Transcriptome analysis indicates considerable divergence in alternative splicing between duplicated genes in...

Area of Science:

• Plant genomics
• Molecular evolution
• Gene regulation

Background:

• Gene and genome duplication create new plant genes.
• Alternative splicing (AS) generates diverse mRNA and protein isoforms.
• AS can influence gene expression and protein function.

Purpose of the Study:

• Investigate conservation of alternative splicing patterns between duplicated genes in Arabidopsis thaliana.
• Determine the extent of qualitative and quantitative divergence in AS between paralogs.
• Assess the role of AS in expression level divergence and nonsense-mediated decay (NMD).

Main Methods:

• RNA sequencing (RNA-seq) to analyze AS patterns.
• Comparison of AS events in whole-genome and tandem duplicates.
• Analysis of published RNA-seq data from NMD mutants.

Main Results:

• 30-33% of AS events are qualitatively conserved between duplicated genes.
• Significant quantitative divergence in AS frequencies between paralogs.
• 85-89% of duplicates show diverged AS-induced NMD pathways.

Conclusions:

• Alternative splicing patterns diverge significantly between duplicated genes.
• Qualitatively conserved AS events often exhibit quantitative divergence.
• AS divergence may contribute to regulating expression level differences between paralogs.