Objective To evaluate the association of GGN repeat polymorphism of androgen receptor(AR)with ovarian reserve and ovarian response in controlled ovarian stimulation(COS).Methods This genetic association study was conducted among a total of 361 women aged≤40 years with basal FSH≤12 U/L undergoing the GnRH-agonist long protocol for COS in a university affiliated IVF center.GGN repeat in the AR gene was analyzed with Sanger sequencing.The primary endpoint was the number of antral follicle counts(AFCs),and the secondary endpoints were stimulation days,total dose of gonadotropin(Gn)used,total number of retrieved oocytes,ovarian sensitivity index,and follicular output rate.Results The GGN repeat in exon 1 of the AR gene ranged from 13 to 24,and the median repeat length was 22.Based on the genotypes(S for GGN repeats<22,L for GGN repeats≥22),the patients were divided into 3 groups:SS,SL,and LL.Generalized regression analysis indicated that the number of AFCs in group SS was significantly lower than those in group SL(adjusted β=1.8,95%CI:0.2-3.4,P=0.024)and group LL(adjusted β=1.5,95%CI:0.2-2.7,P=0.021).No significant difference was observed in the number of AFCs between group SL and group LL(P>0.05).Generalized regression analysis indicated no significant differences in ovarian stimulation parameters among the 3 groups,either before or after adjusting for confounding factors(P>0.05).Conclusion GGN repeat length on the AR gene is associated with AFC but not with ovarian response in Chinese women,indicating that AR gene polymorphisms may affect ovarian reserve.
LIU XinyanFAN QiDENG MingfenXU YanGUO JingCAO PingZHOU CanquanXU Yanwen
目的系统构建雄激素受体(AR)野生型全长和4个功能域截短体的原核表达质粒,Western blot与凝胶迁移(EMSA)实验鉴定各融合蛋白及其功能。方法基于pGEX-4T-1载体,构建AR全长及各功能域的谷胱甘肽巯基转移酶(GST)融合表达重组质粒。应用异丙基-β-D-硫代半乳糖苷(IPTG)对重组质粒进行诱导表达,确定各重组蛋白的最佳参数。分别用AR内源性抗体和GST标签抗体进行Western blot鉴定,分析诱导前、诱导后细菌裂解液中的目的蛋白,并利用谷胱甘肽琼脂糖树脂进一步纯化。将纯化后蛋白与病毒荧光探针进行孵育,复合物于非变性凝胶中电泳检测纯化蛋白功能。结果成功构建了AR全长和3个功能域截短体的原核表达质粒。PCR和双酶切鉴定均显示在各插入片段大小相符处出现阳性条带,且测序结果与NCBI GenBank标准株比对一致。其中,96 ku GST-AR-NTD+DBD与86 ku GST-AR-NTD两个融合蛋白得以成功表达及后续纯化。纯化蛋白可与病毒基因组DNA直接结合。结论来源同一基因序列的AR截短体重组质粒原核表达条件不同,纯化后的AR蛋白可用于深入了解AR各功能域与其他分子间的直接相互作用机制。