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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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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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Augmented genetic decoding: global, local and temporal alterations of decoding processes and codon meaning.

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The genetic code is not universal, with variations found across organisms and even within specific genes. Recent discoveries reveal spectacular decoding plasticity, including altered translation and environmental responses.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • The genetic code, governing protein synthesis, was long considered universal.
  • Emerging evidence highlights significant variations in decoding rules across different life forms.
  • Site-specific gene alterations can modify translation processes.

Purpose of the Study:

  • To review and categorize diverse instances of alternative genetic decoding.
  • To update terminology for recently identified decoding plasticity.
  • To provide a comprehensive overview of non-universal genetic codes.

Main Methods:

  • Literature review of recent discoveries in genetic code variations.
  • Analysis of case studies involving disrupted triplet continuity and host-specific code alteration.
  • Synthesis of findings to propose expanded terminology.

Main Results:

  • Documented examples of organisms and organelles with altered translation.
  • Identification of viruses that reprogram host genetic codes.
  • Observed environmental adaptability in genetic code adjustments.
  • Disruptions in standard triplet reading frames during gene translation.

Conclusions:

  • Genetic code universality is challenged by numerous exceptions.
  • Decoding plasticity is a sophisticated and widespread phenomenon.
  • Expanded terminology is necessary to accurately describe these variations.