Table 1.
Base composition of the 5′-positions of all Arabidopsis thaliana (Ath) miRNAs as contained in miRBase and for sequence-unique miRNA found to be specifically associated with AGO proteins 1, 2, 4, and 5, respectively.
| A | C | G | U | Total unique miRNAs | |
|---|---|---|---|---|---|
| Ath miRNA | 66 | 27 | 21 | 214 | 328 |
| AGO | |||||
| 1 | 0 (0.0) | 6 (1.04) | 1 (0.2) | 63 (1.4) | 70 |
| 2 | 21 (4.2) | 0 (0.0) | 1 (0.6) | 3 (0.2) | 25 |
| 4 | 5 (2.7) | 0 (0.0) | 0 (0.0) | 4 (0.7) | 9 |
| 5 | 0 (0.0) | 6 (3.3) | 0 (0.0) | 16 (1.1) | 22 |
Listed are the absolute counts as well as the corresponding odds ratios. Odd ratios were obtained by dividing the relative frequency of a particular 5′-base for a given AGO class by the corresponding relative 5′-base frequency in all Ath miRNAs. Odds ratios less than 0.5 (i.e., less than half than expected based on the general counts) are highlighted blue, while odds ratios greater than 2 indicating enrichment of a particular base relative to the background distribution are colored red. Note that the counts refer to unique sequences and not read counts as provided by Mi et al. (2008) to eliminate the influence of expression level.