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Plant miRNA regulation is environmentally and developmentally-sensitive

Patrick von Born, View ORCID ProfileIgnacio Rubio-Somoza
doi: https://doi.org/10.1101/136762
Patrick von Born
1Department of Molecular Biology, Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany.
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Ignacio Rubio-Somoza
1Department of Molecular Biology, Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany.
2Molecular Reprogramming and Evolution Laboratory, Centre for Research in Agricultural Genomics, 08193 Barcelona, Spain.
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  • ORCID record for Ignacio Rubio-Somoza
  • For correspondence: ignacio.rubio@cragenomica.es
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Abstract

Development and fitness of any organism rely on properly controlled gene expression. This is especially true for plants, as their development is determined by both internal and external cues. MicroRNAs (miRNAs) are embedded in the genetic cascades that integrate and translate those cues into developmental programs. miRNAs negatively regulate their target genes mainly post-transcriptionally through two co-existing mechanisms; mRNA cleavage and translational inhibition. It is unclear whether the efficiency of miRNA-guided regulation is generally influenced by factors like ambient temperature or developmental stage. Here we show that plant miRNA accumulation, as well as miRNAs’ mode of action can be temperature- and development-sensitive. Higher temperatures tend to induce a more pronounced accumulation of mature miRNAs. Both parameters have also an impact on the expression patterns of the core players involved in miRNA performance. We show that efficiency of miRNA-mediated gene silencing declines with age during vegetative development in a temperature-dependent manner. Co-existence of cleavage and translational inhibition was also found to be dependent on temperature and developmental stage. Therefore, each miRNA family specifically regulates their respective targets, while temperature and growth influence the performance of miRNA-dependent regulation in a more general way.

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Posted May 15, 2017.
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Plant miRNA regulation is environmentally and developmentally-sensitive
Patrick von Born, Ignacio Rubio-Somoza
bioRxiv 136762; doi: https://doi.org/10.1101/136762
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Plant miRNA regulation is environmentally and developmentally-sensitive
Patrick von Born, Ignacio Rubio-Somoza
bioRxiv 136762; doi: https://doi.org/10.1101/136762

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