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Related Concept Videos

Translation01:31

Translation

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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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Improving Translational Accuracy02:07

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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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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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RNA Stability01:53

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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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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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Translational fidelity and longevity are genetically linked.

Boyang Zheng1,2, Weijie Zhang1,2, Gongwang Yu3

  • 1Advanced Medical Technology Center, The First Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.

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|August 13, 2025
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Summary

This study shows that reduced translation errors correlate with longer lifespans in yeast. Modifying the VPS70 gene decreased errors and extended life, supporting the role of translational fidelity in aging.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Gerontology

Background:

  • Aging is characterized by detrimental changes that increase mortality risk.
  • The Error-Catastrophe Theory posits that accumulating translation errors drive aging.
  • Empirical evidence, particularly intra-specific fidelity-longevity correlations, remains limited.

Purpose of the Study:

  • To investigate the correlation between translational fidelity and lifespan within a species.
  • To identify genetic factors influencing both translational fidelity and longevity.
  • To validate the impact of translational fidelity on aging processes.

Main Methods:

  • Analysis of lifespan and translational fidelity in yeast recombinant haploid progenies.
  • Quantitative Trait Locus (QTL) analysis to identify associated genetic loci.
  • Gene replacement experiments to assess the functional impact of specific genes.

Main Results:

  • A significant correlation between translational fidelity and longevity was detected in long-lived yeast samples.
  • The VPS70 gene locus was strongly associated with both translational fidelity and longevity.
  • Replacing the VPS70 gene with an alternative allele reduced translation errors by 8.0% and extended lifespan by 8.9%.

Conclusions:

  • Translational fidelity significantly impacts intra-specific longevity variation.
  • The VPS70 gene plays a crucial role in regulating both translational accuracy and lifespan.
  • Findings support the relevance of translation accuracy in the biological mechanisms of aging.