[No authors listed]
The let-7 microRNA (miRNA) regulates developmental timing at the larval-to-adult transition in Caenorhabditis elegans. Dysregulation of let-7 results in irregular hypodermal and vulval development. Disrupted let-7 function is also a feature of human lung cancer. However, little is known about the mechanism and co-factors of let-7. Here we demonstrate that ribosomal protein RPS-14 is able to modulate let-7 function in C. elegans. The RPS-14 protein co-immunoprecipitated with the nematode Argonaute homolog, ALG-1. Reduction of rps-14 gene expression by suppressed the aberrant vulva and hypodermis development phenotypes of let-7(n2853) mutant animals and the mis-regulation of a reporter bearing the lin-41 3'UTR, a well established let-7 target. Our results indicate an interactive relationship between let-7 miRNA function and ribosomal protein RPS-14 in regulation of terminal differentiation that may help in understanding the mechanism of translational control by miRNAs.
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