Mechanotransduction via the LINC complex regulates DNA replication in myonuclei

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  • Shuoshuo Wang
    Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel 1
  • Elizabeth Stoops
    Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel 1
  • Unnikannan CP
    Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel 1
  • Barak Markus
    G-INCPM/Mantoux Institute for Bioinformatics, Weizmann Institute of Science, Rehovot, Israel 2
  • Adriana Reuveny
    Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel 1
  • Elly Ordan
    Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel 1
  • Talila Volk
    Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel 1

Description

<jats:p>Nuclear mechanotransduction has been implicated in the control of chromatin organization; however, its impact on functional contractile myofibers is unclear. We found that deleting components of the linker of nucleoskeleton and cytoskeleton (LINC) complex in Drosophila melanogaster larval muscles abolishes the controlled and synchronized DNA endoreplication, typical of nuclei across myofibers, resulting in increased and variable DNA content in myonuclei of individual myofibers. Moreover, perturbation of LINC-independent mechanical input after knockdown of β-Integrin in larval muscles similarly led to increased DNA content in myonuclei. Genome-wide RNA-polymerase II occupancy analysis in myofibers of the LINC mutant klar indicated an altered binding profile, including a significant decrease in the chromatin regulator barrier-to-autointegration factor (BAF) and the contractile regulator Troponin C. Importantly, muscle-specific knockdown of BAF led to increased DNA content in myonuclei, phenocopying the LINC mutant phenotype. We propose that mechanical stimuli transmitted via the LINC complex act via BAF to regulate synchronized cell-cycle progression of myonuclei across single myofibers.</jats:p>

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