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Table 4 Mutation frequency in the lacZ and cII genes from the bone marrow of Muta™ mice treated with 2,5-, 2,6- and 3,5-DMAs

From: Mutagenic properties of dimethylaniline isomers in mice as evaluated by comet, micronucleus and transgenic mutation assays

Animal ID

lacZ

cII

Total plaquesa

Mutants

MF (×106)

Mean ± SD

Total plaquesa

Mutants

MF (×106)

Mean ± SD

Control (olive oil)

41

123,000

4

32.5

 

125,400

1

8.0

 

42

(88500)

5

56.5

 

227,400

4

17.6

 

43

(33000)

0

0

 

326,100

12

36.8

 

44

(32500)

0

0

 

(37500)

1

26.7

 

45

(60500)

2

33.1

 

(87000)

2

23.0

 

Total

337,500

11

32.6

32.5

803,400

20

24.9

20.8 ± 12.0

2,5-DMA

81

(42000)

7

166.7

 

122,700

2

16.3

 

82

320,500

26

81.1

 

422,400

6

14.2

 

83

238,500

17

71.3

 

374,400

19

50.7

 

84

215,000

5

23.3

 

162,000

8

49.4

 

85

(71500)

9

125.9

 

105,300

3

28.5

 

Total

887,500

64

72.1

58.6 ± 25.3

1,186,800

38

32.0

31.8 ± 15.7

2,6-DMA

91

155,000

12

77.4

 

272,100

3

11.0

 

92

120,000

17

141.7

 

216,300

14

64.7

 

93

676,000

12

17.8

 

240,300

4

16.6

 

94

(95500)

1

10.5

 

(91200)

3

32.9

 

95

584,500

31

53.0

 

509,700

24

47.1

 

Total

1,631,000

73

44.8

72.5 ± 45.2

1,329,600

48

36.1

34.9 ± 22.0

3,5-DMA

101

793,500

13

16.4

 

392,700

13

33.1

 

102

250,000

12

48.0

 

263,400

7

26.6

 

103

(55000)

4

72.7

 

121,800

6

49.3

 

104

(70000)

2

28.6

 

(95700)

2

20.9

 

105

119,500

5

41.8

 

140,100

4

28.6

 

Total

1,288,000

36

28.0

35.4 ± 13.7

1,013,700

32

31.6

34.4 ± 8.9

  1. MFs of lacZ gene were not statistically evaluated because total plaques of 4 animals in the control group were less than 100,000
  2. aData with at least 100,000 total plaques were evaluated by the statistical analysis and a parenthesis indicates exclusion