Bijective codon transformations show genetic code symmetries centered on cytosine’s coding properties
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Homology of some RNAs with template DNA requires systematic exchanges between nucleotides. Such exchanges produce ‘swinger’ RNA along 23 bijective transformations (nine symmetric, X ↔ Y; and 14 asymmetric, X → Y → Z → X, for example A ↔ C and A → C → G → A, respectively). Here, analyses compare amino acids coded by swinger-transformed codons to those coded by untransformed codons, defining coding invariance after transformations. Swinger transformations cluster according to coding invariance in four groups characterized by transformations into cytosine (C = C, T → C, A → C, and G → C). C’s central mutational coding role shows that swinger transformations constrained genetic code genesis. Coding invariance post-transformations correlate positively/negatively with mitochondrial swinger transcription/lepidosaurian body temperature. Presumably, low/high temperatures stabilize/revert rare swinger polymerization modes, producing long swinger sequences/point mutations, respectively. Coding invariance after swinger transformations might compensate effects of swinger polymerizations in species with low body temperatures. Hypothetically, swinger transcription increased coding potential of RNA self-replicating protolife systems under heating/cooling cycles.
KeywordsRumer’s transformation Circular codes Abyssal hydrothermal vent
This work has been carried out thanks to the support of the A*MIDEX Project (No. ANR-11-IDEX-0001-02. funded by the « Investissements d’Avenir » French Government program, managed by the French National Research Agency (ANR) and by the Méditerranée Infection and the National Research Agency under the program “Investissements d’avenir” reference ANR-10-IAHU-03.
Compliance with ethical standards
Conflicts of interest
The author declares no conflict of interest.
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