Present address: European Commission, Directorate-General for Research, Directorate E - Biotechnology, Agriculture and Food Research, B-1049 Brussels, Belgium.
The miRNA156/157 recognition element in the 3′ UTR of the Arabidopsis SBP box gene SPL3 prevents early flowering by translational inhibition in seedlings
Article first published online: 8 JAN 2007
The Plant Journal
Volume 49, Issue 4, pages 683–693, February 2007
How to Cite
Gandikota, M., Birkenbihl, R. P., Höhmann, S., Cardon, G. H., Saedler, H. and Huijser, P. (2007), The miRNA156/157 recognition element in the 3′ UTR of the Arabidopsis SBP box gene SPL3 prevents early flowering by translational inhibition in seedlings. The Plant Journal, 49: 683–693. doi: 10.1111/j.1365-313X.2006.02983.x
- Issue published online: 8 JAN 2007
- Article first published online: 8 JAN 2007
- Received 23 June 2006; revised 11 September 2006; accepted 11 October 2006.
- SBP box gene;
- post-transcriptional regulation
miRNAs are a class of versatile small RNAs that control gene expression post-transcriptionally, governing many facets of plant cell functions. They interact with their target mRNA at a site of sequence complementarity and modulate their expression levels. Here, we provide evidence, based on transient assays and stable transgenic lines, that the 3′ UTR of the Arabidopsis SBP box gene SPL3 contains a functional miRNA-responsive element (MRE) that is complementary to miR156 and miRNA157. Seedlings of transgenic lines constitutively over-expressing an SPL3 transgene either carrying an unaltered or a disrupted MRE accumulate considerable levels of SPL3 transcripts. However, while the unaltered MRE UTR does not allow the expression of detectable levels of SPL3 protein, the altered MRE does. Translational inhibition thus provides an important mechanism for miRNA-mediated post-transcriptional repression of SPL3. As a consequence of precocious translation of the constitutively expressed SPL3 transgene, due to the absence of a functional MRE, plants exhibit very early flowering in addition to frequent morphological changes.