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Transcriptome response study of arabidopsis wild type (Col6-3), gun1-9 mutant and MORF2 overexpression lines to norflurazon treatment in retrograde signaling

ABSTRACT: Transcriptome response study of arabidopsis wild type (Col6-3), gun1-9 mutant and MORF2 overexpression lines to norflurazon treatment in retrograde signaling

PROVIDER: PRJNA432917 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6671170.fastq.gz	Fastqsanger.gz
	SRR6671171.fastq.gz	Fastqsanger.gz
	SRR6671172.fastq.gz	Fastqsanger.gz
	SRR6671173.fastq.gz	Fastqsanger.gz
	SRR6671164.fastq.gz	Fastqsanger.gz

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Transcriptome response study of arabidopsis wild type (Col6-3), gun1-9 mutant and MORF2 overexpression lines to norflurazon treatment in retrograde signaling

Project description:Analysis of transcriptome response of norflurazon treated or untreated 5-day old whole seedlings with genotypes: Col6-3 (wild type), gun1-9 and MORF2 overexpression lines. GUN1 and MORF2 are involved in chloroplast-to-nucleus retrograde signaling. Results provide insight into the nuclear genes expression profile under control of GUN1 retrograde pathways and the regulation similarity between gun1-9 and MORF2 overexpression lines.

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Project description:Plastid gene expression (PGE) acts as a signal that regulates the expression of photosynthesis-associated nuclear genes (PhANGs) via GENOMES UNCOUPLED1 (GUN1)-dependent retrograde signaling. We recently isolated Arabidopsis sugar-inducible cotyledon yellow-192 (sicy-192), a gain-of-function mutant of plastidic invertase (INV-E), and showed that following the treatment of this mutant with sucrose, the expression of PhANGs decreased while that of nitrate reductase 1 (NIA1) increased. Plastid-encoded RNA polymerase (PEP)-dependent PGE was markedly suppressed in the sicy-192 mutant by the sucrose treatment. A double mutant of sicy-192 and gun1-101, a null mutant of GUN1, revealed that metabolic perturbation in the sucrose-treated sicy-192 mutant was, at least in part, dependent on GUN1. To confirm whether there is a relationship between plastid sugar metabolism and nuclear gene expression, we performed a microarray analysis using Suc-treated 3 genotypes consisting of wild-type, sicy-192, and sicy-192 gun1-101 plants.

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Expression data from Arabidopsis wild-type, sicy-192, and sicy-192 gun1-101 plants

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Functional relationship of GUN1 and FUG1 in plastid proteostasis

Project description:GUN1 integrates retrograde signals in the chloroplast but the underlying mechanism is elusive. FUG1, a chloroplast translation initiation factor, and GUN1 are co-expressed at the transcript level, and FUG1 co-immunoprecipitates with GUN1. We used mutants of GUN1 (gun1-103) and FUG1 (fug1-3) to analyse their functional relationship at the physiological and systems-wide level, the latter including transcriptome and proteome analyses. Absence of GUN1 aggravates the effects of decreased FUG1 levels on chloroplast protein translation, resulting in transient additive phenotypes with respect to photosynthesis, leaf coloration, growth and cold acclimation. Variegation of the var2 mutant is enhanced by gun1-103 in terms of increasing the fraction of white sectors, in contrast to fug1-3 that acts as suppressor. The transcriptomes of fug1-3 and gun1-103 are very similar, but absence of GUN1 alone has almost no effects on protein levels, whereas chloroplast protein accumulation is markedly decreased in fug1-3. In gun1 fug1 double mutants, effects on transcriptomes and particularly proteomes are enhanced. Our results show that GUN1 function becomes critical when chloroplast proteostasis is perturbed by decreased translation (fug1) or degradation (var2) of chloroplast proteins. The functions of FUG1 and GUN1 appear to be related, corroborating the view that GUN1 operates in chloroplast proteostasis.

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