Journal
PLANT REPRODUCTION
Volume 34, Issue 3, Pages 225-242Publisher
SPRINGER
DOI: 10.1007/s00497-021-00411-6
Keywords
Intron retention; Alternative splicing; Brassica rapa; Sexual reproduction; Pollen development; Isoform switching
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Funding
- ARC Discovery grant [DP0988972]
- McKenzie Fellowship
- Spartan HPC at the University of Melbourne, Australia
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Intron retention is a stage-specific mechanism that leads to functional attenuation of a subset of co-regulated, functionally related genes during early stages of pollen development. The modulation of protein levels in a plant developmental program is not induced by gene expression, but by the type of transcript produced. This mechanism may contribute to the stage-specific expression of a non-functional isoform of certain genes.
Key message Intron retention is a stage-specific mechanism of functional attenuation of a subset of co-regulated, functionally related genes during early stages of pollen development. To improve our understanding of the gene regulatory mechanisms that drive developmental processes, we performed a genome-wide study of alternative splicing and isoform switching during five key stages of pollen development in field mustard, Brassica rapa. Surprisingly, for several hundred genes (12.3% of the genes analysed), isoform switching results in stage-specific expression of intron-retaining transcripts at the meiotic stage of pollen development. In such cases, we report temporally regulated switching between expression of a canonical, translatable isoform and an intron-retaining transcript that is predicted to produce a truncated and presumably inactive protein. The results suggest a new pervasive mechanism underlying modulation of protein levels in a plant developmental program. The effect is not based on gene expression induction but on the type of transcript produced. We conclude that intron retention is a stage-specific mechanism of functional attenuation of a subset of co-regulated, functionally related genes during meiosis, especially genes related to ribosome biogenesis, mRNA transport and nuclear envelope architecture. We also propose that stage-specific expression of a non-functional isoform of Brassica rapa BrSDG8, a non-redundant member of histone methyltransferase gene family, linked to alternative splicing regulation, may contribute to the intron retention observed.
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