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Related Concept Videos

Regulation of Nuclear Protein Sorting01:45

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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...
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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 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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Chromatin Position Affects Gene Expression02:35

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
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The multifunctional nuclear pore complex: a platform for controlling gene expression.

Christopher Ptak1, John D Aitchison2, Richard W Wozniak1

  • 1Department of Cell Biology, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.

Current Opinion in Cell Biology
|March 25, 2014
PubMed
Summary
This summary is machine-generated.

Nuclear pore complexes (NPCs) interact with chromatin, influencing gene expression and cellular processes. Specific NPC proteins play key roles in regulating transcription, mRNA processing, and chromatin organization.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Nuclear pore complexes (NPCs) are traditionally known for nucleocytoplasmic transport.
  • Morphological observations suggest NPCs influence peripheral chromatin structure and gene expression.
  • Recent findings reveal physical interactions between NPCs, chromatin, and transcriptional machinery.

Purpose of the Study:

  • To review recent studies on the role of NPC components in chromatin-dependent processes.
  • To provide molecular details on how NPCs regulate gene expression.
  • To highlight NPC proteins as platforms for chromatin-related functions.

Main Methods:

  • Literature review of recent molecular and cellular biology studies.
  • Analysis of research identifying physical interactions between NPCs, chromatin, and transcription factors.
  • Synthesis of findings on the functions of specific NPC proteins.

Main Results:

  • Specific NPC proteins are involved in transcriptional activation and elongation.
  • NPC components contribute to mRNA processing.
  • NPCs play a role in chromatin structure and localization.

Conclusions:

  • NPCs are integral to regulating gene expression beyond nucleocytoplasmic transport.
  • Specific NPC proteins act as platforms for key chromatin-dependent processes.
  • Further research elucidates the multifaceted roles of NPCs in nuclear organization and function.