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Splicing-Mediated Autoregulation Modulates Rpl22p Expression in Saccharomyces cerevisiae
Jason Gabunilas1, Guillaume Chanfreau1,2
1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California, United States of America.
Rpl22p protein inhibits splicing of its own pre-mRNA (RPL22B) through a stem-loop structure. This autoregulatory mechanism fine-tunes Rpl22p levels based on cellular ribosome biogenesis needs.
Area of Science:
- Molecular Biology
- Gene Regulation
- Yeast Genetics
Background:
- Ribosomal protein genes (RPGs) are highly expressed in Saccharomyces cerevisiae and tightly regulated.
- Precise gene-by-gene regulation of RPG pre-mRNA splicing remains incompletely understood.
Purpose of the Study:
- To investigate the regulatory mechanisms of ribosomal protein pre-mRNA splicing.
- To elucidate the extraribosomal functions of Rpl22p in gene expression regulation.
Main Methods:
- In vivo and in vitro splicing assays.
- Analysis of pre-mRNA secondary structures.
- Assessment of U1 snRNP recruitment.
Main Results:
- Rpl22p inhibits splicing of RPL22B pre-mRNA via a stem-loop structure in the intron.
- This inhibition involves reduced co-transcriptional U1 snRNP recruitment.
- RPL22B splicing inhibition down-regulates mature transcript levels under stress and during suppressed ribosome biogenesis.
Conclusions:
- Rpl22p exhibits an autoregulatory role in fine-tuning its own expression.
- This mechanism adjusts Rpl22p levels and paralog composition according to ribosome biogenesis demands.
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