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The genetic code and cyclic codes

J Demongeot1, J Besson

  • 1TIMC-IMAG, faculté de médecine de Grenoble, La Tronche, France.

Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
|June 1, 1996
PubMed
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The proposed cyclic AB code, a primitive genetic structure, exhibits essential coding properties and contains frequent triplets, offering a new model for early genetic systems.

Area of Science:

  • Molecular Biology
  • Genetics
  • Bioinformatics

Background:

  • The classical genetic code is degenerate, with 64 triplets encoding 20 amino acids.
  • Mitochondrial transfer RNAs (tRNAs) possess unique structural features, such as specific loop regions.
  • The wobble hypothesis explains base-pairing variations in the third position of codons.

Purpose of the Study:

  • To introduce and characterize a novel cyclic genetic code, termed the AB code.
  • To explore the AB code's potential as a primitive genetic structure.
  • To compare the AB code's properties with existing genetic code and tRNA structures.

Main Methods:

  • Construction of a 22-triplet cyclic code (AB code) using classical genetic symbols (A, U, C, G).
  • Analysis of the AB code's cyclic properties, including initiation and termination codons.

Related Experiment Videos

  • Comparison of the AB code's base composition and triplet frequency with known genomes and mitochondrial tRNAs.

    • Main Results:

    • The AB code starts with AUG and ends with UGA, encoding one amino acid per synonymy class.
    • It features triplets beginning with 15 of 16 possible base doublets, aligning with the wobble hypothesis.
    • The AB code shares similarities with mitochondrial Gly-tRNA and other primitive tRNAs, exhibiting an AU-rich composition.

    Conclusions:

    • The cyclic AB code represents a primitive genetic structure with key coding properties.
    • Its AU-rich composition and structural coherence offer insights beyond classical probabilistic models.
    • The AB code provides a potential framework for understanding early genetic code evolution.