注意缺陷多动障碍与儿茶酚-O-甲基转移酶基因Val158Met多态性的关联分析

目的探讨注意缺陷多动障碍(attention-deficit hyperactivity disorder,ADHD)汉族患儿与儿茶酚-O-甲基转移酶(catechol-O-methyltransferase,COMT)基因第158位密码子G→A点突变所引起的缬氨酸→甲硫氨酸(Val158Met)的错义突变多态性的关系.方法采用聚合酶链反应-限制性片段长度多态性技术,分析了117例符合DSM-Ⅳ诊断标准的上海汉族ADHD患儿与105例正常健康对照组的COMT基因的Val158Met多态性位点频率.结果 ADHD组的A等位基因频率为25.21%,而对照组为23.81%,两组差异无显著性(χ2=0.5197, P＞0.05). COMT各基因型的分布频率在ADHD和对照组之间的差异也无显著性(P＞0.05).结论汉族儿童注意缺陷多动障碍COMT基因Val158Met多态性可能与ADHD无关联.

Association analysis between attention-deficit hyperactivity disorder and Val158Met polymorphism of catechol-O-methyltransferase gene

OBJECTIVE: To investigate the association between attention-deficit hyperactivity disorder (ADHD) in Han Chinese children and Val158Met polymorphism of catechol-O-methyltransferase (COMT) gene caused by the missense mutation of G158A in exon 4. METHODS: By using polymerase chain reaction-restriction fragment length polymorphisms the Val158Met polymorphism of COMT gene was tested in 117 children with the diagnosis of ADHD as defined by DSM-IV and in 105 healthy controls living in Shanghai. RESULTS: The frequencies of A allele were 25.21% and 23.81% in the ADHD group and the health controls respectively, which showed no significant difference between the two groups (Chi2=0.5197, P>0.05). There was also no significant difference in the distribution of all genotypes of COMT gene between the ADHD patients and the controls (P>0.05). CONCLUSION: It was suggested that for the Han Chinese children with ADHD in this study, there was no association between ADHD and Val158Met polymorphism of COMT gene.