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Methods to Study PAMP-Triggered Immunity in Brassica Species

ABSTRACT: Methods to Study PAMP-Triggered Immunity in Brassica Species

PROVIDER: PRJEB4549 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR338493.fastq.gz	Fastqsanger.gz
	ERR338494.fastq.gz	Fastqsanger.gz
	ERR338495.fastq.gz	Fastqsanger.gz
	ERR338496.fastq.gz	Fastqsanger.gz
	ERR338497.fastq.gz	Fastqsanger.gz

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PAMP-triggered genetic reprogramming involves widespread alternative transcription initiation and an immediate transcription factor wave

Project description:Immune responses triggered by pathogen-associated molecular patterns (PAMPs) are key to pathogen defense, but drivers and stabilizers of the growth-to-defense genetic reprogramming remain incompletely understood in plants. Here, we report a time-course study of the establishment of PAMP-triggered immunity (PTI) using cap analysis of gene expression. We show that around 15% of all transcription start sites (TSSs) rapidly induced during PTI define alternative transcription initiation events. From these, we identify clear examples of regulatory TSS change via alternative inclusion of target peptides or domains in encoded proteins, or of upstream open reading frames in mRNA leader sequences. We also find that 60% of PAMP response genes respond earlier than previously thought. In particular, a cluster of rapidly and transiently PAMP-induced genes is enriched in transcription factors (TFs) whose functions, previously associated with biological processes as diverse as abiotic stress adaptation and stem cell activity, appear to converge on growth restriction. Furthermore, examples of known potentiators of PTI, in one case under direct mitogen-activated protein kinase control, support the notion that the rapidly induced TFs could constitute direct links to PTI signaling pathways and drive gene expression changes underlying establishment of the immune state.

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Role of MPK4 in pathogen-associated molecular pattern-triggered alternative splicing in Arabidopsis

Project description:Alternative splicing (AS) of pre-mRNAs in plants is an important mechanism of gene regulation in environmental stress tolerance but plant signals involved are essentially unknown. Pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) is mediated by mitogen-activated protein kinases and the majority of PTI defense genes are regulated by MPK3, MPK4 and MPK6. These responses have been mainly analyzed at the transcriptional level, however many splicing factors are direct targets of MAPKs. Here, we studied alternative splicing induced by the PAMP flagellin in Arabidopsis.

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