目的探讨去整合蛋白和金属蛋白酶10(ADAM10)基因启动子区多态性与散发性阿尔茨海默病(sporadic Alzheimer’s disease,SAD)的相关性。方法采用随机数字表法抽取2000—2007年北京市宣武医院和秦皇岛市海港医院门诊10例SAD患者及10名健康对照者进行ADAM10基因启动子区测序,针对所发现的3个多态性位点,应用聚合酶链反应一限制性片段长度多态性的方法对315名健康对照者(对照组)及298例SAD患者(SAD组)进行基因型检测,并进行病例一对照相关性分析。结果在ADAM10基因启动子区共发现3个多态性位点:-279G/A(rs653765)、-630G/T(rs514049)和-921GAGA/-(rs33926666)。其中-921GAGA/-基因型频率[GAGA/GAGA:138(46.3%)、GAGA/-:155(52.0%)、-/-:5(1.7%)]和等位基因频率[GAGA:431(73.6%)、-:165(27.7%)]在SAD组和对照组之间差异有统计学意义(基因型:X^2=34.130,P:0.000;等位基因型:Х^2=25.972,P=0.000),-279G/A经ApoE分型后在不携带ApoEe4的亚组中,SAD组与对照组间的差异有统计学意义(基因型:x。=8.734,P=0.013;等位基因型:Х^2=5.129,P=0.024),-279G和-921GAGA为SAD相对保护性的等位基因,两者之间不存在连锁不平衡关系。结论ADAM10基闪启动子区-279G/A和-921GAGA/-多态性与SAD的发病具有一定的相关性,-279G/G基因型和-921GAGA/GAGA基因型对SAD的发病可能具有一定的保护作用。
Objective To investigate the relationship between the polymorphisms of the promoter of a disintegrin and metalloproteinase 10(ADAM10) gene and sporadic Alzheimer' s disease (SAD). Methods The promoter of ADAM10 gent in 10 controls and 10 SAD patients was sequenced. Three variations were found, then these variations in 298 SAD patients (SAD group) and 315 healthy controls (control group) were genotyped by using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Results Three polymorphisms were found in the promoter of ADAM10 gene : - 279G/A ( rs653765 ) , - 630G/T( rs514049 ) and - 921GAGA/- ( rs33926666 ). For - 921GAGA/- , there were significant differences in genotype (GAGA/GAGA: 138 (46. 3% ), GAGA/- : 155 (52. 0% ), -/- : 5 (1.7%) ) and allele frequencies (GAGA: 431 (73.6%), - : 165 (27.7%) ) between SAD and control (genotype: X^2 =34. 130, P = 0.000; allele: X^2 = 25.972, P = 0.000) . For - 279G/A, there were significant differences in genotype and allele frequencies between SAD and control in the subjects without ApoEe4 allele (genotype: X2=8.734, P=0.013; allele: X^2 =5. 129, P=0.024). -279G and -921GAGA were relatively protective allele types for SAD, and they were not in linkage disequilibrium. Conelusion The polymorphisms -279G/A and -921GAGA/- of ADAM10 are associated with SAD. Allele G or genotype G/G of -279G/A and the GAGA/GAGA genotype or the GAGA allele of -921GAGA/- might have a protective effect on SAD.