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31 October 2016 : Clinical Research  

Association of UGT2B7 and UGT1A4 Polymorphisms with Serum Concentration of Antiepileptic Drugs in Children

Zhongliang DuABG, Yukun JiaoCD, Lianting ShiEF

DOI: 10.12659/MSM.897626

Med Sci Monit 2016; 22:4107-4113

Abstract

BACKGROUND: This study aimed to analyze the relationship of UGT2B7 and UGT1A4 polymorphisms with metabolism of valproic acid (VPA) and lamotrigine (LTG) in epileptic children.

MATERIAL AND METHODS: We administered VPA (102) and LTG (102) to 204 children with epilepsy. Blood samples were collected before the morning dose. Serum concentration of LTG was measured by high-performance liquid chromatography (HPLC). Serum VPA concentration was tested by fluorescence polarization immunoassay. UGT2B7 A268G, C802T, and G211T polymorphisms, as well as UGT1A4 L48V polymorphism, were assayed by direct automated DNA sequencing after PCR. Evaluation of efficacy was conducted using the Engel method.

RESULTS: The adjusted serum concentration of VPA was 4.26 μg/mL per mg/kg and LTG was 1.56 μg/mL per mg/kg. Multiple linear regression analysis revealed that VPA or LTG adjusted concentration showed a good linear relation with sex and age. UGT2B7 A268G and C802T polymorphisms were demonstrated to affect the serum concentration of VPA (F=3.147, P=0.047; F=22.754, P=0.000). UGT1A4 L48V polymorphism was not related with the serum concentration of LTG (F=5.328, P=0.006). In the efficacy analysis, we found that C802T polymorphism exerted strong effects on efficacy of VPA (χ²=9.265, P=0.010). L48V polymorphism also showed effects on efficacy of LTG (χ²=17.397, P=0.001).

CONCLUSIONS: UGT2B7, UGT1A4 polymorphisms play crucial roles in metabolism of VPA and LTG.

Keywords: Anticonvulsants - blood, Adolescent, Asian Continental Ancestry Group, Base Sequence, Child, Child, Preschool, Epilepsy - genetics, Genetic Association Studies, Glucuronosyltransferase - metabolism, Multivariate Analysis, Polymorphism, Single Nucleotide, Regression Analysis, Triazines - blood, Valproic Acid - blood

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750