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The lamin-like LITTLE NUCLEI 1 (LINC1) regulates jasmonic acid signaling and innate immunity

ABSTRACT: The lamin-like LITTLE NUCLEI 1 (LINC1) regulates jasmonic acid signaling and innate immunity

PROVIDER: PRJNA487051 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7726620_1.fastq.gz	Fastqsanger.gz
	SRR7726620_2.fastq.gz	Fastqsanger.gz
	SRR7726621_1.fastq.gz	Fastqsanger.gz
	SRR7726621_2.fastq.gz	Fastqsanger.gz
	SRR7726622_1.fastq.gz	Fastqsanger.gz

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The lamin-like LITTLE NUCLEI 1 (LINC1) regulates jasmonic acid signaling and innate immunity

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Project description:Pathogen-associated molecular pattern (PAMP) recognition occurs by plasma membrane located receptors that induce among other processes nuclear gene expression. However, signaling to the nuclear compartment is restricted by the nuclear envelope and nuclear pore complexes. We show here that among the four Arabidopsis lamin homologs LITTLE NUCLEI/CROWDED NUCLEI (LINC/CRWN), LINC1 plays an important role in PTI and jasmonic acid (JA) signaling. We show that linc1 knock out mutants affect PAMP-triggered MAPK activation and growth inhibition, but not reactive oxygen species or callose accumulation. We also demonstrate that linc1 mutants are compromised in regulating PAMP-triggered pathogen-related genes, in particular encoding factors involved in JA signaling and responses. Expression of a number of JAZ domain proteins, the key JA-related transcription factor MYC2 as well as key MYB transcription factors and biosynthesis genes of both the indole and aliphatic glucosinolate pathways are changed in linc1 mutants. Moreover, PAMP triggers JA and JA-Ile accumulation in linc1 mutants, whereas salicylic acid levels are unchanged. Despite impairment in PAMP-triggered immunity, linc1 mutants still show basal immunity towards Pseudomonas syringae DC3000 strains. High JA levels usually render plants resistant to necrotrophic pathogen. Thus, linc1 mutants show enhanced resistance to Botrytis cinerea infection. In accordance with a general role of LINC1 in JA signaling, linc1 mutants are hypersensitive to growth inhibition to external JA. In summary, our findings show that the lamin-like LINC1 protein plays a key role in JA signaling and regulation of PTI responses in Arabidopsis.

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Project description:Mutation of the LMNA gene, encoding nuclear lamin A and lamin C (hereafter lamin A/C), is a common cause of familial dilated cardiomyopathy (DCM). Among Finnish DCM patients, the founder mutation c.427T>C (p.S143P) is the most frequently reported genetic variant. Here, we show that p.S143P lamin A/C is more nucleoplasmic and soluble than wild-type lamin A/C and accumulates into large intranuclear aggregates in a fraction of cultured patient fibroblasts as well as in cells ectopically expressing either FLAG- or GFP-tagged p.S143P lamin A. In fluorescence loss in photobleaching (FLIP) experiments, non-aggregated EGFP-tagged p.S143P lamin A is significantly more dynamic. In in vitro association studies, p.S143P lamin A failed to form appropriate filament structures but instead assembled into disorganized aggregates similar to those observed in patient cell nuclei. A whole genome expression analysis revealed an elevated unfolded protein response (UPR) in cells expressing p.S143P lamin A/C. Additional endoplasmic reticulum (ER) stress induced by tunicamycin reduced the viability of mutant lamin expressing cells further. In summary, p.S143P lamin A/C affects normal lamina structure and influences the cellular stress response, homeostasis and viability. Total RNA obtained from 4 control and 7 patient cell lines

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