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Related Concept Videos

pre-mRNA Processing02:01

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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'Mediator-ing' messenger RNA processing.

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Summary
This summary is machine-generated.

Transcription and pre-messenger RNA (mRNA) processing are coupled for gene expression. This review highlights how transcription factors, like the Mediator complex, influence RNA Polymerase II elongation, mRNA splicing, and polyadenylation.

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Area of Science:

  • Molecular Biology
  • Gene Expression Regulation
  • Biochemistry

Background:

  • Pre-messenger RNA (mRNA) processing, encompassing capping, splicing, and polyadenylation, is intrinsically linked to transcription.
  • This coupling is crucial for efficient and regulated gene expression and editing.
  • Numerous transcription factors/cofactors and mRNA processing factors orchestrate this intricate process.

Purpose of the Study:

  • To review classic examples and recent advancements in understanding transcription-mRNA processing coupling.
  • To elucidate the role of transcriptional factors and cofactors, particularly the Mediator complex.
  • To detail their contributions to RNA Polymerase II (Pol II) elongation, mRNA splicing, and polyadenylation.

Main Methods:

  • Literature review of established and emerging research.
  • Analysis of molecular mechanisms linking transcription and mRNA processing.
  • Focus on the Mediator complex's function in key gene expression steps.

Main Results:

  • Established physical and functional associations between transcription and mRNA processing.
  • Demonstrated importance of transcription factors/cofactors in coordinating these processes.
  • Highlighted the Mediator complex's multifaceted role in RNA Pol II elongation, splicing, and polyadenylation.

Conclusions:

  • The coordinated action of transcription and mRNA processing is essential for accurate gene expression.
  • Transcriptional factors, especially the Mediator complex, are key regulators of this coupling.
  • Further research continues to refine our understanding of these fundamental molecular events.