Abstract
We use Caenorhabditis elegans to test proposed general rules for microRNA (miRNA)-target interactions. We show that G·U base pairing is tolerated in the 'seed' region of the lsy-6 miRNA interaction with its in vivo target cog-1, and that 6- to 8-base-pair perfect seed pairing is not a generally reliable predictor for an interaction of lsy-6 with a 3′ untranslated region (UTR). Rather, lsy-6 can functionally interact with its target site only in specific 3′ UTR contexts. Our findings illustrate the difficulty of establishing generalizable rules of miRNA-target interactions.
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Acknowledgements
We thank Q. Chen for expert technical assistance in generating transgenic strains, N. Rajewsky for stimulating discussions, I. Rigoutsos for suggestions about target predictions and R. Mann, F. Slack, I. Greenwald, P. Sengupta, I. Rigoutsos and N. Rajewsky for comments on the manuscript. This work was funded, in part, by US National Institutes of Health grants 1R03HD050334-01 and 5R01NS050266-02, a predoctoral US National Institutes of Health fellowship to D.D. and the Howard Hughes Medical Institute.
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Supplementary information
Supplementary Fig. 1
lsy-6 responsiveness of predicted lsy-6 target 3′ UTRs. (PDF 115 kb)
Supplementary Fig. 2
Conservation of seed matches to lsy-6 from C. elegans to C. briggsae. (PDF 114 kb)
Supplementary Table 1
Primers and transgenic arrays. (PDF 59 kb)
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Didiano, D., Hobert, O. Perfect seed pairing is not a generally reliable predictor for miRNA-target interactions. Nat Struct Mol Biol 13, 849–851 (2006). https://doi.org/10.1038/nsmb1138
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DOI: https://doi.org/10.1038/nsmb1138
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