AIM: Carbamazepine (CBZ) is one of the most widely used antiepileptic drugs. The aim of the present study is to investigate the impacts of polymorphisms in genes related to pharmacokinetic and pharmacodynamic pathways of CBZ on the large interindividual variability in dosages and concentrations. METHODS & RESULTS: Genetic polymorphisms in the candidate genes were detected in 234 epileptic patients under maintenance CBZ monotherapy by real-time PCR and PCR-RFLP. Results of statistical analysis demonstrated that carriers of the variant SCN1A IVS5-91G>A and EPHX1 c.337T>C allele tended to require higher CBZ dosages and lower ln(concentration-dose ratios) than noncarriers (p < 0.0001) and the homozygous carriers also seemed to require higher CBZ dosages and lower ln(concentration-dose ratios) (p < 0.0001). In addition, the multiple regression model of concentration-dose ratio of CBZ also revealed that genetic variants in SCN1A, EPHX1 and UGT2B7 genes interactively affect the concentration-dose ratio of CBZ (adjusted r(2) = 55%). CONCLUSION: The present study identified genetic factors associated with CBZ therapy optimization and provided useful information for individualized CBZ therapy in epileptic patients. Further studies in larger populations are needed to confirm our results.
AIM: Carbamazepine (CBZ) is one of the most widely used antiepileptic drugs. The aim of the present study is to investigate the impacts of polymorphisms in genes related to pharmacokinetic and pharmacodynamic pathways of CBZ on the large interindividual variability in dosages and concentrations. METHODS & RESULTS: Genetic polymorphisms in the candidate genes were detected in 234 epilepticpatients under maintenance CBZ monotherapy by real-time PCR and PCR-RFLP. Results of statistical analysis demonstrated that carriers of the variant SCN1A IVS5-91G>A and EPHX1 c.337T>C allele tended to require higher CBZ dosages and lower ln(concentration-dose ratios) than noncarriers (p < 0.0001) and the homozygous carriers also seemed to require higher CBZ dosages and lower ln(concentration-dose ratios) (p < 0.0001). In addition, the multiple regression model of concentration-dose ratio of CBZ also revealed that genetic variants in SCN1A, EPHX1 and UGT2B7 genes interactively affect the concentration-dose ratio of CBZ (adjusted r(2) = 55%). CONCLUSION: The present study identified genetic factors associated with CBZ therapy optimization and provided useful information for individualized CBZ therapy in epilepticpatients. Further studies in larger populations are needed to confirm our results.
Authors: Larry Baum; Batoul Sadat Haerian; Ho-Keung Ng; Virginia C N Wong; Ping Wing Ng; Colin H T Lui; Ngai Chuen Sin; Chunbo Zhang; Brian Tomlinson; Gary Wing-Kin Wong; Hui Jan Tan; Azman Ali Raymond; Zahurin Mohamed; Patrick Kwan Journal: Hum Genet Date: 2013-12-13 Impact factor: 4.132
Authors: Vincent L M Yip; Henry Pertinez; Xiaoli Meng; James L Maggs; Daniel F Carr; B Kevin Park; Anthony G Marson; Munir Pirmohamed Journal: Br J Clin Pharmacol Date: 2020-12-14 Impact factor: 4.335