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Related Concept Videos

pre-mRNA Processing02:01

pre-mRNA Processing

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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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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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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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A Reporter Assay to Analyze Intronic microRNA Maturation in Mammalian Cells
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Mitochondrial RNA maturation.

Zofia M Chrzanowska-Lightowlers1, Robert N Lightowlers1

  • 1Wellcome Centre for Mitochondrial Research, Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK.

RNA Biology
|October 10, 2024
PubMed
Summary
This summary is machine-generated.

Mitochondrial genome (mtDNA) expression is surprisingly complex, involving diverse RNA processing, editing, and maturation events. This essential process relies heavily on nuclear-encoded proteins, challenging assumptions of simplicity.

Keywords:
Mitochondrialmaturationmessenger RNAmodificationsprocessingtranslation

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Area of Science:

  • Cellular and Molecular Biology
  • Genetics and Genomics
  • Biochemistry

Background:

  • Most oxygen-utilizing eukaryotes depend on their mitochondrial genome (mtDNA) for survival.
  • mtDNA is significantly smaller than the nuclear genome, suggesting a simpler expression system.
  • Mitochondria originated from endosymbiotic bacteria.

Purpose of the Study:

  • To review the complexity of mitochondrial RNA (mtRNA) production.
  • To highlight the diverse and intricate mechanisms involved in mtRNA expression across species.
  • To challenge the assumption that mtDNA expression is simple.

Main Methods:

  • Literature review of scientific publications on mitochondrial gene expression.
  • Comparative analysis of RNA processing, modification, editing, and splicing pathways.
  • Examination of the role of nuclear-encoded proteins in organelle gene expression.

Main Results:

  • mtRNA production exhibits extensive species-specific variations.
  • Organelles employ a wide range of complex RNA processing and maturation steps.
  • Nuclear-encoded proteins are crucial for many essential mtRNA modification events.
  • Unusual features of the mitochondrial genome influence RNA processing.

Conclusions:

  • Mitochondrial gene expression is far more complex than previously assumed.
  • The evolution of mtRNA production pathways is diverse and intricate.
  • Understanding these processes requires appreciating the interplay between mitochondrial and nuclear genomes.