Table 2.
Comparison of favourite codons and tRNA copy numbers
| Species | Number of tRNAs | Number of favourite codons having the highest tRNA copy number (out of 18 cases) | (%) | Number of favorite codons lacking tRNA | Number of codons lacking tRNA |
|---|---|---|---|---|---|
| H. sapiens | 589 | 9 | 50.0 | 2 | 6 |
| C. elegans | 563 | 12 | 66.7 | 6 | 15 |
| M. musculus | 441 | 12 | 66.7 | 2 | 8 |
| R. norvegicus | 385 | 10 | 55.6 | 5 | 13 |
| D. melanogaster | 268 | 12 | 66.7 | 6 | 18 |
| S. cerevisiae | 259 | 15 | 83.3 | 3 | 20 |
| S. pombe | 158 | 15 | 83.3 | 2 | 16 |
| C. albicans | 119 | 15 | 83.3 | 3 | 20 |
| H. capsulatum | 71 | 8 | 44.4 | 5 | 16 |
| P. falciparum | 33 | 14 | 77.8 | 7 | 26 |
(The codons for Stop, Met and Trp are excluded). tRNA: transfer RNA. Copy numbers of tRNA genes come from GtRNAdb 2.019. The percentage of favourite codons (one per amino acid) that have the highest tRNA copy number lies above 50% for all species but H. capsulatum.