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Related Concept Videos

The Nucleolus02:55

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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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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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RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
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Systematic mapping of small nucleolar RNA interactions in human cells.

Hywel Dunn-Davies1, Tatiana Dudnakova1, Jean-Louis Langhendries2

  • 1Centre for Cell Biology, School of Biological Sciences, University of Edinburgh, Edinburgh, UK.

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Small nucleolar RNAs (snoRNAs) interact with more RNAs than previously known, revealing novel roles beyond methylation in human cells. These findings expand our understanding of snoRNA functions in gene regulation and disease.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Altered expression of box C/D small nucleolar RNAs (snoRNAs) is linked to human diseases like cancer.
  • While canonically directing 2'-O-methylation, the full functional repertoire of snoRNAs remains largely unexplored.

Purpose of the Study:

  • To comprehensively identify RNA interactions of box C/D snoRNAs in human cells.
  • To explore novel functions of snoRNAs beyond their canonical role in RNA methylation.

Main Methods:

  • Utilized UV crosslinking, proximity ligation, and sequencing of RNA hybrids (CLASH and FLASH) to map snoRNA interactions.
  • Developed a bioinformatics pipeline for rigorous identification and analysis of snoRNA-RNA interactions.
  • Performed U3 snoRNA depletion experiments to assess functional consequences of snoRNA-mRNA interactions.

Main Results:

  • Identified hundreds of novel interactions between snoRNAs and rRNA, other snoRNAs, and mRNAs.
  • Discovered numerous snoRNA-rRNA interactions not predicted to direct methylation, suggesting roles in ribosome biogenesis.
  • Documented extensive snoRNA-mRNA interactions, with U3 snoRNA showing unique binding patterns and functional impact upon depletion.
  • Observed enrichment of snoRNA association with intronic regions, indicating regulation of snoRNA maturation.

Conclusions:

  • Box C/D snoRNAs engage in diverse RNA interactions, extending their known functions beyond methylation.
  • These novel interactions may play significant roles in gene regulation, RNA processing, and cellular function.
  • Findings provide a foundation for understanding snoRNA contributions to human health and disease.