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Article Abstract
LIN28 protein and let-7 family micro RNAs (miRNAs) that are an evolutionarily conserved from nematodes to humans are the important regulators of developmental timing by dynamically interacting with each other. However, regulators of LIN28 remain largely elusive. Here, we show the evidences that Sjögren Syndrome antigen B (SSB) protein associates and cooperates with LIN28A and LIN28B, mammalian orthologues of Caenorhabditis elegans lin-28, proteins in the nucleus. Knockdown of SSB in HEK293 cell line resulted in the decrease of the amount of LIN28B mRNAs and proteins, and the increase of the level of mature let-7 miRNAs. Furthermore, RNA interference of ssb-1 gene, a worm SSB orthologue, was sufficient to cause a heterochronic defect in seam cells of C. elegans, recapitulating the phenotype of lin-28 downregulation. Collectively, we suggest that SSB is an important regulator for the LIN28-let-7 axis.
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| http://dx.doi.org/10.1016/j.bbagrm.2021.194684 | DOI Listing |
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