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Related Concept Videos

Regulated mRNA Transport02:22

Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Nuclear Export01:42

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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Nuclear Export of mRNA02:31

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Types of RNA01:23

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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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RNA Editing02:23

RNA Editing

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Updated: Jan 10, 2026

Extremely Rapid and Specific Metabolic Labelling of RNA In Vivo with 4-Thiouracil Ers4tU
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Pseudouridine selects RNAs for extracellular transport.

Alessandro Scacchetti1, Emily J Shields1, Lauren N Reich1

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Researchers discovered how cells package RNA into extracellular vesicles for intercellular communication. Pseudouridine modification and the protein MYL6 are key to this RNA export process in neurons.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Neuroscience

Background:

  • Extracellular RNAs (exRNAs) mediate intercellular communication, particularly in the nervous system.
  • Mechanisms governing the specific loading and transport of RNAs into extracellular vesicles (EVs) remain largely unknown.

Purpose of the Study:

  • To identify molecular factors regulating the export of RNAs into extracellular vesicles from neuronal cells.
  • To elucidate the role of RNA modification in extracellular RNA trafficking.

Main Methods:

  • Genome-wide CRISPR screening in a neuronal cell line.
  • Proteomics and high-sensitivity transcriptomics.
  • Biochemical assays to assess RNA modification and protein-RNA interactions.

Main Results:

  • Identified domesticated retroviral proteins and RNA-modifying enzymes involved in EV-mediated RNA transport.
  • Pseudouridine synthase 1 (PUS1) and its product, pseudouridine, are critical for extracellular RNA export.
  • Myosin light chain 6 (MYL6) acts as a pseudouridine-binding protein essential for RNA secretion.

Conclusions:

  • RNA chemical modification, specifically pseudouridylation, is a key determinant of extracellular RNA export.
  • A novel biochemical code links RNA modification to transport via EVs.
  • Established a framework for investigating exRNA function in the nervous system and other tissues.