Table 1

Li93 analysis of a selection of cytochrome b561-encoding genes

K_s

K_a

K_a/K_s

Synonymous rate

Nonsynonymous rate

Plant paralogs

Artb561-1

Artb561-2

2.00

0.49

0.245

Artb561-1

Artb561-3

2.90

0.57

0.197

Artb561-1

Artb561-4

1.75

0.55

0.314

Artb561-3

Artb561-4

2.93

0.75

0.256

Artb561-2

Artb561-4

0.47

0.63

1.340

Mouse paralogs

Mumb561-1

1.9

0.61

0.321

Mumb561-1

Mumb561-3

1.71

0.51

0.298

Mumb561-2

Mumb561-3

2.01

0.5

0.249

Dicot versus monocot

Average

0.37 ± 0.09

0.43 ± 0.06

1.22 ± 0.38

2.88 ± 0.69

3.33 ± 0.45

Within dicots

Average

-

-

-

12.63 ± 2.41

2.38 ± 1.18

Exception

Crpb561

Sotb561

0.48

0.53

1.10

11.75

13.25

Tunicate versus vertebrates

Average

0.65 ± 0.13

0.78 ± 0.12

1.26 ± 0.45

1.21 ± 0.24

1.45 ± 0.22

Human versus mouse

Hosb561-1

Mumb561-1

0.12

0.19

1.583

1.20

1.90

Hosb561-2

Mumb561-2

0.47

0.16

0.340

4.70

1.60

Hosb561-3

Mumb561-3

0.48

0.07

0.146

4.80

0.70

K_s, synonymous substitutions; K_a, nonsynonymous substitutions. The rate of synonymous and nonsynonymous substitutions (right-hand columns) is expressed as 10^-9 substitutions/position/year. The estimated divergence times between different branches used for these calculations are 130 × 10⁶ years for monocots-dicots [27], 12 × 10⁶ years for tomato-potato [44], 540 × 10⁶ years for tunicate-vertebrates [30], and 100 × 10⁶ years for human-mouse [45]. Divergence times for different dicot families are estimated from Figure 2 in [29]: 90 million years for Fabales (M. truncatula), Caryophyllales (B. vulgaris, M. crystallinum) and Malvales (G. hirsutum), 40 million years for Lamiales (C. plantagineum) and Solanales (S. tuberosum), and 20 million years for the radiation within the Fabales (M. truncatula and G. max).

Verelst and Asard Genome Biology 2003 4:R38   doi:10.1186/gb-2003-4-6-r38