miRNAs mediate SnRK1-dependent energy signaling in Arabidopsis
The SnRK1 protein kinase, the plant ortholog of mammalian AMPK and yeast Snf1, is activated by the energy depletion caused by adverse environmental conditions. Upon activation, SnRK1 triggers extensive transcriptional changes to restore homeostasis and promote stress tolerance and survival partly th...
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doaj-f7b01dec582347e996fb7089bf3ec9442020-11-24T21:54:21ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2013-06-01410.3389/fpls.2013.0019746502miRNAs mediate SnRK1-dependent energy signaling in ArabidopsisAna eConfraria0Cláudia Sofia Dos Santos Martinho1Alexandre eElias2Ignacio eRubio-Somoza3Elena eBaena-González4Instituto Gulbenkian de CiênciaInstituto Gulbenkian de CiênciaInstituto Gulbenkian de CiênciaMax Planck Institute for Developmental BiologyInstituto Gulbenkian de CiênciaThe SnRK1 protein kinase, the plant ortholog of mammalian AMPK and yeast Snf1, is activated by the energy depletion caused by adverse environmental conditions. Upon activation, SnRK1 triggers extensive transcriptional changes to restore homeostasis and promote stress tolerance and survival partly through the inhibition of anabolism and the activation of catabolism. Despite the identification of a few bZIP transcription factors as downstream effectors, the mechanisms underlying gene regulation, and in particular gene repression by SnRK1, remain mostly unknown. microRNAs (miRNAs) are 20-24 nt RNAs that regulate gene expression post-transcriptionally by driving the cleavage and/or translation attenuation of complementary mRNA targets. In addition to their role in plant development, mounting evidence implicates miRNAs in the response to environmental stress. Given the involvement of miRNAs in stress responses and the fact that some of the SnRK1-regulated genes are miRNA targets, we postulated that miRNAs drive part of the transcriptional reprogramming triggered by SnRK1. By comparing the transcriptional response to energy deprivation between WT and dcl1-9, a mutant deficient in miRNA biogenesis, we identified 831 starvation genes misregulated in the dcl1-9 mutant, out of which 155 are validated or predicted miRNA targets. Functional clustering analysis revealed that the main cellular processes potentially co-regulated by SnRK1 and miRNAs are translation and organelle function and uncover TCP transcription factors as one of the most highly enriched functional clusters. TCP repression during energy deprivation was impaired in miR319 knockdown (MIM319) plants, demonstrating the involvement of miR319 in the stress-dependent regulation of TCPs. Altogether, our data indicates that miRNAs are components of the SnRK1 signaling cascade contributing to the regulation of specific mRNA targets and possibly tuning down particular cellular processes during the stress response.http://journal.frontiersin.org/Journal/10.3389/fpls.2013.00197/fullArabidopsismiRNAstressSnRK1energy signalingDCL1 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ana eConfraria Cláudia Sofia Dos Santos Martinho Alexandre eElias Ignacio eRubio-Somoza Elena eBaena-González |
spellingShingle |
Ana eConfraria Cláudia Sofia Dos Santos Martinho Alexandre eElias Ignacio eRubio-Somoza Elena eBaena-González miRNAs mediate SnRK1-dependent energy signaling in Arabidopsis Frontiers in Plant Science Arabidopsis miRNA stress SnRK1 energy signaling DCL1 |
author_facet |
Ana eConfraria Cláudia Sofia Dos Santos Martinho Alexandre eElias Ignacio eRubio-Somoza Elena eBaena-González |
author_sort |
Ana eConfraria |
title |
miRNAs mediate SnRK1-dependent energy signaling in Arabidopsis |
title_short |
miRNAs mediate SnRK1-dependent energy signaling in Arabidopsis |
title_full |
miRNAs mediate SnRK1-dependent energy signaling in Arabidopsis |
title_fullStr |
miRNAs mediate SnRK1-dependent energy signaling in Arabidopsis |
title_full_unstemmed |
miRNAs mediate SnRK1-dependent energy signaling in Arabidopsis |
title_sort |
mirnas mediate snrk1-dependent energy signaling in arabidopsis |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Plant Science |
issn |
1664-462X |
publishDate |
2013-06-01 |
description |
The SnRK1 protein kinase, the plant ortholog of mammalian AMPK and yeast Snf1, is activated by the energy depletion caused by adverse environmental conditions. Upon activation, SnRK1 triggers extensive transcriptional changes to restore homeostasis and promote stress tolerance and survival partly through the inhibition of anabolism and the activation of catabolism. Despite the identification of a few bZIP transcription factors as downstream effectors, the mechanisms underlying gene regulation, and in particular gene repression by SnRK1, remain mostly unknown. microRNAs (miRNAs) are 20-24 nt RNAs that regulate gene expression post-transcriptionally by driving the cleavage and/or translation attenuation of complementary mRNA targets. In addition to their role in plant development, mounting evidence implicates miRNAs in the response to environmental stress. Given the involvement of miRNAs in stress responses and the fact that some of the SnRK1-regulated genes are miRNA targets, we postulated that miRNAs drive part of the transcriptional reprogramming triggered by SnRK1. By comparing the transcriptional response to energy deprivation between WT and dcl1-9, a mutant deficient in miRNA biogenesis, we identified 831 starvation genes misregulated in the dcl1-9 mutant, out of which 155 are validated or predicted miRNA targets. Functional clustering analysis revealed that the main cellular processes potentially co-regulated by SnRK1 and miRNAs are translation and organelle function and uncover TCP transcription factors as one of the most highly enriched functional clusters. TCP repression during energy deprivation was impaired in miR319 knockdown (MIM319) plants, demonstrating the involvement of miR319 in the stress-dependent regulation of TCPs. Altogether, our data indicates that miRNAs are components of the SnRK1 signaling cascade contributing to the regulation of specific mRNA targets and possibly tuning down particular cellular processes during the stress response. |
topic |
Arabidopsis miRNA stress SnRK1 energy signaling DCL1 |
url |
http://journal.frontiersin.org/Journal/10.3389/fpls.2013.00197/full |
work_keys_str_mv |
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