5-HT2A受体T102C基因多态性与儿童注意缺陷多动障碍的相关性

目的 探讨儿童注意缺陷多动障碍（ADHD）及其表型与5－HT2A受体基因T102C多态性之间的关联。方法 对323例中国汉族ADHD患儿、195个核心家系及182名正常对照,就5－HT2A受体基因T102C多态性进行检测和关联分析。结果 （1）ADHD混合型患儿T102T基因型明显少于正常对照（22．3％vs 33.5%,OR=0.569,P=0.028,95%CI 0.344-0.943),而T102C基因型明显多于正常对照（64．0％ vs 47.3%,OR=1.987,P=0.003,95^ CI 1.264-3.124),(2)ADHD混合型女孩组T102C等位基因传递不平衡。结论 （1）T102T基因型是ADHD混合型的保护因子,T102C基因型是ADHD混合型的风险因子,（2）5－HT2A受体基因T102C多态性位点的102C等位基因可能是女孩ADHD混合型发病的易感基因。

Association of 5-HT(2A) receptor polymorphism and attention deficit hyperactivity disorder in children

OBJECTIVE: To stude the association of 5-HT(2A) receptor polymorphism and attention deficit hyperactivity disorder (ADHD) in children. METHODS: Blood samples were taken from 323 6 approximately 17.5-year-old children with ADHD disgnosed based on the DSM-IV criteria, 182 healthy 18 approximately 49-year-old controls, and 195 pairs of parents of affected children, all of Han nationality. DNA was extracted. PCR was performed to examine the 5-hydroxytryptamine (5-HT)(2A) receptor T102C polymorphism. Transmission disequilibrium test (TDT) was used to test the association of alleles of 5-HT(2A) T102C polymorphic sites and AFDHD. RESULTS: The frequency of T102T in patients with ADHD combined subtype was lower than that in the controls (22.35 vs 33.5%, OR = 0.569, P = 0.028, 95% CI 0.344 - 0.943), and the frequency of T102C in patients with ADHD combined subtype was higher than that in the controls (64.0% vs 47.3%, OR = 1.987, P = 0.003, 95% CI 1.264 approximately 3.124). TDT showed biased transmission of the alleles of T102C polymorphism among families of girl patients with ADHD combined subtype (P = 0.031). CONCLUSION: For the ADHD combined subtype, the T102T genotype is a protective factor and the T102C genotype is a risk factor. For the girl with ADHD combined subtype, the allele C102 is a disease-predisposing gene.