Table 2

Combinations of the three RNase H genes found in the archaeal and bacterial genomes.

Kingdom
Subdivision
No. of species
Classification of RNase H combination







Group A
Group B
Group C
Group D
Group E
Group F
Group G

Archaea
Crenarchaeota
5
0
3
0
0
0
2
0

Euryarchaeota
21
0
6
1
0
0
14
0

Nanoarchaeota
1
0
0
0
0
0
1
0

Total
27
0
9
1
0
0
17
0










Bacteria
Acidobacteria
1
0
1
0
0
0
0
0

Actinobacteria
20
0
18
1
0
1
0
0

Aquificae
1
0
0
1
0
0
0
0

Bacteroidetes
4
0
4
0
0
0
0
0

Chlamydiae
7
0
0
7
0
0
0
0

Chlorobi
3
0
3
0
0
0
0
0

Chloroflexi
2
0
2
0
0
0
0
0

Cyanobacteria
8
0
8
0
0
0
0
0

Deinococcus-Thermus
3
0
3
0
0
0
0
0

Firmicutes
49
15
18
7
0
0
0
9

Fusobacteria
1
0
1
0
0
0
0
0

Planctomycetes
1
0
0
0
0
1
0
0

Alphaproteobacteria
38
0
38
0
0
0
0
0

Betaproteobacteria
23
0
23
0
0
0
0
0

Deltaproteobacteria
11
0
11
0
0
0
0
0

Epsilonproteobacteria
5
0
5
0
0
0
0
0

Gammaproteobacteria
52
0
49
0
0
3
0
0

Spirochaetes
5
0
4
0
0
1
0
0

Thermotogae
1
0
1
0
0
0
0
0











Total
235
15
189
16
0
6
0
9

All species were classified on the basis of the RNase H combinations shown in the Venn diagram in Figure 1.

Kochiwa et al. BMC Evolutionary Biology 2007 7:128   doi:10.1186/1471-2148-7-128