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Related Concept Videos

Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Directionality of Nuclear Transport01:42

Directionality of Nuclear Transport

Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
Regulated mRNA Transport02:22

Regulated mRNA Transport

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 specific...
Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
Nuclear Export01:42

Nuclear Export

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.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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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Related Experiment Video

Updated: May 25, 2026

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells
08:53

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells

Published on: May 16, 2017

Regulated nucleocytoplasmic transport during gametogenesis.

Yoichi Miyamoto1, Peter R Boag, Gary R Hime

  • 1Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia. Yoichi.Miyamoto@monash.edu

Biochimica Et Biophysica Acta
|February 14, 2012
PubMed
Summary

Nucleocytoplasmic transport is crucial for germ cell differentiation and fertility. Key transport molecules like importins and nucleoporins are essential for gamete formation across species.

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Last Updated: May 25, 2026

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Published on: February 6, 2018

Area of Science:

  • Reproductive Biology
  • Molecular Biology
  • Cell Biology

Background:

  • Gametogenesis involves precise gene expression for germ cell development.
  • Nucleocytoplasmic transport ensures accurate gene regulation for fertility.
  • This process requires specific molecular machinery for germ cell differentiation.

Purpose of the Study:

  • To review the role of nucleocytoplasmic transport in gametogenesis.
  • To compare conserved and specialized transport functions across species (mice, flies, worms).
  • To highlight the necessity and specificity of nuclear transport factors and nucleoporins.

Main Methods:

  • Literature review focusing on nucleocytoplasmic transport mechanisms.
  • Comparative analysis of gametogenesis and nuclear transport in model organisms.
  • Synthesis of existing knowledge on importins, Ran, and nucleoporins in germ cell development.

Main Results:

  • Nucleocytoplasmic transport molecules are vital for germ cell differentiation.
  • Specific transport factors and nucleoporins demonstrate necessity and specificity in gamete formation.
  • Evidence supports conserved and specialized roles of these factors across species.

Conclusions:

  • Nuclear transport is indispensable for successful gametogenesis and fertility.
  • Understanding these molecular mechanisms provides insights into reproductive health.
  • Comparative studies reveal fundamental principles of germ cell development.