Table 3 Methylation status in the ABO gene promoter region and expression of A antigen

From: Loss of blood group A antigen expression in bladder cancer caused by allelic loss and/or methylation of the ABO gene

No.

Case

Genotype

LOH a

Methylation status b

Methylation status (%) c

RE 7 d

Expression of A antigen

     

re 1

re 2

re 3

re 4

re 5

re 6

  

1

37

A/O2

O2

Full

+(100)

+(100)

+(100)

+(100)

+(100)

+(71)

+

2

65

A/B

B

Full

+(100)

+(100)

+(100)

+(86)

+(100)

+(97)

+

3

72

A/O1

O1

Full

+(70)

+(62)

+(85)

+(57)

+(87)

+(61)

+

4

228

A/B

Ret

Full

+(100)

+(100)

+(100)

+(100)

+(100)

+(100)

+

5

85

A/O1

O1

Partial

+(85)

+(69)

+(100)

+(100)

+

6

235

A/O1

O1

Partial

+(85)

+(100)

+

7

10

A/O2

Ret

Partial

+(23)

8

186

A/O2

Ret

Partial

+(62)

+(38)

9

220

A/O1

O1

Partial

+(62)

10

229

A/O1

O1

Partial

+(46)

11

226

A/O2

Ret

Partial

+(62)

+/−

12

40

A/O1

Ret

Partial

+(100)

+(100)

+(100)

+

13

141

A/O2

O2

Partial

+(100)

+(100)

+(100)

+

14

5

A/O2

O2

No

15

43

A/O1

O1

No

16

77

A/O2

O2

No

17

97

A/O2

O2

No

18

195

A/O1

Ret

No

19

7

A/A

NI

No

20

71

A/B

B

No

+

+/−

21

184

A/O2

O2

No

+

+/−

22

183

A/B

Ret

No

+

+/−

23

212

A/O2

Ret

No

+/−

24

225

A/B

Ret

No

+/−

25

3

A/A

NI

No

+/−

26

98

A/A

NI

No

+/−

27

78

A/O2

Ret

No

+

28

79

A/O2

Ret

No

+

29

94

A/O1

Ret

No

+

30

185

A/O2

Ret

No

+

31

193

A/B

Ret

No

+

32

221

A/O1

Ret

No

+

33

222

A/O2

Ret

No

+

34

45

A/A

NI

No

+

35

80

A/A

NI

No

+

  1. aThe cases in which A allele was retained were shown.
  2. bFull methylation indicates all the regions were methylated, Partial; at least one regions were methylated, No; all the regions were ummethylated by SSCP analysis.
  3. cNumbers in parentheses indicate the proportion of CpG sites methylated in the amplified DNA fragments.
  4. dMethylation was analyzed using MSP.