An artificial miRNA system reveals that relative contribution of translational inhibition to miRNA-mediated regulation depends on environmental and developmental factors in Arabidopsis thaliana
Von Born, Patrick (Max Planck Institute for Plant Breeding Research. Department of Plant-Microbe Interactions)
Bernardo-Faura, Martí (Centre de Recerca en Agrigenòmica)
Rubio-Somoza, Ignacio (Centre de Recerca en Agrigenòmica)

Fecha:	2018
Resumen:	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. Despite our increasing knowledge about the genetic and biochemical processes involved in those concurrent mechanisms, little is known about their relative contributions to the overall miRNA-mediated regulation. Here we show that co-existence of cleavage and translational inhibition is dependent on growth temperature and developmental stage. We found that efficiency of an artificial miRNA-mediated (amiRNA) gene silencing declines with age during vegetative development in a temperature-dependent manner. That decline is mainly due to a reduction on the contribution from translational inhibition. Both, temperature and developmental stage were also found to affect mature amiRNA accumulation and the expression patterns of the core players involved in miRNA biogenesis and action. Therefore, that suggests that each miRNA family specifically regulates their respective targets, while temperature and growth might influence the performance of miRNA-dependent regulation in a more general way.
Ayudas:	Ministerio de Economía y Competitividad RYC-2015-19154 Ministerio de Economía y Competitividad SEV-2015-0533 Ministerio de Economía y Competitividad BFU2014-58361-JIN
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	PloS one, Vol. 13 No. 2 (2018) , e0192984, ISSN 1932-6203

DOI: 10.1371/journal.pone.0192984
PMID: 29451902

14 p, 1.1 MB

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