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Related Concept Videos

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...
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...
Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological states or needs.
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...
Brainstem: Control Centers of Medulla01:21

Brainstem: Control Centers of Medulla

The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
Olivary Nucleus
The olivary nucleus, or inferior olivary nucleus, is located within the ventrolateral part of the medulla oblongata. It is primarily involved in motor coordination and motor learning. The olivary nucleus receives input from the spinal cord, cerebellum, and motor...

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Related Experiment Video

Updated: May 29, 2026

Intranuclear Microinjection of DNA into Dissociated Adult Mammalian Neurons
13:39

Intranuclear Microinjection of DNA into Dissociated Adult Mammalian Neurons

Published on: December 10, 2009

Redirecting traffic in the nucleus.

Kulwant Singh1, F Jeffrey Dilworth

  • 1Sprott Center for Stem Cell Research, Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada.

Developmental Cell
|September 17, 2011
PubMed
Summary
This summary is machine-generated.

The Msx1 homeoprotein relocates Ezh2 and H3K27me3 to the nuclear periphery. This spatial gene organization represses transcription in muscle progenitor cells during development.

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Heterokaryon Technique for Analysis of Cell Type-specific Localization
09:31

Heterokaryon Technique for Analysis of Cell Type-specific Localization

Published on: March 11, 2011

Related Experiment Videos

Last Updated: May 29, 2026

Intranuclear Microinjection of DNA into Dissociated Adult Mammalian Neurons
13:39

Intranuclear Microinjection of DNA into Dissociated Adult Mammalian Neurons

Published on: December 10, 2009

Heterokaryon Technique for Analysis of Cell Type-specific Localization
09:31

Heterokaryon Technique for Analysis of Cell Type-specific Localization

Published on: March 11, 2011

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Developmental Biology

Background:

  • Gene transcription is influenced by the three-dimensional organization of the genome within the nucleus.
  • Understanding how nuclear architecture affects gene regulation is crucial for developmental processes.

Purpose of the Study:

  • To investigate the role of the Msx1 homeoprotein in nuclear spatial organization.
  • To determine the impact of Msx1 on the localization of epigenetic modifiers and transcriptional repression.

Main Methods:

  • Analysis of muscle progenitor cells.
  • Immunofluorescence to visualize protein and histone modification localization.
  • Assessing transcriptional activity of developmentally regulated genes.

Main Results:

  • Msx1 homeoprotein induces a significant redistribution of Ezh2 and H3K27me3.
  • These epigenetic marks are relocated to the nuclear periphery.
  • This redistribution leads to the repression of specific developmentally regulated genes.

Conclusions:

  • Nuclear spatial organization, driven by Msx1, is a key mechanism for transcriptional repression.
  • The Msx1-mediated relocation of Ezh2 and H3K27me3 to the nuclear periphery controls gene expression during muscle development.