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The non-coding RNA SVALKA locus produces a cis-natural antisense transcript that negatively regulates the expression of CBF1 and biomass production at normal temperatures

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Plant Communications 2023年第4期4卷 77-87页

作者： Vasiliki Zacharaki Shiv Kumar Meena peter kindgren UmeåPlant Science Centre Department of Forest Genetics and Plant PhysiologySwedish University of Agricultural Sciences90187 Umea°Sweden

Non-coding transcription is present in all eukaryotic genomes,but we lack fundamental knowledge about its importance for an organism’s ability to develop *** plants,emerging evidence highlights the essential biological role of non-coding transcription in the regulation of coding ***,we have few molecular insights into this ***,we show that a long isoform of the long noncoding RNA SVALKA-L(SVK-L)forms a natural antisense transcript to the host gene CBF1 and negatively regulates CBF1 mRNA levels at normal temperatures in the model plant Arabidopsis ***,we show detailed evidence for the specific mode of action of *** pathway includes the formation of double-stranded RNA that is recognized by the DICER proteins and subsequent downregulation of CBF1 mRNA ***,the CBF1-SVK regulatory circuit is not only important for its previously known role in cold temperature acclimation but also for biomass production at normal *** study characterizes the developmental role of SVK-L and offers mechanistic insight into how biologically important overlapping natural antisense transcripts can act on and fine-tune the steady-state levels of their host gene’s mRNA.

关键词： SVALKA cis-natural antisense transcript non-coding transcription CBF1 Arabidopsis

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Interplay between HEAT SHOCK PROTEIN 90 and HY5 Controls PhANG Expression in Response to the GUN5 Plastid Signal

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Molecular Plant 2012年第4期5卷 901-913页

作者： peter kindgren Louise Noren Juan de Dios Barajas Lopez Jehad Shaikhali Asa Strand Umea Plant Science Centre Department of Plant Physiology Umea University S-901 87 Umea Sweden

The presence of genes encoding organellar proteins in different cellular compartments necessitates a tight coordination of expression by the different genomes of the eukaryotic cell. This coordination of gene expression is achieved by organelle-to-nucleus or retrograde communication. Stress-induced perturbations of the tetrapyrrole pathway trigger large changes in nuclear gene expression in plants. Recently, we identified HSP90 proteins as ligands of the pu- tative plastid signal Mg-ProtolX. In order to investigate whether the interaction between HSP90 and Mg-ProtolX is bio- logically relevant, we produced transgenic lines with reduced levels of cytosolic HSP90 in wild-type and gun5 backgrounds. Our work reveals that HSP90 proteins respond to the tetrapyrrole-mediated plastid signal to control expres- sion of photosynthesis-associated nuclear genes （PhANG） during the response to oxidative stress. We also show that the hy5 mutant is insensitive to tetrapyrrole accumulation and that Mg-ProtolX, cytosolic HSP90, and HY5 are all part of the same signaling pathway. These findings suggest that a regulatory complex controlling gene expression that includes HSP90 proteins and a transcription factor that is modified by tetrapyrroles in response to changes in the environment is evolutionarily conserved between yeast and plants.

关键词： abiotic/environmental stress cell signaling organelle biogenesis/function.

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