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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. 
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The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
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The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
Golgi Apparatus01:49

Golgi Apparatus

As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.The Golgi apparatus is a major sorting and dispatch station for the products of the ER. Newly arriving vesicles enter...
Golgi Apparatus01:09

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Properly folded and assembled proteins are selectively packaged into vesicles that exit the ER. Motor proteins transport these vesicles to the Golgi apparatus for adding modifications that make these proteins functional at their destination.
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
Neurons: The Cell Body and the Dendrites01:23

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A typical nerve cell comprises three main components: the cell body, dendrites, and the axon. The cell body, also known as the soma or perikaryon, serves as the central biosynthetic hub housing a nucleus surrounded by cytoplasm containing organelles commonly found in most cells. Notably, Nissl bodies, clusters of the rough endoplasmic reticulum and free ribosomes responsible for protein synthesis, are distinctive features of the neuronal cell body. As neurons age, aggregates of a brown pigment...

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The Cajal body.

Glenn E Morris1

  • 1Wolfson Centre for Inherited Neuromuscular Disease, RJAH Orthopaedic Hospital, OSWESTRY, SY10 7AG, UK. glenn.morris@rjah.nhs.uk

Biochimica Et Biophysica Acta
|August 30, 2008
PubMed
Summary
This summary is machine-generated.

Cajal bodies concentrate proteins like coilin to enhance nuclear processes, including the assembly of RNA splicing machinery. The SMN protein, linked to spinal muscular atrophy, is crucial for this process.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Neuroscience

Background:

  • Cajal bodies are nuclear structures containing the protein coilin.
  • They are involved in enhancing nuclear processes by concentrating components.
  • Key processes include the modification and assembly of U small nuclear ribonucleoproteins (U snRNPs).

Purpose of the Study:

  • To explore the role of Cajal bodies in nuclear processes.
  • To investigate the function of coilin and its interactions within Cajal bodies.
  • To understand the significance of SMN protein in Cajal body function and U snRNP assembly.

Main Methods:

  • Identification of Cajal bodies and their protein components.
  • Analysis of protein interactions within Cajal bodies.
  • Investigating the role of SMN in U snRNP biogenesis.

Main Results:

  • Cajal bodies concentrate proteins, including coilin, to improve nuclear process efficiency.
  • SMN protein is a Cajal body component essential for spliceosomal U snRNP assembly.
  • SMN facilitates cytoplasmic assembly and nuclear delivery of U snRNPs.

Conclusions:

  • Cajal bodies play a vital role in nuclear RNA processing and assembly.
  • The SMN protein's presence in Cajal bodies highlights its importance in U snRNP biogenesis.
  • Dysfunction of SMN in Cajal bodies may contribute to spinal muscular atrophy pathogenesis.