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Genome-wide assessment of AU-rich elements by the AREScore algorithm
Milan Spasic1, Caroline C Friedel, Johanna Schott
1Helmholtz Junior Research Group Posttranscriptional Control of Gene Expression, German Cancer Research Center, DKFZ-ZMBH Alliance, Heidelberg, Germany.
Plos Genetics
|January 14, 2012
Summary
AU-rich elements (AREs) regulate gene expression by degrading messenger RNA (mRNA). A new algorithm, AREScore, effectively identifies AREs and predicts mRNA stability in Drosophila.
Area of Science:
- Molecular Biology
- Genomics
- Post-transcriptional Regulation
Background:
- AU-rich elements (AREs) are regulatory sequences in the 3' untranslated region (UTR) of short-lived mRNAs.
- AREs control gene expression by promoting rapid mRNA degradation at the post-transcriptional level.
Purpose of the Study:
- To develop an algorithm (AREScore) for identifying and quantifying the strength of AREs.
- To investigate the evolutionary selection and functional significance of AREs in metazoan species, particularly Drosophila melanogaster.
Main Methods:
- Developed the AREScore algorithm based on ARE features like AUUUA pentamers and surrounding regions.
- Analyzed AREScore distribution across 14 metazoan transcriptomes.
- Measured genome-wide mRNA expression and degradation rates in Drosophila SL2 cells, including knockdown of the Tis11 protein.
Main Results:
- Provided evidence for ARE selection in vertebrates and Drosophila.
- Demonstrated that the AREScore algorithm accurately predicts mRNA degradation rates.
- Showed a correlation between high AREScores, reduced mRNA expression, and the targeting of ARE-containing mRNAs by Tis11 in Drosophila.
Conclusions:
- AREScore is a valuable tool for identifying ARE-containing mRNAs.
- AREs are widespread and functionally important regulatory elements in Drosophila, controlling mRNA stability and gene expression.
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