Codon usage correlations and crystal basis model of the genetic code

International audienceThe ratios of the codon frequencies for amino acids coded by four codons (quartets), as well as those coded by six codons (sextets) in the genetic code for 29 biological species for which the whole codon number, determined from the available coding sequences, is larger than about 100 000, exhibit a correlated behaviour. This correlation fits naturally in the framework of the crystal basis model of the genetic cod