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Solanum

ABSTRACT: Identification of alternative splicing events by RNA sequencing in tomato

PROVIDER: PRJNA286151 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR2064660.fastq.gz	Fastqsanger.gz
	SRR2064660_1.fastq.gz	Fastqsanger.gz
	SRR2064660_2.fastq.gz	Fastqsanger.gz
	SRR2064670.fastq.gz	Fastqsanger.gz
	SRR2064670_1.fastq.gz	Fastqsanger.gz

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A Ralstonia solanacearum effector targets splicing factor SR34a to reprograms alternative splicing and regulates host immunity

Project description:Alternative splicing (AS) is a critical post-transcriptional regulatory mechanism in eukaryotes. While infection with Ralstonia solanacearum GMI1000 significantly alters plant AS patterns, the underlying molecular mechanisms remain unclear. Herein, we investigate the effects of GMI1000 Type III secretion system (T3SS) effector proteins on AS in the tomato cultivar Heinz 1706. RNA sequencing (RNA-seq) confirmed genome-wide AS changes induced by the T3SS in tomato, in-cluding 1386 differential alternative splicing events in 1023 differentially alternatively spliced genes, many of which are associated with plant defense. Seven nucleus-localized Type III effec-tors(T3Es) were transiently expressed in an RLPK splicing reporter system transgenic tobacco, identifying RipP2 as an effector that modulates AS levels. Sequence analysis, protein-protein in-teraction assays, and AlphaFold2 structural predictions revealed that RipP2 interacts with the tomato splicing factor SR34a.Furthermore, RipP2 acetylates a conserved lysine at position 132 within the SWQDLKD motif of SR34a, regulating its splicing pattern in defense-related genes and modulating plant immunity. This study elucidates how the "Rip-SR34a module" influences plant immune responses by regulating the alternative splicing of immune-related genes, providing new insights into the molecular mechanisms of pathogen-plant interactions, particularly in splicing regulation.

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Project description:Alternative splicing is a molecular process that contributes greatly to the diversification of proteome and to gene functions. Understanding the mechanisms of stage-specific alternative splicing can provide a better understanding of the development of eukaryotes and the functions of different genes. Schistosoma japonicum is an infectious blood-dwelling trematode with a complex lifecycle that causes the tropical disease schistosomiasis. In this study, we analyzed the transcriptome of Schistosoma japonicum to discover alternative splicing events in this parasite, by applying RNA-seq to cDNA library of adults and schistosomula. Results were validated by RT-PCR and sequencing. We found 11,623 alternative splicing events among 7,099 protein encoding genes and average proportion of alternative splicing events per gene was 42.14%. We showed that exon skip is the most common type of alternative splicing events as found in high eukaryotes, whereas intron retention is the least common alternative splicing type. BioProject accession number is PRJNA290970, and the SRA Study accession number is SRP061588. Mixed sample of cDNA libaraies of Schistosomula and adult were sequenced using Illumina HiSeq2000.

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