中国北方汉族男子FECH基因-252A/G多态与耐力训练敏感性的关联研究

目的:探讨中国北方汉族男性亚铁螯合酶(FECH)基因-252A/G多态性与耐力训练敏感性的关联,寻找与有氧耐力训练效果的分子标记。方法:选取102名中国北方汉族男性健康受试者,以95%～105%个体无氧阈强度进行5 000米跑训练,每周3次,共18周,训练前后测定VO2max、RE等指标。使用PCR-RFLP和测序方法解析该基因多态性的分布特征,并进行该多态与上述生理指标进行关联性分析。结果:1)耐力训练前,AA基因型跑节省化时的心率(RE/HR)、跑节省化时的最大摄氧量(RE/rVO2)起始值均显著性低于GG基因型(P<0.01);2)有氧耐力训练后,AA基因型通气阈时的摄氧量(△VT/VO2)增加的幅度显著性高于GG基因型(P<0.05);AA基因型在跑节省化时的心率(△RE/HR)下降的幅度显著性高于GG基因型(P<0.05)。结论:在FECH基因-252A/G多态性中,AA基因型耐力训练具有较高的训练敏感性,可作为预测有氧耐力训练敏感性的分子标记。     

Emerging Bioinformatic Networks: Contesting the Public Meaning of Private and the Private Meaning of Public

This paper explores the complexity of public/private identities in the emerging global economies of gene sequence mapping and analysis. In so doing we seek to offer a less over-determined acccount of what it means to describe institutional actors as either 'public' or 'private'. Instead, these 'codes' can be seen to offer actors a means of mutual positioning that, more usually conceals broader interdependencies within the world's bioinformatics networks.     

Association of Estrogen Receptor-α Gene &; Metallothionein-1 Gene Polymorphisms in Type 2 Diabetic Women of Andhra Pradesh

Type 2 diabetes mellitus (DM) is a multifactorial disease where both genetic and environmental factors contribute to its pathogenesis. Estrogen plays an important role in type 2 DM pathogenesis. A number of polymorphisms have been reported in the estrogen receptor (ESR1), including the XbaI and PvuII restriction enzyme polymorphisms of ESR1,which may be involved in disease pathogenesis. Metallothioneins (MT) act as potent antioxidants against various oxidative damages. Very few studies have indicated the association between Estrogen Receptor-α, MT1 gene polymorphisms with type2 DM. A total of 100 type 2 diabetic women and 100 age, sex matched controls were recruited. Using the PCR based RFLP method, the PvuII and XbaI polymorphisms of ESR1 and in MT1A (rs8052394 and rs11076161) gene polymorphisms were analysed. The genotype distribution and frequency of mutated allele showed no significant differences between diabetic and non-diabetic groups in PvuII (χ2 = 2.443; P = 0.1181) or XbaI (χ2 = 1.789; P = 0.1812) and rs8052394 (χ2 = 1.154; P = 0.2840) or rs11076161 (χ2 = 0.4141; P = 0.5199), polymorphisms. This is the first Indian study to conclude that ESR1 and MT1 gene polymorphisms are not associated with increased susceptibility to type 2 diabetes in Indian women.     

运动训练促进学习记忆相关机制的研究述评

本文通过对可能与学习记忆相关脑区突触形态与功能、中枢神经递质系统以及基因表达等3个方面的简要综述研究,对运动影响学习与记忆能力的机制将有更为精确与全面的认识,从而进一步推动相关研究的不断深入。     

Effect of enalapril on plasma homocysteine levels in patients with essential hypertension

Objective:To investigate the effect of enalapril on plasma homocysteine(Hcy) levels and the association of methylenetetrahydrofolate reductase(MTHFR) C677T polymorphism with the changes of Hcy levels in response to enalapril among patients with essential hypertension.Methods:A total of 130 patients with mild-to-moderate essential hypertension were enrolled and enalapril was orally administered at a dose of 10 mg/d for eight weeks.Plasma Hcy levels were measured by denaturing high-performance liquid chromatography(DHPLC) at baseline and after eight weeks of treatment.Genotyping of MTHFR C677T polymorphism was performed by TaqMan probe technique.Results:Compared with baseline,plasma Hcy levels did not change significantly after eight weeks(P=0.81).Stratified by baseline Hcy levels,a significant increase in plasma Hcy levels(P=0.02) among those with Hcy 10 μmol/L was observed,in contrast to no significant changes in plasma Hcy levels(P=0.54) among those with Hcy ≥10 μmol/L.No significant association was observed between MTHFR C677T polymorphism and changes in Hcy levels in response to enalapril.Conclusions:Enalapril may cause an increase in plasma Hcy levels among the hypertensives with low baseline Hcy levels.There was no significant association between MTHFR C677T genotypes and changes in Hcy levels in response to enalapril among subjects with essential hypertension.     

儿童单纯性肥胖与纤维蛋白原基因遗传多态性的关联研究

以TaqI限制性内切酶测定Fg基因的多态性与儿童单纯性肥胖进行关联研究，发现基因型的分布在单纯性肥胖组和正常体重组有显著差异(基因型分布P=0．029；等位基因频率p=0．005)。携带突变等住基因的儿童易于肥胖。从而推测Fg基因可能是儿童单纯性肥胖的基因标记。研究结果提示：通过测定基因基础不仅可以预测单纯性肥胖的倾向。而且可以为建立预防和干预肥胖的模型提供理论依据。     

血管紧张素转化酶基因I/D多态性与高血压脑梗塞发病的相关性

采用PCR方法分别检测82例高血压合并脑梗塞患者(BI)、67例单纯高血压患者(EH)和95例健康对照者(C)的血管紧张素转化酶(ACE)基因I/D多态性类型,并分析ACE基因I/D多态性分布与高血压合并脑梗塞发病的相关性.结果显示,BI组ACE基因的D/D基因型频率和D等位基因频率(分别为0.341和0.524)显著高于C组(分别为0.200和0.374,P<0.05)和EH组(分别为0.179和0.358,P<0.05),而EH组和C组ACE基因的D/D基因型频率和D等位基因频率无显著性差异.该研究结果表明,ACE基因的D/D基因型可能是高血压合并脑梗塞发病的独立危险因素.     

运动对心脑血管系统内皮素及降钙素基因相关肽的影响

运动对心脑血管生长的影响在临床中已获得资料。本文回顾了对血管的收缩和舒张有重要作用的内皮素和降钙素基因相关肽分子生物学方面的研究，认为两者的生物学活性对运动心脏的形成和心脏康复有重要的调节作用，，深入对它们的研究将使我们从分子生物学水平加深运动心脏与运动疗法和心脏康复在机理方面的认识。