ORIGINAL ARTICLE

Artificial Life and Robotics

, Volume 9, Issue 2, pp 96-98

Self-organizing mechanism of biosystems: asymmetric density ratio of purine and pyrimidine in RNA

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Abstract

The sequence data in the world-wide databases on codons and ribosome RNA (rRNA) shows that the average density ratio of purine and pyrimidine for many of species is around 1.3, while the average density ratio in transfer RNA (tRNA) is around 1.1. The reason for this difference between tRNA, codons, and rRNA is clarified in the present report. Finally, we show that these asymmetries in density promote repeat arrays and inverse repeats inside RNA and DNA.

Key words

Density ratio of bases tRNA rRNA Asymmetry Repeat RNAi