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Related Concept Videos

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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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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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Translation01:31

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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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The relationship between speculation and translation in Bioethics: methods and methodologies.

Tess Johnson1, Elizabeth Chloe Romanis2,3

  • 1Ethox Centre, Nuffield Department of Population Health, University of Oxford, Oxford, UK.

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|September 28, 2023
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Summary
This summary is machine-generated.

Speculative bioethics, an important area of inquiry, can support translational bioethics when used as a tool for novel ethical analysis or preliminary research. Its compatibility depends on its application, not uniform impact standards.

Keywords:
EctogestationEnhancementImpactSpeculative bioethicsTranslational bioethics

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Area of Science:

  • Bioethics
  • Philosophy of Science

Background:

  • Bioethics faces increasing pressure to emphasize 'translational' research.
  • This context necessitates a defense of 'speculative bioethics' as a valuable approach.

Purpose of the Study:

  • To defend speculative bioethics as a crucial tool and line of inquiry.
  • To examine the relationship between speculative and translational bioethics.
  • To posit that speculation can effectively support translational work.

Main Methods:

  • Exploration of speculation as a bioethical tool.
  • Analysis of the relationship between speculative and translational bioethics.
  • Examination of methodological aspects for good speculative bioethics research.

Main Results:

  • Speculative research can serve as ethical analysis of contemporary issues through a new lens, supporting translational work.
  • Speculation can act as a preliminary step before undertaking translational work on a topic.
  • Speculative bioethics may also represent distinct content with no translational objectives.

Conclusions:

  • The compatibility of speculative and translational bioethics hinges on whether speculation is employed as a tool or as content.
  • Uniform application of impact standards may inappropriately limit the scope of speculative bioethics.
  • Speculative bioethics offers unique contributions that should not be overlooked.