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Heterokaryon Technique for Analysis of Cell Type-specific Localization
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RNA localization mechanisms transcend cell morphology.

Raeann Goering1,2, Ankita Arora1, Megan C Pockalny1

  • 1Department of Biochemistry and Molecular Genetics, University of Colorado Anschutz Medical Campus, Aurora, United States.

Elife
|March 3, 2023
PubMed
Summary
This summary is machine-generated.

RNA localization mechanisms are conserved across different cell types. Specific RNA motifs can drive localization to basal regions in epithelial cells and neurites in neuronal cells, involving LARP1 and kinesin-1.

Keywords:
RNA localizationRNA traffickingTOP motifchromosomesgene expressiongeneticsgenomicshumanmouse

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • RNA localization to specific subcellular regions is crucial for cell function.
  • Mechanisms of RNA localization are often cell-type specific.
  • Understanding conserved RNA localization mechanisms is essential.

Purpose of the Study:

  • To investigate transcriptome-wide RNA spatial distributions in human intestinal epithelial cells.
  • To identify conserved RNA elements and proteins regulating RNA localization across different cell morphologies.
  • To determine if RNA/RBP interactions can predict RNA localization in diverse cell types.

Main Methods:

  • Halo-seq, a novel RNA proximity labeling technique.
  • Reporter transcript assays and single-molecule RNA fluorescence in situ hybridization (FISH).
  • Subcellular RNA sequencing data comparison between neuronal and epithelial cells.

Main Results:

  • mRNAs encoding ribosomal proteins (RP mRNAs) were found to localize to the basal pole of epithelial cells.
  • Pyrimidine-rich motifs in the 5' UTRs of RP mRNAs were sufficient to drive basal localization in epithelial cells and neurite localization in neuronal cells.
  • LARP1 perturbation abolished motif-driven localization, and kinesin-1 inhibition reduced it, indicating conserved regulatory roles.

Conclusions:

  • Identified the first RNA element regulating RNA localization across the apicobasal axis in epithelial cells.
  • Established LARP1 as a key regulator of RNA localization.
  • Demonstrated that RNA localization mechanisms are conserved across morphologically distinct cell types, suggesting shared transport pathways.