Table 3.

SAM, SAH, SAM/SAH ratio, and DNA hypomethylation in brain


Genotype and diet

SAM, nmol/g

SAH, nmol/g

SAM/SAH

Global DNA hypomethylation, dpm/0.5μg DNA
Mthfr+/+     
   Control   13.0 ± 0.5 (23)   1.70 ± 0.16 (23)   8.73 ± 0.64 (23)   1537 ± 267 (7)  
   HM   16.2 ± 1.9 (19)*  2.86 ± 0.28 (19)*  6.56 ± 0.84 (19)*  2037 ± 520 (7)  
   LF   12.0 ± 0.8 (8)   3.68 ± 0.32 (8)*  3.44 ± 0.35 (8)*  1524 ± 226 (6)  
   HM/LF   13.4 ± 1.0 (8)   3.04 ± 0.28 (8)*  4.58 ± 0.41 (8)*  2663 ± 951 (4)  
Mthfr+/-     
   Control   14.1 ± 0.9 (22)   2.41 ± 0.22 (22)  6.56 ± 0.45 (22)  1843 ± 306 (8)  
   HM   14.5 ± 0.9 (19)   2.47 ± 0.19 (19)   6.50 ± 0.70 (19)   3571 ± 908 (4) 
   LF   12.0 ± 0.7 (7)   3.59 ± 0.29 (7)*  3.51 ± 0.31 (7)*  2599 ± 350 (6)  
   HM/LF
 
13.1 ± 1.1 (8)
 
3.70 ± 0.36 (8)*
 
3.73 ± 0.38 (8)*
 
2358 ± 449 (8)
 

Genotype and diet

SAM, nmol/g

SAH, nmol/g

SAM/SAH

Global DNA hypomethylation, dpm/0.5μg DNA
Mthfr+/+     
   Control   13.0 ± 0.5 (23)   1.70 ± 0.16 (23)   8.73 ± 0.64 (23)   1537 ± 267 (7)  
   HM   16.2 ± 1.9 (19)*  2.86 ± 0.28 (19)*  6.56 ± 0.84 (19)*  2037 ± 520 (7)  
   LF   12.0 ± 0.8 (8)   3.68 ± 0.32 (8)*  3.44 ± 0.35 (8)*  1524 ± 226 (6)  
   HM/LF   13.4 ± 1.0 (8)   3.04 ± 0.28 (8)*  4.58 ± 0.41 (8)*  2663 ± 951 (4)  
Mthfr+/-     
   Control   14.1 ± 0.9 (22)   2.41 ± 0.22 (22)  6.56 ± 0.45 (22)  1843 ± 306 (8)  
   HM   14.5 ± 0.9 (19)   2.47 ± 0.19 (19)   6.50 ± 0.70 (19)   3571 ± 908 (4) 
   LF   12.0 ± 0.7 (7)   3.59 ± 0.29 (7)*  3.51 ± 0.31 (7)*  2599 ± 350 (6)  
   HM/LF
 
13.1 ± 1.1 (8)
 
3.70 ± 0.36 (8)*
 
3.73 ± 0.38 (8)*
 
2358 ± 449 (8)
 

Values shown are mean ± SEM. Numbers in parentheses indicate the number of animals in the group.

*

P < .05 versus animals of the same genotype fed the control diet

P < .05 versus Mthfr+/+ genotype

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