Publications
An Invasive Gene Regulatory Network and SWI/SNF Chromatin Remodeling: Insights from C. elegans Anchor Cell Invasion
Abstract
Cellular invasion through basement membranes (BM) is a critical step in metazoan development and is important for fitness. Atypical activation of invasive behavior requires dysregulation of the expression of pro-invasive transcription factors (TFs) and is associated with metastasis, one of the hallmarks of cancer. Cancer metastasis is also associated with mutations in subunits of chromatin regulating factors (CRFs), such as the SWItching defective/Sucrose NonFermenting (SWI/SNF) ATP-dependent chromatin remodeling complex, which coordinates metazoan development through broad regulation of chromatin accessibility and transcription. Here we utilize Caenorhabditis elegans anchor cell (AC) invasion as an in vivo model to both decode the transcription factor (TF) gene regulatory network (GRN) that governs AC specification and invasion and identify the suite of chromatin regulating factors (CRFs) that promote cellular invasiveness. We show that the AC expresses TFs common to metastatic cancers, namely, egl-43 (EVI1/MEL), fos-1 (FOS), hlh-2 (E/Daughterless), and nhr-67 (TLX/Tailless), initially to contribute to AC specification via regulation of LIN-12 (Notch). Following AC specification, these TFs are then recycled and cooperate together in two parallel subcircuits - cell cycle-independent and -dependent - which together activate pro-invasive gene expression and ensure G0 cell cycle arrest in the AC. Moreover, we characterize the SWI/SNF ATP-dependent chromatin remodeling complex as a critical regulator of the AC GRN and AC invasion, with pleiotropic effects on both the cell cycle-independent activation of invasive machinery and maintenance of G0 cell cycle arrest. The C. elegans AC therefore requires coordination of genome-wide chromatin remodelers and lineage-specific TFs to specify and breach the BM in vivo.
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