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Plant mitochondrial phylogenomics

ABSTRACT: Angiosperm mitochondrial phylogenomics

PROVIDER: PRJEB33250 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR3412410_1.fastq.gz	Fastqsanger.gz
	ERR3412410_2.fastq.gz	Fastqsanger.gz
	ERR3412411_1.fastq.gz	Fastqsanger.gz
	ERR3412411_2.fastq.gz	Fastqsanger.gz
	ERR3412412_1.fastq.gz	Fastqsanger.gz

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Retrograde signalling during caused by heritable mitochondrial dysfunction is partly mediated by ANAC017 and improves plant performance.

Project description:Mitochondria are crucial for plant viability and are able to communicate information on their functional status to the cellular nucleus via retrograde signalling, thereby affecting gene expression. It is currently unclear if retrograde signalling in response to constitutive mitochondrial biogenesis defects is mediated by the same pathways as those triggered during acute mitochondrial dysfunction. Furthermore, it is unknown if retrograde signalling can effectively improve plant performance when mitochondrial function is constitutively impaired. Here we show that retrograde signalling in mutants defective in mitochondrial proteins RNA polymerase rpotmp or prohibitin atphb3 can be suppressed by knocking out the transcription factor ANAC017. Genome-wide RNA-seq expression analysis revealed that ANAC017 is almost solely responsible for the most dramatic transcriptional changes common to rpotmp and atphb3 mutants, regulating both classical marker genes such as alternative oxidase 1a (AOX1a) and also previously-uncharacterised DUF295 genes that appear to be new retrograde markers. In contrast, ANAC017 does not regulate intra-mitochondrial gene expression or transcriptional changes unique to either rpotmp or atphb3 genotype, suggesting the existence of currently unknown signalling cascades. The data show that the role of ANAC017 extends beyond common retrograde transcriptional responses and affects downstream protein abundance and enzyme activity of alternative oxidase, as well as steady state energy metabolism in atphb3 plants. Furthermore, detailed growth analysis revealed that ANAC017-dependent retrograde signalling provides benefits for growth and productivity in plants with mitochondrial defects. In conclusion, ANAC017 plays a key role in both biogenic and operational mitochondrial retrograde signalling, and improves plant performance when mitochondrial function is constitutively impaired.

2016-07-28 | E-MTAB-4655 | biostudies-arrayexpress

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