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Related Concept Videos

Ribosome Profiling02:24

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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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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Ribosomes01:27

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Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
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Translation01:31

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Correction: Islam, R.A.; Rallis, C. Ribosomal Biogenesis and Heterogeneity in Development, Disease, and Aging. <i>Epigenomes</i> 2023, <i>7</i>, 17.

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Updated: Jul 18, 2025

Polysome Fractionation and Analysis of Mammalian Translatomes on a Genome-wide Scale
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Ribosomal Biogenesis and Heterogeneity in Development, Disease, and Aging.

Rowshan Ara Islam1,2, Charalampos Rallis1,2

  • 1School of Life Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK.

Epigenomes
|August 22, 2023
PubMed
Summary
This summary is machine-generated.

Ribosome heterogeneity, arising from variations in protein and RNA components, offers a new layer of gene expression regulation. Further research is needed to understand its role in growth, aging, and disease.

Keywords:
agingdiseasegrowthprotein translationribosome biogenesisribosomesstress

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Ribosome heterogeneity is underappreciated due to limited techniques.
  • Heterogeneity arises from variations in protein/RNA constituents and modifications.
  • Existing examples suggest a role in gene expression regulation.

Purpose of the Study:

  • To introduce ribosome biogenesis.
  • To discuss reported instances of ribosomal heterogeneity.
  • To highlight the need for further investigation into ribosome heterogeneity's biological roles.

Main Methods:

  • Literature review of ribosome biogenesis.
  • Discussion of reported cases of ribosomal heterogeneity.
  • Analysis of ribosome mutations in disease.

Main Results:

  • Ribosomal heterogeneity provides a potential mechanism for gene expression regulation.
  • It may be involved in tuning cellular responses to stimuli.
  • Ribosome mutations are linked to various diseases.

Conclusions:

  • Systematic studies across multiple organisms are required to fully understand ribosome heterogeneity.
  • This phenomenon likely impacts growth, aging, and disease processes.
  • Ribosome mutations play a significant role in human diseases.