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Exserohilum turcicum strain:15St008 | isolate:15St008

ABSTRACT: Genome sequencing, annotation, and gene expression of a sorghum-specific Exserohilum turcicum strain to study host-specificity

PROVIDER: PRJNA1187604 | ENA |

REPOSITORIES: ENA

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			Action	DRS
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	SRR31414353_subreads.fastq.gz	Fastqsanger.gz

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Gene expression of sorghum-specific Exserohilum turcicum strain

Project description:Exserohilum turcicum is a fungal pathogen that causes northern corn leaf blight and sorghum leaf blight. However, strains are host-specific, meaning a strain typically only causes disease on either maize or sorghum. This pathosystem provides a unique opportunity to identify the mechanisms underlying host specificity through genomic and transcriptomic studies. To characterize host specificity, we (i) constructed de novo annotated assemblies of one sorghum- (15St008) and one maize-specific (Et52B) E. turcicum strain, ii) identified and characterized structural changes between the two genomes, and (iii) compared differential gene expression. This GEO project contains the gene expression of the sorghum-specific strain (15St008) during in planta infection of sorghum and in axenic cultures.

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Exserohilum turcicum strain:Et52B | isolate:Et52B

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Project description:Some pathogen-derived effectors reprogram mRNA splicing in their host plant to regulate plant immune responses. The fungus Exserohilum turcicum is the causal agent of northern corn leaf blight, a damaging maize (Zea mays) disease. However, the low efficiency of genetic transformation of E. turcicum has hampered research on its effectors and whether E. turcicum effectors interfere with RNA splicing remained unknown. Here, using an alternative splicing (AS) reporter system, we identified the secreted protein EtEC81 (Exserohilum turcicum effector 81), which modulates the AS of maize pre-mRNAs and negatively regulates the pathogenicity of E. turcicum. EtEC81 physically interacts with EtEC81-interactiNG protein 1 (ZmEIP1), which associates with maize spliceosome components, regulating AS and positively regulating the defense response against E. turcicum. EtEC81 binding further enhanced the effect of ZmEIP1 on AS. Transcriptome analysis revealed 119 common genes with altered AS in maize plants transiently overexpressing ZmEIP1 or EtEC81, suggesting that these factors cause the mis-regulation of cellular activities and thus induce immune responses. We used RT-qPCR to verify representative AS events in the plants transiently overexpressing ZmEIP1 and EtEC81. Together, our results suggest that the EtEC81 effector targets ZmEIP1 to reprogram pre-mRNA splicing in maize.

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