Statistical analysis supports pervasive RNA subcellular localization and alternative 3' UTR regulation
Rob Bierman1, Jui M Dave2, Daniel M Greif2
1Department of Biochemistry Stanford University, Stanford, United States.
Elife
|December 19, 2024
Summary
New statistical methods reveal widespread regulation of RNA localization by 3' Untranslated Region (UTR) processing in the mouse brain. This finding suggests a more pervasive role for 3' UTRs in controlling subcellular RNA distribution than previously understood.
Area of Science:
- Molecular Biology
- Genomics
- Neuroscience
Background:
- Subcellular RNA localization is crucial for cellular functions like polarization and translocation.
- RNA isoform expression, particularly 3' Untranslated Region (UTR) regulation, is linked to RNA localization.
- Genome-wide spatial transcriptomics offers new potential to study in situ RNA localization.
Purpose of the Study:
- To develop robust statistical measures for subcellular localization and alternative poly-adenylation (APA) at single-cell resolution.
- To investigate cell-type specific regulation of RNA subcellular localization and its correlation with 3' UTR processing.
- To explore the pervasive nature of RNA localization regulation in the mouse brain and liver.
Main Methods:
- Developed a novel statistical framework named SPRAWL (Spatial RNA analysis With Localization).
- Integrated SPRAWL with a new method to measure cell-type specific alternative 3' UTR processing.
- Applied these methods to single-cell resolved spatial transcriptomics data from mouse brain and liver.
Main Results:
- Detected extensive cell-type specific subcellular RNA localization regulation in the mouse brain.
- Observed significant correlations between 3' UTR length and subcellular localization in specific cell types.
- Identified examples (Timp3, Slc32a1, Cxcl14, Nxph1) where 3' UTR processing, including unannotated 3' ends, correlates with subcellular localization in the brain.
Conclusions:
- SPRAWL provides a statistical framework to integrate multi-omic, single-cell measurements for studying gene-isoform pairs.
- The study prioritizes candidate functional 3' UTRs for further investigation.
- 3' UTR regulation of subcellular RNA localization is predicted to be more pervasive than currently known, especially in the mouse brain.
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