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Related Concept Videos

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...
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 Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...

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Related Experiment Video

Updated: Jun 8, 2026

Anti-Nuclear Antibody Screening Using HEp-2 Cells
13:01

Anti-Nuclear Antibody Screening Using HEp-2 Cells

Published on: June 23, 2014

Nuclear speckles.

David L Spector1, Angus I Lamond

  • 1Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, New York 11724, USA. spector@cshl.edu

Cold Spring Harbor Perspectives in Biology
|October 8, 2010
PubMed
Summary
This summary is machine-generated.

Nuclear speckles, or interchromatin granule clusters, are dynamic nuclear structures rich in splicing factors. Their composition and dynamics offer insights into nuclear organization and gene expression.

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Capturing Cytoskeleton-Based Agitation of the Mouse Oocyte Nucleus Across Spatial Scales
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Capturing Cytoskeleton-Based Agitation of the Mouse Oocyte Nucleus Across Spatial Scales
05:43

Capturing Cytoskeleton-Based Agitation of the Mouse Oocyte Nucleus Across Spatial Scales

Published on: January 12, 2024

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Nuclear speckles (interchromatin granule clusters) are prominent nuclear domains within mammalian cells.
  • These domains are characterized by their enrichment in pre-mRNA splicing factors.
  • They are observed as dynamic, irregularly shaped structures varying in size (20-50) within the nucleoplasm.

Purpose of the Study:

  • To elucidate the composition, structure, and dynamics of nuclear speckles.
  • To understand the functional organization of the nucleus.
  • To investigate the dynamics of the gene expression machinery in relation to nuclear speckles.

Main Methods:

  • Immunofluorescence microscopy was utilized to visualize nuclear speckles.
  • Studies involved analyzing the composition and structure of these nuclear domains.
  • Dynamic properties were assessed through observation of constituent exchange.

Main Results:

  • Nuclear speckles are dynamic entities, with continuous exchange of components between speckles and the nucleoplasm.
  • Constituents can also exchange with other nuclear locations, including active transcription sites.
  • Observed as 20-50 irregularly shaped structures of varying sizes.

Conclusions:

  • Nuclear speckles serve as a crucial model for understanding nuclear functional organization.
  • The dynamic nature of speckles is integral to the regulation of gene expression.
  • Research on speckles provides insights into the interplay between nuclear structure and molecular processes.