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Related Concept Videos

The Nucleus01:25

The Nucleus

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
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Additional Subnuclear Structures02:10

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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. 
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Diversity of Protists I01:15

Diversity of Protists I

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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Nuclear Protein Sorting01:34

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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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Nucleoid01:24

Nucleoid

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The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
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The Nucleolus02:55

The Nucleolus

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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Updated: Jul 17, 2025

Purification of Extracellular Trypanosomes, Including African, from Blood by Anion-Exchangers Diethylaminoethyl-cellulose Columns
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Deviating from the norm: Nuclear organisation in trypanosomes.

Mark C Field1

  • 1School of Life Sciences, University of Dundee, Dundee, UK; Institute of Parasitology, Biology Centre, Czech Academy of Sciences, České Budějovice, Czechia.

Current Opinion in Cell Biology
|September 4, 2023
PubMed
Summary
This summary is machine-generated.

The eukaryotic nucleus appears conserved, but new research reveals significant functional and compositional divergence in nuclear structures, particularly in trypanosomes. This highlights the adaptability of nuclear architecture across diverse life forms.

Keywords:
EukaryogenesisLaminaLaminsMolecular evolutionNuclear architectureNuclear envelopeNuclear pore complexTrypanosomes

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Molecular Biology

Background:

  • The eukaryotic nucleus is generally considered a highly conserved organelle with consistent ultrastructural features.
  • Observed consistencies include nuclear morphology, the nuclear pore complex, heterochromatin, and the nuclear envelope.

Purpose of the Study:

  • To highlight recent findings on compositional and functional divergence within nuclear structures.
  • To explore the evolutionary framework of nuclear architecture.
  • To advocate for studying nuclear function in non-canonical experimental organisms.

Main Methods:

  • Review of recent research findings on nuclear structures in trypanosomes.
  • Analysis of evolutionary patterns in eukaryotic nuclear organization.
  • Comparative analysis of nuclear architecture across different lineages.

Main Results:

  • Significant compositional divergence exists within conserved nuclear structures like the nuclear pore complex and heterochromatin.
  • Functional interpretations for many mechanistic divergences are currently lacking.
  • Nuclear architecture demonstrates considerable malleability, adapting to diverse eukaryotic lineages.

Conclusions:

  • Despite apparent conservation, nuclear structures exhibit substantial divergence in composition and function.
  • Trypanosomes provide a key model for understanding nuclear plasticity and adaptation.
  • Further research in diverse organisms is crucial for a comprehensive understanding of nuclear function.