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Learn MoreNutrient deprivation triggers stringent response in bacteria, allowing rapid reallocation of resources from proliferation toward stress survival. Critical to this process is the accumulation of (p)ppGpp regulated by the RelA/SpoT homologues. While mammalian genomes encode MESH1the homologue of the bacterial (p)ppGpp hydrolase SpoT, neither (p)ppGpp nor its synthetase has been identified in mammalian cells. Therefore, the function of MESH1 remains a mystery. Here, we report that genetic removal of MESH1 from human cell induce an extensive transcriptional response. The changes are distinct from the canonical unfolding protein response but strongly resemble the bacterial stringent response, which induce cell proliferation arrest, implicating MESH1 in a previously uncharacterized stress response in human cells. SOURCE: Jen-Tsan,Ashley,Chi (jentsan.chi@duke.edu) - Jen-Tsan Ashley Chi Duke University
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