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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...
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 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...
Additional Subnuclear Structures02:10

Additional Subnuclear Structures

The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
The nucleus contains many membrane-less subnuclear organelles or nuclear bodies, such as nucleoli, Cajal bodies, speckles, paraspeckles, etc. These nuclear...
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 Localization Signals and Import01:46

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...

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Related Experiment Video

Updated: May 23, 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

Primary biliary cirrhosis and the nuclear pore complex.

Carolina Duarte-Rey1, Dimitrios Bogdanos, Chen-Yen Yang

  • 1Division of Rheumatology, Allergy and Clinical Immunology, University of California at Davis School of Medicine, Davis, CA 95616, USA.

Autoimmunity Reviews
|April 11, 2012
PubMed
Summary

Autoimmune responses targeting nuclear pore complex (NPC) proteins, like gp210 and p62, are specific markers for primary biliary cirrhosis (PBC). These autoantibodies offer insights into PBC pathogenesis and potential molecular mimicry.

Related Experiment Videos

Last Updated: May 23, 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

Area of Science:

  • Immunology
  • Hepatology
  • Molecular Biology

Background:

  • Autoimmune diseases involve immune responses to nuclear antigens, indicating loss of tolerance and potential tissue damage.
  • Antinuclear antibodies (ANAs) target various nuclear proteins across systemic and organ-specific autoimmune conditions.
  • Nuclear pore complex (NPC) proteins are implicated in molecular transport and are targets in certain autoimmune diseases.

Purpose of the Study:

  • To review the diagnostic and clinical significance of anti-NPC antibodies in primary biliary cirrhosis (PBC).
  • To explore the potential role of molecular mimicry in the development of anti-NPC autoantibodies in PBC.

Main Methods:

  • Review of existing literature on antinuclear antibodies and primary biliary cirrhosis.
  • Analysis of studies investigating antibodies targeting nuclear pore complex proteins (gp210, p62) in PBC patients.

Main Results:

  • Approximately 25% of PBC patients exhibit antibodies targeting NPC proteins.
  • Antibodies against gp210 and p62 are highly specific markers for PBC.
  • Anti-NPC antibodies are associated with the autoimmune destruction of intrahepatic biliary epithelial cells.

Conclusions:

  • Anti-NPC antibodies, particularly against gp210 and p62, are valuable diagnostic and clinical markers for PBC.
  • The autoimmune response in PBC may involve molecular mimicry, leading to the production of anti-NPC antibodies.
  • Further research into anti-NPC antibodies can elucidate PBC pathogenesis and potential therapeutic strategies.