Developmental defects by antisense-mediated inactivation of micro-RNAs 2 and 13 in Drosophila and the identification of putative target genes
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Updated: Sep 20, 2026
RNAi Interference by dsRNA Injection into Drosophila Embryos
Published on: April 11, 2011
Alexandra Boutla1, Christos Delidakis, Martin Tabler
1Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology, Hellas, PO Box 1527, GR-71110 Heraklion/Crete, Greece.
Abstract:
Micro-RNAs are a class of small non-coding regulatory RNAs that impair translation by imperfect base pairing to mRNAs. For analysis of their cellular function we injected different miRNA-specific DNA antisense oligonucleotides in Drosophila embryos. In four cases we observed severe interference with normal development, one had a moderate impact and six oligonucleotides did not cause detectable phenotypes. We further used the miR-13a DNA antisense oligonucleotide as a PCR primer on a cDNA library template. In this experimental way we identified nine Drosophila genes, which are characterised by 3' untranslated region motifs that allow imperfect duplex formation with miR-13 or related miRNAs. These genes, which include Sos and Myd88, represent putative targets for miRNA regulation. Mutagenesis of the target motif of two genes followed by transfection in Drosophila Schneider 2 (S2) cells and subsequent reporter gene analysis confirmed the hypothesis that the binding potential of miR-13 is inversely correlated with gene expression.
Insights
Researchers investigated micro-RNAs (miRNAs) in Drosophila development using antisense oligonucleotides. They identified nine genes targeted by miR-13, confirming miRNA regulation
Area of Science:
- Developmental Biology
- Molecular Genetics
- RNA Biology
Background:
- Micro-RNAs (miRNAs) are small non-coding RNAs regulating gene expression post-transcriptionally.
- miRNAs function by imperfect base pairing to messenger RNAs (mRNAs), inhibiting translation.
- Understanding miRNA targets is crucial for deciphering their cellular roles.
Purpose of the Study:
- To investigate the cellular function of specific miRNAs in Drosophila development.
- To identify novel Drosophila genes targeted by microRNA regulation, particularly miR-13.
- To experimentally validate the interaction between miR-13 and its putative target genes.
Main Methods:
- Injection of miRNA-specific DNA antisense oligonucleotides into Drosophila embryos.
- Use of miR-13a DNA antisense oligonucleotide as a PCR primer to screen a cDNA library.
- Reporter gene assays in Drosophila Schneider 2 (S2) cells following mutagenesis of target motifs.
Main Results:
- Four DNA antisense oligonucleotides caused severe developmental defects, one caused moderate defects, and six had no observable effect.
- Nine Drosophila genes with 3' untranslated region motifs capable of imperfect duplex formation with miR-13 were identified.
- Reporter gene analysis confirmed that miR-13 binding potential inversely correlates with gene expression, validating target identification.
Conclusions:
- DNA antisense oligonucleotides are effective tools for probing miRNA function in vivo.
- Several novel Drosophila genes, including Sos and Myd88, are putative targets of miR-13-mediated regulation.
- The study provides experimental evidence for miRNA-mRNA interactions and their impact on gene expression regulation in Drosophila.
