探讨载脂蛋白B(apolipoprotein B,apoB)基因单体型与维吾尔族自然长寿之间的关系.选择新疆和田地区191名年龄90岁以上的健康维吾尔族个体为研究对象,另选53名年龄65—70岁、民族、性别、地域相匹配的正常个体为对照.采用PCR—SSP(sequence specific primer),PCR—RFLP(restriction fragment length polymorphism)和PCR-直接测序(PCR—sequencing)等技术对apoB基因第1外显子5'端信号肽插入/缺失(insertion/deletion,PD)、第26外显子Xba Ⅰ限制性片段长度多态性(restriction fragment length polymorphisms,Xba Ⅰ—RFLP)和第29外显子3'端可变数目重复序列(vaffable number of tandemly repeat,VNTR)进行分型.经Logistic回归分析显示,长寿组apoB基因X^+X^+基因型频率显著高于对照组;M,L的等位基因频率和其组成的基因型频率显著增高;在单体型分析中,长寿组中由X^+和M等位基因组成的单体型频率显著增高,而由X^-和S等位基因组成的单体型频率显著降低(均P〈0.05).研究认为:等位基因M,L,基因型X^+X^+,MM,ML,LL和单体型I—X^+-M,X^+-M与自然长寿显著正相关,可能为长寿的保护因素,而等位基因S,基因型SS和单体型X^+-S,D—S和D—X^+-S则可能是影响长寿的不利因素.
Objective To confirm previous effort to identify type 2 diabetes susceptibility genes in a Northern Chinese population by conducting a new genome scan with both an increased number of type 2 diabetes families and a n...
详细信息
Objective To confirm previous effort to identify type 2 diabetes susceptibility genes in a Northern Chinese population by conducting a new genome scan with both an increased number of type 2 diabetes families and a new set of microsatellite markers within the previously localized *** A genome scan method was applied. After multiplexed PCR, electrophoreses, genescan and genotyping analysis, we obtained size information for all loci , and then a further study was done by both parametric and non-parametric linkage analysis to investigate the P values and Z values of these *** We surveyed 34 microsatellite markers which distributed within 5 regions along chromosome 1, and a total of 12?000 genotypes were screened. Evidence of linkage with diabetes was identified for 8 of the 34 loci. All P values of the 8 loci were lower than 0.05, and the highest Z value was 2.17. A very interesting finding is that all 5 markers at the p- terminal 1p36.3-1p36.23 region, spanning a long range of 16.9?cM, were identified to have a low P value of less than 0.05, which suggests that this region may contain multiple susceptibility genes. Regions 4 and 5 also confirmed the previous findings, and we narrowed these two regions to a 2.7?cM and 2.5?cM regions, *** We further confirmed the results gained in the previous genome-wide scan using an increased number of NIDDM families and a new set of microsatellite markers lying within the initially localized regions. The fact that all 5 loci at the p- terminal region displayed a low P value of less than 0.05 suggests that more than 1 susceptibility gene may reside in this region.
暂无评论