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目的 研究家族成员中反复腹痛和无腹痛者的幽门螺杆菌(Helicobacter priori,Hp)感染和人类白细胞抗原(HLA)-DQA1等位基因频率分布.方法 将反复腹痛患儿为核心的20个家庭118名同代、一级和二级亲属分为反复腹痛组和无腹痛组,应用胶体金标免疫渗滤法和免疫印迹法检测118名家族成员血Hp-IgG抗体和亚型.用聚合酶链反应-序列特异性引物(PCR-SSP)方法对2组进行HLA-DQA1等位基因分型.样本的分布经过Hardy-Weinberg平衡检验,P>0.05,组间HLA-DQA1等位基因比较采用四格表X2检验.结果 20个家族中Hp抗体和Hp亚型阳性率分别为100%和96.6%,Ⅰ型Hp感染占55.1%(65/118),Ⅱ型Hp感染为41.5%(49/118).反复腹痛组HLADQA1*0302的等位基因频率明显高于无腹痛组,2组比较差异有统计学意义(23%vs.2%,X2=13.277,P=0.000).结论 在Hp感染的家族成员中,反复腹痛者与无腹痛者之间存在免疫遗传学差异,HLA-DQA1*0302可能是Hp感染后反复腹痛的相关基因.

Objective To investigate Helicobacter pylori(Hp)infection and HLA-DQA1 allelic frequency in family members of children with recurrent abdominal pain.Methods One hundred and eighteen family members of 20 children with recurrent abdominal pain were divided into two groups:with and without recurrent abdominal pain.Serum Hp antibody was tested by dot immunogold filtration assay and immunophenotyping was determined by Western blot(immunobiot)technique.Polymerase chain reactionsequence specific primers(PCR-SSP)technique Was applied to identify HLA-DQAi allelic frequencies.Hardy-Weinberg equilibrium test was performed(P>0.05),and Chi-square test was used to compare the frequency of HLA-DQA1 alleles between the groups.Results The Hp seropositive rate in 118 members Was 100%and the Hp immunophenotyping was 96.6%.The prevalence of Hp Ⅰ and Ⅱ type was 55.1%(65/118)and41.5%(49/118).HLA-DQA1*0302 allelic frequency Was significantly higher in subjects with recurrent abdominal pain than that in subjects without one(23%vs.2%,X2=13.277,P=0.000).Conclusion There is immunogenetic difference between familial members with and without recurrent abdominal pain infected by Hp,and HLA-DQA1*0302 may be the associated gene contributing to different clinical outcomes after Hp infections.