ABCB_1基因C3435T多态性与耐药性癫痫的关系

目的：探讨中国粤西地区汉族人群ABCB1基因C3435T（rs1045642）的单核苷酸多态性与耐药性癫痫的关系。方法：研究对象128例,包括正常对照组60例和癫痫组68例。根据患者对抗癫痫药物的反应性将癫痫组分为耐药组（30例）和药物敏感组（38例）。提取所有研究对象外周血基因组DNA,采用PCR扩增后基因测序鉴定ABCB1基因C3435T多态性。测定该位点基因型频率和等位基因频率,并进行统计学分析。结果：各组ABCB1基因C3435T基因型频率的分布符合Hardy-Weinburg平衡,提示其来自同一孟德尔群体。正常对照组与药物敏感组及耐药组,药物敏感组与耐药组间基因型频率比较,差异均无统计学意义（P〉0.05）。正常对照组与药物敏感组及耐药组,药物敏感组与耐药组间等位基因型频率比较,差异亦无统计学意义（P〉0.05）。结论：本研究结果初步证实ABCB1基因C3435T位点多态性分布与耐药性癫痫之间无相关性。     

癫痫患儿SCN1A、MDR1 G2677TA、ABCB1 C3435T基因多态性与左乙拉西坦治疗效果的关系及疗效的影响因素分析

摘要 目的：探讨癫痫患儿SCN1A、MDR1 G2677TA、ABCB1 C3435T基因多态性与左乙拉西坦（LEV）治疗效果的关系及疗效的影响因素。方法：选择2019年6月至2021年7月在本院接受LEV治疗的癫痫患儿226例为研究对象,分析所有患儿基因型和等位基因分布情况;治疗3个月后根据治疗效果分为有效组和无效组,分析两组患儿SCN1A、MDR1 G2677TA、ABCB1 C3435T基因型及等位基因频率分布;采用单因素及多因素Logistic回归分析法分析影响临床疗效的因素。结果：癫痫患儿SCN1A rs4667869、SCN1A rs10497275、MDR1 G2677TA、ABCB1 C3435T基因型及等位基因分布频率有统计学差异（P＜0.05）。有效组SCN1A rs4667869的基因型GG、GC及等位基因G分布频率高于无效组（P＜0.05）,基因型CC及等位基因C分布频率低于无效组（P＜0.05）;有效组SCN1A rs10497275的基因型GA及等位基因G高于无效组（P＜0.05）,基因型AA及等位基因A分布频率低于无效组（P＜0.05）;有效组MDR1 G2677TA的基因型GT、TT及等位基因T高于无效组（P＜0.05）,基因型GG、AA及等位基因G分布频率低于无效组（P＜0.05）;有效组ABCB1 C3435T的基因型CC、CT及等位基因C分布频率高于无效组（P＜0.05）,基因型TT及等位基因T分布频率低于无效组（P＜0.05）。单因素分析显示,月发作频率和出生窒息史与LEV治疗癫痫患儿疗效有关。多因素Logistic回归分析显示,SCN1A rs4667869、SCN1A rs10497275、MDR1 G2677TA和ABCB1 C3435T基因型及等位基因、出生窒息史是LEV治疗癫痫患儿疗效的影响因素。结论：癫痫患儿SCN1A、MDR1 G2677TA和ABCB1 C3435T基因多态性与LEV治疗效果有关,其多种基因型是LEV治疗效果的影响因素。     

多药耐药基因1 C3435T 多态性与癫痫耐药的关联性研究

目的:探讨我国癫痫患者P-糖蛋白基因多态性(C3435T)与抗癫痫药物反应性的关联性.方法:采用PCR-RFLP(聚合酶链反应-限制性片段长度多态性分析)的方法对156例癫痫患者外周血进行分型.其中,耐药组癫痫患者85例,有效组癫痫患者71例.结果:耐药组癫痫患者CC基因型21例,占24.70%;有效组癫痫患者CC基因型19例,占26.76%.两组比较无显著差异性.结论:本研究未发现P-gpC3435T基因型与癫痫耐药的关联性.     

多药耐药基因1C3435T多态性与癫痫耐药的关联性研究

目的：探讨我国癫痫患者P-糖蛋白基因多态性（C3435T）与抗癫痫药物反应性的关联性。方法：采用PCR--RFLP（聚合酶链反应--限制性片段长度多态性分析）的方法对156例癫痫患者外周血进行分型。其中,耐药组癫痫患者85例,有效组癫痫患者71例。结果：耐药组癫痫患者CC基因型21例,占24.70%;有效组癫痫患者CC基因型19例,占26.76%。两组比较无显著差异性。结论：本研究未发现P-gp C3435T基因型与癫痫耐药的关联性。     

多巴胺D1受体基因多态性与注意缺陷多动障碍的相关性研究

目的:探讨多巴胺D1受体(Dopamine D1 receptor, DRD1)基因启动子区G-48A、外显子区T1403C两个SNP位点与注意缺陷多动障碍(attention deficit hyperactivity disorder,ADHD)的关联性.方法:选取87名ADHD患者和103名正常对照,提取基因组DNA,采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术检测G-48A和T1403C两个多态性位点的基因型,SPSS13.0软件分析各位点的等位基因及基因型频率.结果:DRD1的G-48A基因型及等位基因频率分布在ADHD和对照组之间有统计学差异(p<0.05),ADHD组中等位基因A频率显著高于正常组(p<0.05).T1403C位点基因型及等位基因频率在ADHD组与健康对照组无统计学差异.结论:DRD1基因G-48A多态性可能与ADHD的发病有关,携带有等位基因A的个体可能更容易患ADHD.T1403C多态性与ADHD的发病无明显相关性.     

易感基因多态性与支气管哮喘的相关性研究

目的:探讨白介素-4(Interleukin-4,IL-4)基因589位点、白介素-4受体(interleukin-4 receptor,IL-4R)基因576位点多态性与内蒙古地区汉族支气管哮喘患者是否存在遗传易感性,是否与血清总IgE浓度相关.方法:采用聚合酶链式反应-限制性片段长度多态性(PCR-RFLP)方法检测内蒙古地区62例支气管哮喘患者和30例汉族正常人群IL-4基因的589位点、IL-4R基因的576位点多态性,进行基因型和基因频率分析,同时采用Elisa法检测患者血清总IgE浓度.结果:哮喘组IL-4基因启动子区-589(C/T)位点多态性分布频率与对照组比较,两组间基因型频率分析(X2=3.437,P=0.179),无显著性统计学差异(P＞0.05);两组基因频率分析(X2=9.405,P=0.002),有显著性差异(P＜0.05).哮喘组IL-4R基因启动子区-576(Q/R)位点多态性分布频率与对照组比较,两组间基因型频率分析(X2=0.815,P=0.665),无显著性统计学差异(P＞0.05),两组基因频率分析(X2=0.245,P=0.621),无显著性差异(P＞0.05).哮喘组血清总IgE浓度高于对照组,有显著性差异(t=6.367,P=0.00,P＜0.05).结论:内蒙古地区汉族人群哮喘组中,IL-4基因启动子区-589(C/T)位点多态性与支气管哮喘的发病无显著性差异;IL-4R基因-576(Q/R)位点多态性与支气管哮喘的发病无显著性差异;患者组血清总IgE显著高于对照组,但是与IL-4基因启动子区-589(C/T)位点多态性和IL-4R基因-576(Q/R)位点多态性没有相关性.     

醛糖还原酶基因启动区C(-106)T多态性与糖尿病视网膜病变相关性研究

目的:探讨醛糖还原酶(AR)基因启动区C(-106)T多态性与糖尿病视网膜病变(DR)的关系.方法:235例江苏汉族人群.其中2型糖尿病无视网膜病变组(NDR)63例,2型糖尿病伴视网膜病变组(DR)82例.正常对照组(NC)90例,用PCR-RFLP方法检测AR基因C(-106)T基因型.比较各组等位基因及基因型分布频率.结果:未发现NDR组和NC组之间AR基因C(-106)T各等位基因及基因型频率有显著差异(P分别为0.4505,0.7279);DR组中CT及TT基因型频率均高于NC组,CC基因型频率低于NC组(P=0.0239),DR组T等位基因频率显著高于NC组.C等位基因频率显著低于NC组(P=0.0038).结论:AR基因启动区C(-106)T多态性与江苏汉族人群DR相关,T等位基因可能是DR的遗传危险因子.     

多巴胺D4受体基因启动子区多态性与精神分裂症的相关性

目的:探讨多巴胺D4受体(Dopaminc D4 receptor,DRD4)基因启动子区的3个功能多态性与精神分裂症是否存在相关性.方法:严格按照诊断标准,选取无亲缘关系的精神分裂症患者220例,健康对照组200例提取基因组DNA,采用聚合酶链反应及等位基因特异性扩增技术检测DRD4基因启动子区-521C/T、-616C/G和-1240L/S 3个功能位点的基因型,采用HaploView4.0及SPSS11.5软件分析各位点基因型、等位基因频率及组间差异.结果:DRD4基因-1240L/S的基因型及等位基因频率分布在精神分裂症与正常对照组存在显著性差异(p<0.05).DRIM基因启动子区-521C/T和-616C/G位点的基因型及等位基因频率分布在精神分裂症组与正常对照组无统计学差异(p>0.05).结论:DRD4基因-1240L/S多态性与精神分裂症相关联,携带有-1240L/S多态性住点L等住基因的个体可能更容易患精神分裂症.     

血小板膜糖蛋白(GP)Ⅲa PLA、Ⅰa807C/T 基因多态性与阿司匹林 抵抗的相关性研究

目的:探讨青岛地区汉族人群阿司匹林抵抗与血小板膜糖蛋白GPⅢaPLA、Ⅰ a807C/T基因多态性之间的关系.方法:筛选150例动脉粥样硬化患者服用阿司匹林(100mg/d)至少14d以上,根据血小板聚集功能测定将其分为阿司匹林抵抗(AR)组、阿司匹林半抵抗(ASR)组,阿司匹林敏感(AS)组.用PCR-RFLP法确定各组GPⅢaPLA、GP Ⅰa 807C/T基因型.结果:仅于ASR组检出1例PLA1/A2基因型,其余均为PLA1/A1基因型,未发现PLA2/A2基因型,差异无统计学意义(P＞0.005);GP Ⅰ a807C/T基因位点AR组、ASR组的T等位基因频率均显著高于AS组,有统计学意义(P＜0.005).结论:GPⅢaPLA2基因可能不是阿司匹林抵抗的遗传危险因素.而GP Ⅰ a 807C/T基因位点的T等位基因与阿司匹林抵抗的发生相关联,可能是阿司匹林抵抗遗传易感因素.     

多巴胺D4受体基因启动子区多念性位点与注意缺陷多动障碍的关联研究

目的:探讨多巴胺D4受体基因启动子区-1240L/S,-616C/G和-521C/T三个多态性与注意缺陷多动障碍(Attention deficit hyperactivity disorder,ADHD)的关系.方法:取无亲缘关系的ADHD患者及对照组各166名,采用等位基因特异性扩增技术(allele specific amplification,ASA)及聚合酶链式反应琼脂糖凝胶电泳技术,检测ADHD患者和对照组基因型和等住基因的频率分布.结果:DRD4基因-521C/T的基因型及等位基因频率分布在ADHD组与正常对照组存在显著性差异(p＜0.05),ADHD组的T等位基因的频率显著高于正常对照组(x2=9.827,p=0.002,OR=1.639,95%CI=1.202-2.234).DRD4基因启动子区2个功能多态性位点-616C/G及-1240L/S的基因型及等位基因频率在正常组与ADHD组的分布无显著性差异(p＞0.05).结论:-521C/T位点与ADHD的易感性存在关联,且-521C/T等位基因是决定ADHD个体易感性的重要因素,含有T等位基因的个体罹患注意缺陷多动障碍的相对风险增高.     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.