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Related Concept Videos

Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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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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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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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 Protein Sorting01:34

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
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Three-Dimensional Mapping of mRNA Export through the Nuclear Pore Complex.

Steven J Schnell1, Jiong Ma2, Weidong Yang3

  • 1Department of Biology, Temple University, Philadelphia, PA 19122, USA. sj.schnell@temple.edu.

Genes
|November 14, 2014
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Summary

Understanding mRNA export requires advanced 3D imaging. New techniques map messenger RNA (mRNA) dynamics within the nuclear pore complex (NPC) in live cells, revealing crucial export mechanisms.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Transcription and translation are separated by the nuclear envelope (NE) in eukaryotes.
  • Nuclear pore complexes (NPCs) regulate mRNA export from the nucleus to the cytoplasm.
  • The NPC channel's nanoscale dimensions limit conventional light microscopy for studying mRNA dynamics.

Purpose of the Study:

  • To highlight the need for 3D mapping techniques to understand mRNA export dynamics.
  • To review current 3D imaging approaches for studying nuclear export.
  • To present a novel 3D imaging approach for real-time mRNA dynamics in NPCs.

Main Methods:

  • Super-resolution fluorescence microscopy
  • Single-particle tracking (SPT)
  • 2D-to-3D deconvolution algorithms for 3D reconstruction

Main Results:

  • Demonstrated the necessity of 3D mapping for studying mRNA export.
  • Summarized the capabilities of existing 3D imaging techniques.
  • Elucidated new aspects of mRNA nuclear export using a combined SPT and deconvolution approach.

Conclusions:

  • Advanced 3D imaging techniques are essential for real-time mapping of mRNA dynamics.
  • The developed 3D imaging approach provides new insights into mRNA nuclear export mechanisms.
  • Overcoming the diffraction limit is crucial for understanding molecular transport through NPCs.