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Related Concept Videos

Ribosome Profiling02:24

Ribosome Profiling

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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.
Applications of ribosome profiling
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RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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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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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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De novo Identification of Actively Translated Open Reading Frames with Ribosome Profiling Data
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Identifying (non-)coding RNAs and small peptides: challenges and opportunities.

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|October 28, 2014
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Summary

High-throughput studies reveal many novel transcripts, challenging traditional RNA classification. Ribosome profiling shows pervasive translation, uncovering functional short proteins and highlighting the importance of RNA annotation in zebrafish.

Keywords:
Apela/ELABELA/Toddlercoding potentialgene annotationncRNAspeptidesshort ORFszebrafish

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Area of Science:

  • Genomics and Transcriptomics
  • Molecular Biology
  • Bioinformatics

Background:

  • High-throughput studies have identified numerous novel RNA transcripts.
  • The coding potential and functional roles of these transcripts remain largely uncharacterized and debated.
  • Previous annotation efforts may have underestimated the extent of RNA translation.

Purpose of the Study:

  • To review RNA annotation studies in zebrafish.
  • To discuss the challenges in classifying RNAs along a functional continuum.
  • To highlight the significance of accurate annotation for discovering novel functions.

Main Methods:

  • Review of existing zebrafish annotation studies.
  • Integration of computational approaches with ribosome profiling data.
  • Analysis of RNA transcripts for coding potential and functional peptide production.

Main Results:

  • Ribosome profiling indicates widespread translation of previously non-coding transcripts.
  • Discovery of novel, short functional proteins encoded by these transcripts.
  • Identification of transcripts where the translation process itself may confer function.

Conclusions:

  • Accurate RNA annotation is crucial for understanding transcript function.
  • The zebrafish model provides valuable insights into the RNA functional spectrum.
  • Discovery of novel peptides, like Apela/ELABELA/Toddler, underscores the potential of uncharacterized transcripts.