitment during starvation but at initiation and elongation, respectively, coordinating gene expression with nutrient availability.
Published Version (Please cite this version)
Maxwell, Colin S, William S Kruesi, Leighton J Core, Nicole Kurhanewicz, Colin T Waters, Caitlin L Lewarch, Igor Antoshechkin, John T Lis, et al. (2014). Pol II docking and pausing at growth and stress genes in C. elegans. Cell Rep, 6(3). pp. 455–466. 10.1016/j.celrep.2014.01.008 Retrieved from https://hdl.handle.net/10161/10399.
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The Baugh Lab is interested in phenotypic plasticity and physiological adaptation to variable environmental conditions. We are using the roundworm C. elegans to understand how animals adapt to starvation using primarily genetic and genomic approaches. We are studying how development is governed by nutrient availability, how animals survive starvation, and the long-term consequences of starvation including adult disease and transgenerational epigenetic inheritance.
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