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Arabidopsis thaliana

ABSTRACT: Divergence of alternative splicing in Arabidopsis

PROVIDER: PRJNA299198 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR2728240_1.fastq.gz	Fastqsanger.gz
	SRR2728240_2.fastq.gz	Fastqsanger.gz
	SRR2728241_1.fastq.gz	Fastqsanger.gz
	SRR2728241_2.fastq.gz	Fastqsanger.gz
	SRR2728238_1.fastq.gz	Fastqsanger.gz

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Project description:We identified PRP4 kinase-A (PRP4ka) in a forward genetic screen based on an alternatively-spliced GFP reporter gene in Arabidopsis thaliana (Arabidopsis). Prp4 kinase, which was the first spliceosome-associated kinase shown to regulate splicing in fungi and mammals, has not yet been studied in plants. Analysis of RNA-seq data from the prp4ka mutant revealed widespread perturbations in alternative splicing. A quantitative iTRAQ-based phosphoproteomics investigation of the mutant identified phosphorylation changes in several serine/arginine-rich proteins, which regulate constitutive and alternative splicing, as well as other splicing-related factors. The results demonstrate the importance of PRP4ka in alternative splicing and suggest that PRP4ka may influence alternative splicing patterns by phosphorylating a subset of splicing regulators.

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RNA-seq analysis of alternative splicing between two Arabidopsis accessions and its inheritance in hybrid

Project description:To uncover the possible regulatory mechanism in regulatory alternative splicing in plants evolution, we used RNA-seq to compare the transcriptomes in Arabidopsis ecotypes Col and C24. We found different class of AS types have different regulatory mechanisms in Arabidopsis and divergence of alternative splicing in different class is varied in evolution. Sequence variation analysis had found evolution divergent AS events significantly altered their sequences compared to conserved events and the variation is AS class specific.

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Cis-regulated alternative splicing divergence and its potential contribution to environmental responses in Arabidopsis.

Project description:Alternative splicing (AS) plays key roles in plant development and responses to environmental changes. However, the mechanisms underlying AS divergence (differential expression of transcript isoforms resulting from alternative splicing) in plant accessions and its contributions to responses to environmental stimuli remain unclear. In this study, we investigated genome-wide variation of AS in Arabidopsis thaliana accessions Col-0, Bur-0, C24, Kro-0, and Ler-1, as well as their F1 hybrids, and characterized the regulatory mechanisms for AS divergence by RNA sequencing (RNA-seq). We found that most of the divergent AS events in Arabidopsis accessions were cis-regulated by sequence variation, including those in core splice site and splicing motifs. Many genes that differed in AS between Col-0 and Bur-0 were involved in stimulus responses. Further genome-wide association analyses of 22 environmental variables showed that SNPs influencing known splice site strength were also associated with environmental stress responses. These results demonstrate that cis-variation in genomic sequences among Arabidopsis accessions was the dominant contributor to AS divergence, and it may contribute to differences in environmental responses among Arabidopsis accessions.

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