The association between dopamine D4 receptor exon III polymorphism and intensity of PTSD symptoms among flood survivors

Abstract

Thanks to the development of molecular genetics methods it is now possible to look for the genes which may contribute to posttraumatic stress disorder (PTSD). Polymorphism located in exon III of dopamine receptor type 4 (DRD4) gene was related to maladaptive stress responses as well as temperament traits related to PTSD. This study analyzed the association between the variable number tandem repeat (VNTR) DRD4 exon III polymorphism and intensity of PTSD symptoms in 107 (57 women and 50 men) survivors of a flood aged 14–62. Intensity of PTSD symptoms was measured using PTSD-F and PTSD-C questionnaires. Multivariate analysis of covariance (MANCOVA) was conducted to test the main and interactive effects of genotype and level of trauma exposure. Participants with at least one copy of the DRD4 long allele (seven or eight repetitions) had more intense PTSD symptoms on the Avoidance/Numbing scale (Cohen's f = .22) and the Total Scale (Cohen's f = .2) of the PTSD-F than participants who did not have these alleles in genotype. The results must be treated with caution, however, due to methodological restrictions and they need to be replicated on a larger sample.     

The association of environmental,individual factors,and dopamine pathway gene variation with smoking cessation

This study aimed to examine whether dopamine (DA) pathway gene variation were associated with smoking cessation, and compare the relative importance of infulence factors on smoking cessation. Participants were recruited from 17 villages of Shandong Province, China. Twenty-five single nucleotide polymorphisms in 8 DA pathway genes were genotyped. Weighted gene score of each gene was used to analyze the whole gene effect. Logistic regression was used to calculate odds ratios (OR) of the total gene score for smoking cessation. Dominance analysis was employed to compare the relative importance of individual, heaviness of smoking, psychological and genetic factors on smoking cessation. 415 successful spontaneous smoking quitters served as the cases, and 404 unsuccessful quitters served as the controls. A significant negative association of total DA pathway gene score and smoking cessation was observed (p < 0.001, OR: 0.25, 95% CI 0.16–0.38). Dominance analysis showed that the most important predictor for smoking cessation was heaviness of smoking score (42%), following by individual (40%), genetic (10%) and psychological score (8%). In conclusion, although the DA pathway gene variation was significantly associated with successful smoking cessation, heaviness of smoking and individual factors had bigger effect than genetic factors on smoking cessation.     

MAOA基因rs6323多态性与同伴关系对男青少年早期抑郁的影响

以683名男青少年为被试(初次测评时M = 13.35岁; SD = 0.51), 综合运用传统回归分析和新兴显著性区域检验, 考察了MAOA基因rs6323多态性与同伴关系对青少年早期抑郁的交互作用及其表现形式。结果表明：当同伴接纳水平较低时, G等位基因携带者的抑郁水平表现出高于T等位基因携带者的趋势, 当同伴接纳水平较高时, G型基因携带者的抑郁水平显著低于T等位基因携带者; 同伴接纳可以显著预测G等位基因携带者的抑郁, 但对T等位基因携带者的抑郁无显著预测作用; rs6323多态性与同伴拒绝的交互作用亦不显著。研究结果提示, 同伴关系对MAOA基因与男青少年早期抑郁的关联起调节作用, 且其作用形式部分支持不同易感性模型观点。     

大肠癌常见诊疗误区解析

大肠癌是最常见的恶性肿瘤之一。尽管近年诊疗水平不断提高,但在临床诊疗工作中,仍存在一些误区。本文主要针对肠镜检查的必要性、肝转移是否能手术治疗、术后辅助化疗的适应证、靶向药物的适应证以及K-RAS基因检测的必要性等5方面进行分析。逐步规范大肠癌的诊断和治疗,提高大肠癌综合治疗水平。     

COMT基因rs6267多态性与青少年攻击行为的关系:性别与负性生活事件的调节作用

运用问卷法与DNA分型技术, 以153名高和低攻击组初中生为被试, 考察COMT基因rs6267多态性与攻击行为的关系, 重点探讨性别与负性生活事件的调节作用。结果表明：rs6267多态性与男青少年攻击行为的发生显著关联, T等位基因显著降低了男青少年攻击行为发生的概率, 但该位点与女青少年的攻击行为无关; rs6267多态性与负性生活事件存在交互作用的趋势, 在那些经历高水平负性生活事件的青少年中, GG型基因携带者发生攻击行为的概率高于T等位基因携带者。     

个体化用药--医药治疗的革命

遗传药理学和药物基因组学的发展,促进了药物反应种族差异的发现及其机制的阐明,使药物治疗模式开始由过去的诊断导向治疗向根据个体的遗传机构实行基因导向性治疗的新模式转换.     

“莱昂假说”与克隆性分析技术的思想启迪

克隆性分析技术已经很大程度上影响和改变着人们对肿瘤的思维。“莱昂假说”的创立、印证以及克隆性分析技术的发展、应用,已经使我们重新认识了许多肿瘤和肿瘤前期病变的性质。其间的研究工作启示我们,科学需要源于事实基础的大胆猜测,更需要有求异性思维,敢于突破、善于联想根源于深厚的知识沉淀。     

Intergenerational transmission of literacy skills among Filipino families

We examined the joint role of parental word reading skills and conventional home literacy environment measures among 320 Filipino low‐ to middle‐income families in Cebu City, Philippines with children aged 5–8 years old. A ranking of parent‐reported ratings of their frequency of engaging in home literacy activities and adult literacy practices revealed that book‐related behaviors were less frequently practiced relative to other behaviors, and mean ratings on the home literacy resources scale suggested a relatively print‐poor environment. Nevertheless, scale items about book reading and direct literacy instruction at home correlated with child's language and literacy skills. Structural equation modeling showed that parent's education and frequency of engaging in home literacy activities uniquely accounted for variance in child's oral language and print knowledge skills. In a second model, parent's word reading skills were significantly related to child's skills, but did not eliminate or attenuate influences from parent's education and home literacy activities. Results are important in relation to theories on the intergenerational transmission of literacy skills and the generalizability of findings from developed countries to developing country contexts.     

COMT基因Val158Met多态性与抑郁的关系

抑郁的发生具有重要的遗传学基础。COMT基因Val158Met多态性是抑郁的重要候选基因位点。目前有关COMT基因Val158Met多态性与抑郁关系的研究主要采用单基因设计、单基因-环境设计以及多基因-环境设计。有资料显示负性情绪偏向及其相关脑区可能在COMT基因Val158Met多态性与抑郁间起中介作用, 但具体机制仍有待探究。未来研究可以进一步考察被试的种族、年龄和性别等因素对COMT基因Val158Met多态性与抑郁关系的调节作用, 并通过采用多基因-环境设计, 综合运用积极与消极环境指标等措施深入考察负性情绪偏向和相关脑区在COMT基因Val158Met多态性与抑郁间的作用及其机制。     

美托洛尔常规治疗与基因导向治疗高血压病的比较

比较基因导向美托洛尔个体化治疗与常规治疗高血压病的临床疗效、安全性和经济性。从300例1或2级原发性高血压患者中随机抽取165例进入常规治疗组（A组,n＝165）,其余135例患者进行CYP2D6基因、β1肾上腺素能受体（β1-AR）基因多态性检测,将β1-AR基因389位携带了Arg等位基因的原发性高血压患者133例分入基因导向治疗组（B组,n＝133）;基因导向治疗组患者按照CYP2D6基因分型分为弱代谢组（PMB,n=43）、中等代谢组（IMB,n=54）和强代谢组（EMB,n=36）。常规治疗组给予美托洛尔100mg/日,基因导向治疗组中PMB组、IMB组、EMB组分别给予美托洛尔25 mg/d、100mg/d、200mg/d,均分2次口服降压治疗,共随访8周,观察血压和不良反应等指标。应用成本-效果分析方法对基因导向型个体化治疗方案进行药物经济学评估。结果为基因导向治疗组降压总有效率明显高于常规治疗组（65.08% vs 47.4%, P＜0.05）;基因导向治疗组的不良反应发生率明显低于常规治疗组（P＜0.05）。成本效果分析,基因导向治疗组的平均成本效果比稍高于常规治疗组（350.05 vs 249.96）,与常规治疗组相比增量成本效果比（ICERs）为618.38。依据基因导向的前瞻性美托洛尔个体化降压治疗较传统给药模式更为安全、有效,但短期治疗难以体现其更优的经济学价值。