中国汉族人群γ-氨基丁酸A类受体基因簇与孤独症的关联研究

摘要

目的:探讨染色体15q12区域γ-氨基丁酸A类受体基因簇的单核苷酸多态性与中国汉族孤独症人群的遗传关联.方法:选取502个中国汉族孤独症核心家系(包括502例患者及健康的生物学父母1004例),孤独症儿童符合美国精神障碍诊断与统计手册第4版(DSM-Ⅳ)孤独症诊断标准.通过Agena Bioscience质谱检测平台,对γ-氨基丁酸A类受体基因簇中GABRB3、GABRA5和GABRG3基因的15个标签单核苷酸多态性位点进行基因分型.在孤独症核心家系中进行以家系为基础的关联检验,比较父母携带的杂合型等位基因传递给孤独症子代的概率.结果:位于GABRG3基因单核苷酸多态性位点rs7180500的等位基因C和位于GABRB3基因单核苷酸多态性位点rs4906902的等位基因A存在父母向孤独症子代的优先传递(Z=3.573,P＜0.001;Z=3.141,P=0.002);经Bonferroni校正后仍具有统计学意义.结论:在中国汉族人群中,位于染色体15q12区域的GABRG3和GABRB3基因可能是孤独症的易感基因.%Objective:To investigate the genetic association of single nucleotide polymorphisms (SNPs) in gamma-aminobutyric acid type A (GABAA) receptor genes cluster on chromosome 15q12 with autism in Chinese Han population.Methods:Totally 502 autism trios of Chinese Han ethnicity (including 502 autism individuals and 1004 healthy biological parents) were selected.All children met the autism diagnosis of Diagnostic and Statistical Manual of Mental Disorders,Fourth edition (DSM-Ⅳ).Genotyping for 15 selected tag SNPs in three GABAA receptor genes (GABRB3,GABRA5,and GABRG3) was performed using Agena Bioscience MassARRAY platform.The family-based association test for 15 tag SNPs was performed to compare the transmitted frequency of al leles of heterozygous genotypes from parents to offspring in autism trios.Results:The C allele of rs7180500 in GABRG3 and the A allele of rs4906902 in GABRB3 exhibited the preferential transmission from parents to affected offspring (Z =3.573,P ＜0.001;Z =3.141,P =0.002),and the association was significant after Bonferroni correction.Conclusion:It suggests that GABRG3 and GABRB3 which located in chromosome 15q12 might be susceptibility genes in Chinese Han population.