Mammalian microRNAs: experimental evaluation of novel and previously annotated genes
Abstract
MicroRNAs (miRNAs) are small regulatory RNAs that derive from distinctive hairpin transcripts. To learn more about the miRNAs of mammals, we sequenced 60 million small RNAs from mouse brain, ovary, testes, embryonic stem cells, three embryonic stages, and whole newborns. Analysis of these sequences confirmed 398 annotated miRNA genes and identified 108 novel miRNA genes. More than 150 previously annotated miRNAs and hundreds of candidates failed to yield sequenced RNAs with miRNA-like features. Ectopically expressing these previously proposed miRNA hairpins also did not yield small RNAs, whereas ectopically expressing the confirmed and newly identified hairpins usually did yield small RNAs with the classical miRNA features, including dependence on the Drosha endonuclease for processing. These experiments, which suggest that previous estimates of conserved mammalian miRNAs were inflated, provide a substantially revised list of confidently identified murine miRNAs from which to infer the general features of mammalian miRNAs. Our analyses also revealed new aspects of miRNA biogenesis and modification, including tissue-specific strand preferences, sequential Dicer cleavage of a metazoan precursor miRNA (pre-miRNA), consequential 5′ heterogeneity, newly identified instances of miRNA editing, and evidence for widespread pre-miRNA uridylation reminiscent of miRNA regulation by Lin28.
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miR-1274a, miR-1937b, miR-1937c, miR-2134 and miR-2182 are actually tRNA fragments instead of mature miRNAs.
“miR-1274a, miR-1937b, miR-1937c, miR-2134 and miR-2182 were included in the commercial TaqMan rodent miRNA arrays that we used but turn out to actually represent tRNA fragments instead of mature miRNAs [20].”
From Distinct repertoires of microRNAs present in mouse astrocytes compared to astrocyte-secreted exosomes (2017) · cites this paper as [20]
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- Authors
- Chiang, H. R., Schoenfeld, L. W., Ruby, J. G., Auyeung, V. C., Spies, N., Baek, D., Johnston, W. K., Russ, C., Luo, S., Babiarz, J. E., Blelloch, R., Schroth, G. P., Nusbaum, C., & Bartel, D. P.
- Venue
- Genes & Development
- Publisher
- Cold Spring Harbor Laboratory
- Published
- 2010-04-22
- Volume
- 24
- Issue
- 10
- Pages
- 992-1009
- ISSN
- 0890-9369
- 1549-5477
- Cited by
- 732
- References
- 7
- Language
- en
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