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Evolution of the amino acid code: inferences from mitochondrial codes.

T H Jukes

    Journal of Molecular Evolution
    |January 1, 1983
    PubMed
    Summary

    The genetic code evolved from a simpler archetypal form, not a complex one. Mammalian mitochondrial codes show simplification, suggesting a retrogression towards this ancestral state.

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    Area of Science:

    • Molecular Biology
    • Evolutionary Biology
    • Genetics

    Background:

    • The genetic code translates mRNA codons into amino acids via transfer RNA (tRNA) anticodon pairing.
    • The universal code uses 54 anticodons for 20 amino acids, while mammalian mitochondrial codes use fewer (22 anticodons).

    Purpose of the Study:

    • To propose an evolutionary model for the genetic code's origin.
    • To explain the reduced anticodon number in mammalian mitochondrial codes.

    Main Methods:

    • Comparative analysis of genetic codes.
    • Hypothesizing evolutionary pathways involving gene duplication and mutation.

    Main Results:

    • An archetypal genetic code with 16 anticodons for 15 amino acids is proposed.
    • Gene duplication and subsequent mutations likely led to the universal code.
    • Mammalian mitochondrial codes exhibit simplification, with single anticodons for multiple amino acids.

    Conclusions:

    • The evolution of the genetic code may have involved simplification and subsequent expansion.
    • Mammalian mitochondrial codes might represent a retrogression towards an ancestral, simpler code.

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