TABLE 4.
Comparison of unusually long SSRs in S. agalactiae and Gram-negative bacteria
| Species | Genome size (Mb) | % G+C | Type of repeat unit(s)a |
Phase variationb | Source or reference | ||||
|---|---|---|---|---|---|---|---|---|---|
| Poly-A/T | Poly-G/C | Di | Tetra | Penta | |||||
| S. agalactiae | 2.16 | 35.6 | 1×(15) | 0 | 1×(8) | 0 | 0 | A > G > Di | 22; this study |
| C. jejuni | 1.64 | 30.6 | 0 | 26×(9-12), 9 | 0 | 0 | 0 | G/C | 20, 44 |
| H. pylori | 1.67 | 39 | 19×(11-16), 14 | 23×(9-15), 12 | 7×(8-11), 9 | 0 | 0 | G/C > Di >A | 1, 27, 30, 40 |
| H. influenzae | 1.83 | 38 | 0 | 0 | 0 | 12×(6-37), 22 | 2×(4-12) | Tetra | 11 |
| N. meningitidis | 2.27 | 51.5 | 10×(10-14), 10.5 | 13×(10-14), 11 | 0 | 5×(5-20), 9 | 5×(10-16), 13 | G/C > Tetra > A | 18 |
a
For each type of repeat unit, “n×” represents the number of occurrences of SSRs with the range of lengths in parentheses, followed by the median length in base pairs.
b
Previously reported phase variation and the types of repeats involved in numerical order of importance.