Table 2. Nucleotide differences between C. abortus and C. psittaci rRNA molecules compared with related taxaa.
| Position inb | C. abortus | C. psittaci | C. caviae | C. felis | C. pecorum | C. pneumoniae | C. trachomatis | C. muridarum | C. suis | Parachlamydiaceae | Waddliaceae | Simkaniaceae | Domain Bacteria c |
| 16S rRNA | |||||||||||||
| 224 | A | G/A* | A | G | A | G | A | A | A | A | A | G/A | A 33.01; G 14.17; U 41.17; C 11.57 |
| 277 | U/C† | C | C | C | C | C | C | C | C | C | C | C | U 0.59; C 99.27; A 0.00; G 0.10 |
| 396 | A/G† | G | G | G | G | G | G | G | G | G | G | G | A 37.42; G 30.29; C 31.05; U 1.20 |
| 1267 | C | U/C* | C | U | U | U | C/U | C | U | U/C | C | A | C 66.45; U 30.80; A 0.73; G 0.26 |
| 1268 | A | G/A* | A | G | G | G | G | G | G | G | G | A | A 12.57; G 85.42; C 0.17; U 0.09 |
| 16S–23S Intergenic Spacer | |||||||||||||
| 49 | A | G/A* | G | A | A | A | G/A | A | G/A | U | G | – | |
| 55–56 | – | U/–* | A | A | – | – | U | U | C | G | – | U | |
| 185 | C | A/C* | C | A | C | C | U | U | U | U | A | G | |
| 192–193 | – | A/–* | – | A | – | A | A | A | A | A | A | C | |
| 198 | A | U/A* | A | A | A | A | A | A | A | G | A | G | |
| 204 | U | C | C | C | C | C | C | C | C | U | – | C | |
| 23S rRNA (domain I) | |||||||||||||
| 18 | U | C | C | C | C | C | C | C | C | C | C | C | U 18.73; C 80.88; A 0.40; G 0.00 |
| 132 | A | G/A* | G | G | A | A | G | G | G | A | A | G/A | A 17.23; G 46.82; C 33.71; U 0.75 |
| 147 | U | C/U* | C | C | U | U | C | C | C | U | U | C/U | U 37.78; C 25.19; G 34.44; A 1.11 |
| 152 | G/A† | A | A | A | A | A | G | G | G | U/C | U | C/U | G 19.63; A 27.78; U 13.70; C 37.78 |
| 157 | C | U/C* | C | C | C | U/C | C | C | C | C | C/U | C | C 62.22; U 11.11; G 15.93; A 2.96 |
| 181–182 | U/C† | C | C | C | A | C | C | C | C | U/C | G | U/– | |
| 240 | G | A/G* | A | G | G | G | G | G | G | A/U | G | U | G 39.71; A 22.38; U 21.30; C 16.61 |
| 297 | C | U/C* | U | U | U | U | U | U | U | C/A | C | A | C 23.38; U 29.86; A 25.90; G 20.50 |
| 547 | C/U ‡ | A/C* | C | C | C | C | A | A | A | U/A | A | U | C 16.13; U 20.79; A 53.76; G 9.32 |
More than three accession numbers for each species or family, including the type strain, were analyzed (the majority of analyzed strains and their accession numbers are given in the Figures S2, S3, and S4).
Nucleotide positions of the 16S and 23S domain I rRNA are given according to the E. coli J01695 secondary structure numbering system [35]; 16S–23S Intergenic Spacer positions based on primary structure is given according to the C. abortus type strain B577T sequence (U68445). Signature and unique residues for C. abortus strains and the corresponding positions are shown in bold; see text for details. Dashes indicate nucleotide gaps in rRNA sequence comparison.
Single base frequencies within domain Bacteria (dataset from http://www.rna.ccbb.utexas.edu/SAE/2A/nt_Frequency/).
Nucleotide in C. abortus LLG/POS variant;
Nucleotide in C. abortus FAG/VPG variant;