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Learn MoreActins and regulators of actin dynamics generate contractile forces providing major mechanical and structural support for the cell. Whether and how they actively participate in cell fate control is not clear. Here, we report the actin responsive transcription factor complex MKL1/SRF, the major transcriptional regulator of large numbers of actin cytoskeletal genes, as an important regulator of genomic accessibility and cell fate outcome. Somatic cells with weaker MKL1/SRF activity progress toward pluripotency efficiently while sustained MKL1/SRF activity at a level seen in typical fibroblasts is sufficient to stall cells on their trajectory toward pluripotency. This altered cell fate outcome is associated with an overactive actin cytoskeleton, which connects to chromatin via the LINC complex, preventing its conversion into a relaxed, open conformation that allows sufficient accessibility to pluripotency-inducing transcription factors. Interfering with actin polymerization at appropriate times promotes pluripotency induction. Thus, we reveal a previously unappreciated aspect of cell fate control exerted by the actin based cytoskeletal system. SOURCE: Xiao Hu (nphujiaxiao@gmail.com) - Yale University
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