Table 3.
A snapshot statistics of transition (Ts) and transversion (Tv) variations of SARS-CoV-2
| Cutoff |
Number of mutations per genome |
All | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11+ | |||
| 1 | Ts | 42 | 156 | 235 | 247 | 414 | 731 | 1098 | 1288 | 1357 | 1111 | 1704 | 8383 |
| Tv | 19 | 50 | 72 | 88 | 147 | 291 | 412 | 518 | 552 | 463 | 952 | 3564 | |
| Ts/Tv | 2.21 | 3.12 | 3.26 | 2.81 | 2.82 | 2.51 | 2.67 | 2.49 | 2.46 | 2.40 | 1.79 | 2.35 | |
| 2 | Ts | 53 | 154 | 184 | 226 | 328 | 583 | 894 | 993 | 942 | 770 | 938 | 6065 |
| Tv | 19 | 38 | 56 | 52 | 130 | 233 | 299 | 371 | 356 | 294 | 446 | 2294 | |
| Ts/Tv | 2.79 | 4.05 | 3.29 | 4.35 | 2.52 | 2.50 | 2.99 | 2.68 | 2.65 | 2.62 | 2.10 | 2.64 | |
| 3 | Ts | 50 | 128 | 156 | 207 | 288 | 510 | 743 | 806 | 733 | 559 | 677 | 4857 |
| Tv | 20 | 31 | 42 | 57 | 104 | 190 | 260 | 295 | 284 | 220 | 321 | 1824 | |
| Ts/Tv | 2.50 | 4.13 | 3.71 | 3.63 | 2.77 | 2.68 | 2.86 | 2.73 | 2.58 | 2.54 | 2.11 | 2.66 | |
Note: The median numbers of mutations per genome are 6–7, which are slightly different among clades. Data are downloaded from the National Genomics Data Center, Beijing Institute of Genomics, Chinese Academy of Sciences/China National Center for Bioinformation in May, 2020. The data are not an up-to-date collection so that it provides only a snapshot of the reality in passing. Ts, transition; Tv, transversion. We set cutoffs (cutoffs 1–3) to extract mutations identified in at least 1, 2, or 3 CoV genome sequences.