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A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
Published on: September 15, 2021
A splicing-independent function of SF2/ASF in microRNA processing
1Department of Cell Biology, Duke University Medical Center, Durham, NC 27708, USA.
Molecular Cell
|April 14, 2010
Summary
The splicing factor SF2/ASF regulates microRNA-7 (miR-7) processing, forming a negative feedback loop where SF2/ASF promotes miR-7 and miR-7 represses SF2/ASF. This reveals a novel role for splicing factors in microRNA biogenesis.
Area of Science:
- Molecular Biology
- Gene Regulation
Background:
- Splicing factors and microRNAs are crucial for posttranscriptional gene regulation.
- SF2/ASF is a key splicing factor involved in gene expression control.
Purpose of the Study:
- To investigate the relationship between splicing factor SF2/ASF and microRNA expression.
- To elucidate the regulatory mechanisms involving SF2/ASF and microRNAs.
Main Methods:
- miRNA deep sequencing to identify differentially expressed miRNAs.
- Analysis of SF2/ASF interaction with pri-miRNA transcripts.
- Luciferase assays to confirm targeting of SF2/ASF 3'UTR by miR-7.
Main Results:
- Overexpression of SF2/ASF led to differential expression of 40 miRNAs, including miR-7.
- SF2/ASF directly promotes miR-7 maturation by facilitating Drosha cleavage.
- Mature miR-7 targets the 3'UTR of SF2/ASF, inhibiting its translation, establishing a negative feedback loop.
- SF2/ASF also regulates other miRNAs like miR-221 and miR-222 via a similar mechanism.
Conclusions:
- SF2/ASF plays a significant role in pri-miRNA processing, independent of its splicing function.
- A novel negative feedback loop exists between SF2/ASF and miR-7.
- This highlights the interplay between splicing regulation and miRNA-mediated gene repression in complex gene networks.
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