The mammalian LINC complex regulates genome transcriptional responses to substrate rigidity

SG Alam, Q Zhang, N Prasad, Y Li, S Chamala… - Scientific reports, 2016 - nature.com
SG Alam, Q Zhang, N Prasad, Y Li, S Chamala, R Kuchibhotla, B Kc, V Aggarwal
Scientific reports, 2016nature.com
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 …
Abstract
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.
nature.com