Survey of conserved alternative splicing events of mRNAs encoding SR proteins in land plants

Molecular Biology and Evolution
Kei Iida, Mitiko Go

Abstract

The serine/arginine-rich (SR) protein family plays an important role in constitutive and alternative splicing (AS). These proteins regulate AS in a tissue-specific and stress-responsive manner. Pre-mRNAs encoding SR proteins are often alternatively spliced, and these AS events may be important for the regulation of AS events of other pre-mRNAs. In this study, we analyzed AS events of SR proteins in Arabidopsis thaliana and Oryza sativa (rice). We found three sets of AS events conserved between Arabidopsis and rice. These conserved AS events were found in the plant-novel-SR protein, SC35-like (SCL), and two-Zn-knuckles-type 9G8 subfamilies. Each member of these subfamilies has at least one RNA recognition motif (RRM) and at least one intron in the RRM-encoded region. We found that the conserved AS events occurred in these introns and, in each case, the conserved AS events resulted in mature mRNAs encoding proteins with incomplete RRMs. To search for the evolutionary origin of these AS events, we analyzed SR proteins in Physcomitrella patens (moss) in addition to those in Arabidopsis and rice. We found moss homologues of the plant-novel-SR protein, SCL, and the two-Zn-knuckles-type 9G8 subfamilies in silico, and these homologues ...Continue Reading

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Citations

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