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Human TRIM71 and Its Nematode Homologue Are Targets of let-7 MicroRNA and Its Zebrafish Orthologue Is Essential for Development
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Human TRIM71 and Its Nematode Homologue Are Targets of let-7 MicroRNA and Its Zebrafish Orthologue Is Essential for Development
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Human TRIM71 and Its Nematode Homologue Are Targets of let-7 MicroRNA and Its Zebrafish Orthologue Is Essential for Development
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Journal Article
Human TRIM71 and Its Nematode Homologue Are Targets of let-7 MicroRNA and Its Zebrafish Orthologue Is Essential for Development
2007
Overview
Animal microRNAs (miRNAs) are short RNAs that function as posttranscriptional regulators of gene expression by binding to the target mRNAs. Noting that some miRNAs are highly conserved in evolution, we explored the possibility of evolutionary conservation of their targets. We identified human orthologues of experimentally verified let-7 miRNA target genes in Caenorhabditis elegans and used the luciferase reporter system to examine whether these human genes are still the targets of let-7 miRNA. We found that in some cases, the miRNA-target relationship has indeed been conserved in human. Interestingly, human TRIM71, an orthologue of C. elegans let-7-target lin-41 gene, can be repressed by hsa-let-7a and hsa-let-7c. This repression was abolished when both predicted let-7 target sites of TRIM71 were mutated. Moreover, the zebrafish lin-41 orthologue was also repressed by let-7 to a similar degree as was TRIM71. When the expression of zebrafish lin-41 orthologue was silenced by microinjection of RNA interference or morpholino into zebrafish zygotes, retarded embryonic development was observed, providing direct evidence for an essential role of lin-41 in zebrafish development. Taken together, our results suggest that the regulation of TRIM71 expression by let-7 has been evolutionarily conserved and that TRIM71 likely plays an important role in development. [PUBLICATION ABSTRACT]
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