(191k) The Mammalian Linc Complexregulates Genome Transcriptionalresponses to Substrate Rigidity

Authors: 
Zhang, Q., University of Florida
Alam, S., University of Florida-Gainesville
Li, Y., University of Florida
Kuchibhotla, R., University of Florida
Roux, K., Sanford Children's Health Research Center
Lele, T., University of Florida
Prasad, N., HudsonAlpha Institute of Biotechnology
KC, B., Sanford Children’s Health Research Center
Aggarwal, V., University of Florda
Shrestha, S., HudsonAlpha Institute of Biotechnology
Nickerson, J. A., University of Massachusetts Medical School
Mechanical integration of the nucleus with the extracellular matrix (ECM) is established by linkage between the cytoskeleton and the nucleus. This integration is hypothesized to mediate sensing of ECM rigidity, but parsing the function of nucleus-cytoskeleton linkage from other mechanisms has remained a central challenge. Here we took advantage of the fact that the LINC (linker of nucleoskeleton and cytoskeleton) complex is a known molecular linker of the nucleus to the cytoskeleton, and asked how it regulates the sensitivity of genome-wide transcription to substratum rigidity. We show that gene mechanosensitivity is preserved after LINC disruption, but reversed in direction. Combined with myosin inhibition studies, we identify genes that depend on nuclear tension for their regulation. We also show that LINC disruption does not attenuate nuclear shape sensitivity to substrate rigidity. Our results show for the first time that the LINC complex facilitates mechano-regulation of expression across the genome.