摘要
峰值骨密度是由遗传和环境因素及其相互作用共同决定的复杂性状.维生素D受体基因、雌激素α受体基因、白介素6基因、副甲状腺素基因、Ⅰ型胶原α2基因、骨钙素基因、α2巯基糖蛋白基因是与骨代谢相关的7个重要的候选基因.本研究旨在检测这7个候选基因之间的相互作用对中国女性峰值骨密度的影响.样本为中国上海的361个无关、健康的绝经前女性,均为汉族人,年龄为20~44岁.采用Hologic QDR 2000+双能X射线扫描仪对腰椎与髋部的骨密度进行了检测.采用聚合酶链式反应-限制性片段长度多态分析方法对每个个体的以下8个多态性标记位点进行基因分型:维生素D受体基因的Apa Ⅰ位点,雌激素α受体基因的PvuⅡ和Xba Ⅰ位点,白介素6基因的BsrB Ⅰ位点,副甲状腺素基因的BstB Ⅰ位点,Ⅰ型胶原α2基因的Msp Ⅰ位点,骨钙素基因的HindⅢ位点,α2巯基糖蛋白基因的Sac Ⅰ位点.采用二元方差分析对基因相互作用与骨密度的关系进行研究.结果表明,白介素基因和雌激素α受体基因(PvuⅡ)的相互作用对髋部(P=0.019)、转子间区(P=0.016)和股骨颈(P=0.019)的骨密度有显著作用.在这3个部位,GGPp基因型携带者比GGPP基因型携带者的骨密度值分别高出18.0%、19.5%和14.8%.另外观察到α2巯基糖蛋白基因与白介素6基因的相互作用对股骨颈骨密度有显著影响(P=0.046).GGSS基因型携带者的股骨颈骨密度值比GGSs基因型携带者高出18.8%.该项群体水平的统计分析表明:对于中国女性峰值骨密度的遗传决定,白介素基因和雌激素α受体基因、α2巯基糖蛋白基因的相互作用显著.
Peak bone mass (PBM) is a complex trait,determined by both genetic and environmental factors and also their interactions. Vitamin D receptor (VDR) ,estrogen receptor a (ERα) ,interleukin 6 (IL6) ,parathyroid hormone (PTH),collagen type 1 alpha 2 (COL1A2),bone Gla protein (BGP),alpha2-HS glycoprotein (AHSG) are among the important candidate genes of bone metabolism. The study aims to detect significant effect of potential inter-genic action underlying PBM in Chinese females. 361 unrelated healthy premenopausal Chinese females ( aged 20 -44 years) with Han ethnicity were recruited from the Shanghai city in China. Bone mineral density (BMD) at the hip and the lumbar spine ( L1 -4) was measured using a Hologic QDR 2000 + dualenergy X-ray absorptiometry (DXA) scanner. Eight polymorphisms among the seven genes were genotyped, i.e. Apa Ⅰ in VDR,PvuⅡ and Xba Ⅰ in ERα ( ERX and ERP,respectively) ,BsrB Ⅰ in IL6,BstB Ⅰ in PTH, Msp Ⅰ in COL1A2,Hind Ⅲ in BGP, and SacⅠ in AHSG, using PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism) methods. Two-way analysis of variance (ANOVA) showed significant effects of IL6 × ERP interaction on PBM at the total hip (P=0.019) ,intertrochanter ( P=0. 016) ,and femoral neck ( P =0.019). The BMD difference between GGPp carriers and GGpp subjects (at these two loci) amounted to 18.0%, 19.5%, and 14.8% at the hip, intertrochanter, and femoral neck, respectively. The potential interaction effect of AHSG × IL6 was observed on femoral neck PBM ( P = 0. 046). GGSS individuals ( at these two loci) had, on average, 18.8% higher femoral neck BM D than those subjects with GGSs genotype. The population-level statistical analysis indicates that IL6 × ERP and AHSG × IL6 have significant inter-genic effect on the genetic determination of PBM in Chinese females.
基金
国家杰出青年科学基金(编号:30025025)
国家自然科学基金重点项目(编号:30230210)资助~~
关键词
峰值骨密度
基因
相互作用
方差分析
peak bone mass (PBM)
gene
interaction
analysis of variance