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Genome-wide analysis of gene expression profiling revealed that COP9 signalosome is essential for correct expression of Fe homeostasis genes in Arabidopsis

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Abstract

In plant cells, either excess or insufficient iron (Fe) concentration triggers stress responses, therefore it is strictly controlled. Proteasome-mediated degradation through ubiquitination of Fe homeostasis proteins has just become the focus of research in recent years. Deactivating ubiquitin ligases, COP9 signalosome has a central importance in the translational control of various stress responses. The aim of the study was to investigate COP9 signalosome in Fe deficiency response of Strategy I plants. In silico analysis of a set of Fe-deficiency-responsive genes was conducted against the transcriptome of Arabidopsis csn mutant lines using Genevestigator software. Induced and suppressed genes were clustered in a hierarchical way and gene ontology enrichment categories were identified. In wild-type Arabidopsis, CSN genes did not respond to iron deficiency. In csn mutant lines, under Fe-sufficient conditions, hundreds of Fe-deficiency-responsive genes were misregulated. Among the ones previously characterized for their physiological roles under Fe deficiency IRT1, NAS4, BTS, NRAMP1 were down-regulated while AHA2, MTP8, FRD3 were up-regulated. Unexpectedly, from those which were regulated in opposite ways, some had been repeatedly shown to be tightly co-regulated by the same transcription factor, FIT. Two proteins from DELLA family, which were reported to interact with FIT to repress its downstream, were found to be strikingly repressed in csn mutants. Overall, the study underlined that the absence of a functional CSN greatly impacted the regulation of Fe homeostasis-related genes, in a manner which cannot be explained simply by the induction of the master transcription factor, FIT. Correct expression of Fe deficiency-responsive genes requires an intact COP9 signalosome in Arabidopsis.

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Acknowledgements

Seckin Eroglu thanks Scientific and Technological Council of Turkey (Ankara, Turkey) for the fellowship through BIDEB-2232 program (Project no: 116C059).

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  1. Department of Genetics and Bioengineering, Faculty of Engineering, İzmir University of Economics, Sakarya Cad., No: 156, Balcova, 35330, İzmir, Turkey

    Seckin Eroglu

  2. Department of Agricultural Genetic Engineering, Ayhan Sahenk Faculty of Agricultural Sciences and Technologies, Ömer Halisdemir University, Merkez, 51240, Nigde, Turkey

    Emre Aksoy

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  1. Seckin Eroglu
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Eroglu, S., Aksoy, E. Genome-wide analysis of gene expression profiling revealed that COP9 signalosome is essential for correct expression of Fe homeostasis genes in Arabidopsis. Biometals 30, 685–698 (2017). https://doi.org/10.1007/s10534-017-0036-8

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