2.7.6.2 D100N mutation reduces turnover-number markedly 642743 2.7.6.2 D133N mutation causes a selective decrease in the ratio of turnover-number to Km-value for thiamine 642743 2.7.6.2 D222H naturally occurring homozygous TPK1 mutation in a patient with enzyme deficiency suffering neurological disorder 739080 2.7.6.2 D71N mutation reduces turnover-number markedly 642743 2.7.6.2 D73N mutation reduces turnover-number markedly 642743 2.7.6.2 additional information construction of a double knockout mutant lacking isozymes TPK1 and TPK2, the mutant shows severely depressed levels of TPP and elevated levels of free thiamine compared to the wild-type enzyme 676560 2.7.6.2 additional information three common intronic variants in the maternal and fetal thiamine pyrophosphokinase gene (TPK1) are associated with birth weight, overview 695592 2.7.6.2 Q96E mutation causes an 2.5fold increase in the ratio of turnover-number to Km-value for thiamine compared to the wild-type 642743 2.7.6.2 R131G mutation decreases the ratio of turnover-number to Km-value for ATP 642743 2.7.6.2 S160L naturally occurring homozygous TPK1 mutation in a patient with enzyme deficiency suffering neurological disorder. Early thiamine supplementation prevents encephalopathic episodes and improved developmental progression of Patient 1, emphasizing the importance of early diagnosis and treatment of TPK deficiency. The p.Ser160Leu mutation is predicted to interferewith TPK dimerization, which may be another mechanism for the disease 739080