Table 1.
Numbers of Loci Exhibiting Simple Sequence Repeats of Given Structure in the Genome of E. coli Strain K12
| No. of repeats per locus | Motif length in nucleotides | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| mono- | di- | tri- | tetra- | penta- | hexa- | ||||||
| 3 | 163,345 | (163,134) | 7,081 | (9,538) | 2,353* | (778) | 51 | (52) | — | 3 | (0) |
| 4 | 42,901* | (40,795) | 465 | (590) | 64* | (12) | 1 | (0) | — | — | |
| 5 | 13,837* | (10,262) | 28 | (39) | 2 | (0) | — | — | — | ||
| 6 | 4,123* | (2,570) | 1 | (2) | — | — | — | — | |||
| 7 | 1,000* | (625) | — | — | — | — | — | ||||
| 8 | 217* | (158) | — | — | — | — | — | ||||
| 9 | 22 | (39) | — | — | — | — | — | ||||
| 10 | 1 | (11) | — | — | — | — | — | ||||
Genome-wide frequencies of SSR arrays of given motif length and repeat number were compared to mean frequencies in computer-generated randomized genomes (shown in parentheses). (*) Significant deviations from normal distribution-based expectations at the 0.001 level are indicated by asterisks.