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Table 3 The mutations found in patients carrying only one heterozygous mutation.

From: Mild forms of hypophosphatasia mostly result from dominant negative effect of severe alleles or from compound heterozygosity for severe and moderate alleles

Patient

Mutation

Residual activity (%WT)

Dominant negative effect (%WT)

Parent carrier

Clinical symptoms in the parent carrier

Haplotypes

Trans

or cis

Clin. form

1

p.G456W

0.8

14.5

F

no

A/A

-

Ch

2

p.G420A

4.2

19.7

?

no

A/C

-

Od

3

p.D378V

1.2

19.9

F

no

A/E

Cis likely

Ch

4

p.L414M

0.4

23.5

M

?

A/C

-

Od

5

p.P108L

1.9

24.0

M

yes

A/E

trans

Od

6

p.N417S

3.0

26.5

M

no

A/A

-

Od

7

p.N417S

3.0

26.5

F

yes

A/E

trans

Od

8

p.N417S

3.0

26.5

?

no

A/A

-

Ad

9

p.N417S

3.0

26.5

F

yes

A/A

-

Od

10

p.E452K

1.4

27.5

M

yes

A/B

-

Ad

11

p.T100M

1.3

28.2

M

no

A/E

Cis

Ch

12

p.R391H

0

29.1

?

?

B/E

Cis

Od

13

p.V382I

0a

30a

F

yes

A/J

-

Pb

14

p.R71H

1.0

30.5

?

no

A/B

-

Od

15

p.R71H

1.0

30.5

M

?

A/B

-

Od

16

p.R71H

1.0

30.5

M

no

A/C

-

Od

17

p.R71H

1.0

30.5

M

yes

E/E

Cis/trans

Od

18

p.E429K

1.3

31.0

F

no

B/E

Trans

Od

19

p.G339R

1.1

33.0

F

no

A/B

-

Od

20

p.G339R

1.1

33.0

F

yes

A/B

 

Od

21

p.G339R

1.1

33.0

M

yes

B/E

Trans

Od

22

p.R71C

2.5

35.0

F

no

A/A

-

Od

23

p.R71C

2.5

35.0

M

no

A/C

-

Od

24

p.S445P

2.1

35.1

?

?

A/C

-

Ad

25

p.R184W

0.6

36.7

?

?

A/A

-

Ad

26

p.R184W

0.6

36.7

M

no

A/A

-

Od

27

p.R184W

0.6

36.7

F

yes

A/B

-

Ch

28

p.R184W

0.6

36.7

M

no

A/E

Trans

Od

29

p.N478I

1.5

38.2

?

no

A/B

-

Ch

30

p.G334R

5.0

39.0

?

no

A/C

-

Od

31

p.E476A

0.4

39.3

M

?

A/E

Trans

Ad

32

p.G334D

1.7

40.0

P

no

A/E

Cis

Od

33

p.A116T

0.6

40.0

M

yes

A/E

Trans

Od

34

p.I72T

5.1

40.2

M

no

A/B

-

Od

35

p.V459L

0

41.1

?

yes

A/A

-

Od

36

p.G122S

4.5

43.6

F

?

A/A

-

Od

37

p.A111T

2.0

48.7

F

yes

E/E

Cis/trans

Od

38

p.R391C

3.75

50.5

M

?

B/E

Trans

Ch

39

p.G456R

1.5

50.5

?

no

A/D

-

Ad

40

p.G456R

1.5

50.5

?

yes

A/A

-

Od

41

p.G456R

1.5

50.5

F

?

A/E

Cis

Ch

42

p.A443V

1.38

53.1

?

no

A/A

-

Ad

43

p.A176T

30.2

58.0

?

?

A/A

-

Ad

44

p.R136H

33.4

70.0

?

?

A/E

-

Ad

45

p.G249V

34.5

70.5

F

yes

A/C

-

Ch

46

p.I490F

37.1

77.4

?

no

A/E

-

Ad

47

p.E191K

56.0

79.5

M

no

A/A

-

Od

  1. The dominant negative effect was measured by co-transfecting wild type (WT) and mutant cDNAs in COS cells and assaying the AP activity. Absence of dominant negative effect is expected to product 50% of WT activity. Parent carrier: F = father; M = mother. Haplotypes correspond to the haplotypes made of the 8 intragenic SNPs studied (see Material and Methods) found in the patient. Trans/Cis indicates the position of the haplotype E regarding to the mutation. Clin. Form = clinical form of the patient.
  2. a As reported by Takinami et al. 2004 [11]