The 5-HT2c receptor gene Cys23Ser polymorphism influences the intravaginal ejaculation latency time in Dutch Caucasian men with lifelong premature ejaculation

It has been postulated that the persistent short intravaginal ejaculation latency time （IELT） of men with lifelong premature ejaculation （LPE） is related to 5-hydroxytryptamine （HT）2c receptor functioning. The aim of this study was to investigate the relationship of Cys23Ser 5-HT2c receptor gene polymorphism and the duration of IELT in men with LPE. Therefore, a prospective study was conducted in 64 Dutch Caucasian men with LPE. Baseline IELT during coitus was assessed by stopwatch over a 1-month period. All men were genotyped for Cys23Ser 5-HT2c receptor gene polymorphism. Allele frequencies and genotypes of Cys and Ser variants of 5-HT2c receptor gene polymorphism were determined. Association between Cys/Cys and Ser/Ser genotypes and the natural logarithm of the IELT in men with LPE were.investigated. As a result, the geometric mean, median and natural mean IELT were 25.2, 27.0, 33.9s, respectively. Of all men, 20.0%, 10.8%, 23.1% and 41.5% ejaculated within 10, 10-20, 20-30 and 30-60s after vaginal penetration. Of the 64 men, the Cys/Cys and Ser/Ser genotype frequency for the Cys23Ser polymorphism of the 5-HT2c receptor gene was 81% and 19%, respectively. The geometric mean IELT of the wildtypes （Cys/Cys） is significantly lower （22.6s; 95% CI 18.3-27.8s） than in male homozygous mutants （Ser/Ser） （40.4s; 95% CI 20.3-80.4s） （P = 0.03）. It is concluded that Cys23Ser 5-HT2c receptor gene polymorphism is associated with the IELT in men with LPE. Men with Cys/Cys genotype have shorter IELTs than men with Ser/Ser genotypes.

精神分裂症与5-HT2c受体基因的关系

目的 探讨上海地区汉族人 5 -HT2c受体基因Cys2 3Ser多态性的发生率及其与精神分裂症之间的关系。方法 随机抽取 2 74例精神分裂症患者作研究 ,以 187例正常人作对照。用多聚酶链式反应 (PCR)扩增及单链构像多态性(SSCP)分析、限制性片段长度多态性 (RFLPs)技术检测所研究对象的 5 -HT2c受体基因Cys2 3Ser多态性。结果 仅在 1个正常个体发现Cys -2 3 -Ser突变 ,精神分裂症患者中均未见 5 -HT2c受体基因Cys2 3Ser多态性。结论 上海地区汉族人 5 -HT2c受体基因Cys2 3Ser多态性发生率为 2 .17‰ ,5 -HT2c受体基因与精神分裂症的易感性无关。

少数民族人群hOGG1基因多态性与生活方式及DNA氧化损伤的关系

目的为评估hOGG1基因自然变异和基因-环境的交互作用,对中国5个民族人群的953个健康个体的hOGG1基因326位多态性分布进行了调查。方法用聚合酶链反应-限制性片段长度多态性（PCR-RFLP）方法分析hOGG1基因326位密码子多态性,用高效液相色谱-电化学检测（HPLC-ECD）方法分析尿中8-羟基-脱氧鸟嘌呤（8-OHdG）水平,生活方式相关因素（吸烟、饮酒、肉类和水果摄入）资料通过问卷调查获得。结果中国人群中hOGG1基因的等位基因频率分别为0.16（Ser/Ser）,0.49（Ser/Cys）和0.35（Cys/Cys）。5个民族人群中Ser326Cys多态性频率具有显著性差异（P=0.002）。除Ser326Cys与吸烟有关联外（P=0.027）,hOGG1基因多态性与其他的生活方式因素没有关系。Cys326Cys等位基因健康受试者尿中8-OHdG水平显著升高（P=0.033）。结论各民族人群hOGG1基因存在自然变异。吸烟与Cys/Cys多态性频率有关,hOGG1 Cys326Cys基因型个体DNA氧化性损伤的修复水平较低。