Abstract
The codon assignment of the quasi-universal genetic code can be assumed to have resulted from the evolutionary pressures that prevailed when the code was still evolving. Here, we review studies of the structure of the genetic code based on optimization models. We also review studies that, from the structure of the code, attempt to derive aspects of the primordial circumstances in which the genetic code froze. Different rationales are summarized, compared with experimental data, discussed in the context of the transition from a RNA world to a DNA-protein world, and linked to the emergence of the last universal common ancestor.
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Acknowledgments
AK has been supported by the Discovery and Canada Research Chair Programs of the National Science and Engineering Research Council (NSERC) of Canada.
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Jestin, J.L., Kempf, A. Optimization Models and the Structure of the Genetic Code. J Mol Evol 69, 452–457 (2009). https://doi.org/10.1007/s00239-009-9287-5
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DOI: https://doi.org/10.1007/s00239-009-9287-5