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ABSTRACT: mRNA of host Trifolium repens L. in response to Cuscuta australis parasitism

PROVIDER: PRJNA700502 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13663981_1.fastq.gz	Fastqsanger.gz
	SRR13663981_2.fastq.gz	Fastqsanger.gz
	SRR13663982_1.fastq.gz	Fastqsanger.gz
	SRR13663982_2.fastq.gz	Fastqsanger.gz
	SRR13663983_1.fastq.gz	Fastqsanger.gz

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Project description:RNA-seq data of root samples from host Trifolium repens L. after Cuscuta australis parasitism.

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Subversion of host innate immunity by Rickettsia australis via a modified autophagic response in macrophages

Project description:We recently reported that the in vitro and in vivo survival of Rickettsia australis are Atg5-dependent, in association with an inhibited level of anti-rickettsial cytokine, IL-1β. In the present study, we sought to investigate how R. australis interacts with host innate immunity via an Atg5-dependent autophagic response. We found that the serum levels of IFN-γ and G-CSF in R. australis-infected Atg5flox/floxLyz-Cre mice were significantly less compared to Atg5flox/flox mice, accompanied by significantly lower rickettsial loads in tissues with inflammatory cellular infiltrations including neutrophils. R. australis infection differentially regulated a significant number of genes in bone marrow-derived macrophages (BMMs) in an Atg5-depdent fashion as determined by RNA sequencing and Ingenuity Pathway Analysis, including genes in the molecular networks of IL-1 family cytokines and PI3K-Akt-mTOR. The secretion levels of inflammatory cytokines, such as IL-1α, IL-18, TNF-α, and IL-6, by R. australis-infected Atg5flox/floxLyz-Cre BMMs were significantly greater compared to infected Atg5flox/flox BMMs. Interestingly, R. australis significantly increased the levels of phosphorylated mTOR and P70S6K at a time when the autophagic response is induced. Rapamycin treatment nearly abolished the phosphorylated mTOR and P70S6K but did not promote significant autophagic flux during R. australis infection. These results highlight that R. australis modulates an Atg5-dependent autophagic response, which is not sensitive to regulation by mTORC1 signaling in macrophages. Overall, we demonstrate that R. australis counteracts host innate immunity including IL-1β-dependent inflammatory response to support the bacterial survival via an mTORC1-resistant autophagic response in macrophages.

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Project description:Dodders (Cuscuta spp.) are obligate parasitic plants that obtain water and nutrients from the stems of host plants via specialized feeding structures called haustoria. Dodder haustoria facilitate bi-directional movement of viruses, proteins, and mRNAs between host and parasite, but the functional effects of these movements are not clear. Here we show that C. campestris haustoria accumulate high levels of many novel microRNAs (miRNAs) while parasitizing Arabidopsis thaliana hosts. Many of these miRNAs are 22 nts long, a usually rare size of plant miRNA associated with amplification of target silencing through secondary small interfering RNA (siRNA) production. Several A. thaliana mRNAs are targeted by C. campestris 22 nt miRNAs during parasitism, resulting in high levels of secondary siRNA production. The targeted mRNAs function in hormone perception, pathogen-defense signaling, phloem function, and stem-cell identity. Homologs of these target mRNAs from diverse plants also have high-confidence complementary sites to C. campestris miRNAs, suggesting that homologous mRNAs are targeted by C. campestris across its very broad host range. These data show that C. campestris miRNAs act as trans-species regulators of host gene expression, and suggest that they may act as virulence factors during parasitism.

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