Abstract
MicroRNAs (miRNAs) are a class of short (∼22-nt) noncoding RNA molecules that downregulate expression of their mRNA targets. Since their discovery as regulators of developmental timing in Caenorhabditis elegans, hundreds of miRNAs have been identified in both animals and plants1. Here, we report a technique for visualizing detailed miRNA expression patterns in mouse embryos. We elucidate the tissue-specific expression of several miRNAs during embryogenesis, including two encoded by genes embedded in homeobox (Hox) clusters, miR-10a and miR-196a. These two miRNAs are expressed in patterns that are markedly reminiscent of those of Hox genes. Furthermore, miR-196a negatively regulates Hoxb8, indicating that its restricted expression pattern probably reflects a role in the patterning function of the Hox complex.
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Acknowledgements
We thank S. Dymecki for plasmids; A. Abney and L. Du for pronuclear injections of the transgenes; members of the laboratories of C.J.T., C. Cepko, S. Dymecki and P.A.S. for discussions and advice; and A. Brent for critical reading of the manuscript. This work was supported by a grant from the March of Dimes to C.J.T., and by a US National Institutes of Health MERIT award and grants from the National Cancer Institute to P.A.S. J.H.M. and M.T.M. are supported by postdoctoral fellowships from the National Institutes of Health and the Cancer Research Institute, respectively.
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Mansfield, J., Harfe, B., Nissen, R. et al. MicroRNA-responsive 'sensor' transgenes uncover Hox-like and other developmentally regulated patterns of vertebrate microRNA expression. Nat Genet 36, 1079–1083 (2004). https://doi.org/10.1038/ng1421
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DOI: https://doi.org/10.1038/ng1421
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