基因芯片筛选HepG2与HepG2.2.15细胞中的差异表达基因

目的 探讨HepG2细胞及HepG2.2.15细胞中差异表达的基因并对其基因表达谱进行生物学信息分析.方法 用Trizol一步法提取HepG2细胞及HepG2.2.15细胞的总RNA,并纯化mRNA,反转录合成荧光分子(Cy3/Cy5)标记的cDNA探针,与基因芯片杂交;采用LuxScan3.0图像分析软件对芯片图像进行分析,把图像信号转化为数字信号,最后以差异为2倍的标准来确定差异表达基因.结果 在54614个基因表达谱的筛选中,发现有4462个基因表达水平显著上调,2592个基因表达水平显著下调.结论 HBV基因组及其表达产物对于肝细胞基因表达谱有显著影响,可能参与了肝癌的发生发展.     

基因芯片筛选妊娠高血压综合征胎盘差异表达基因

目的了解妊高征患者胎盘与正常胎盘在分子水平的差异,为研究妊高征病因提供新的线索.方法以混合的4例正常胎盘总RNA为对照,用cy5dUTP和cy3dUTP分别标记对照cDNA和妊高征胎盘cDNA.用4000点cDNA表达谱芯片检查4例妊高征患者胎盘基因表达的改变.结果在4次芯片杂交过程中,分别有58-131条不等的基因发生差异表达,其中出现2次以上重复一致的异常表达基因共22条:表达增高的有13条,表达降低的有9条.结论应用cDNA表达谱芯片可快捷、高通量地筛选出妊高征胎盘可能的致病基因,为研究妊高征的病因提供新的思路和线索.     

激素耐药型与激素敏感型肾病综合征差异表达基因分析

分析;定量PCR验证芯片的基因差异表达结果.结果 与正常对照组相比较,与SRNS组和SSNS组相关的差异基因共157条;聚类分析显示SSNS组与对照组基因表达差异较小,SRNS组与前两者差异明显;功能分析发现与SRNS组相关的差异表达基因主要参与细胞核内生物学活动和细胞信号转导.结论 不同临床和病理类型原发性肾病综合征涉及多个不同的差异基因和生物学途径,其中HLA-DRB4和CLNS1A基因可能在不同类型原发性肾病综合征发病机制中发挥重要作用.     

应用基因芯片研究As2O3诱导K562细胞前后差异表达基因

目的研究三氧化二砷(As2O3)处理K562细胞前后,基因表达的变化。方法提取As2O3作用K562细胞前后的总RNA,逆转录成cDNA并用Cy3标记对照组,Cy5标记处理组,与自制的包含162个cDNA片段的K562芯片杂交。结果K562细胞经As2O3作用后,162个基因片段的表达都有所降低,其中25个基因片段的表达降低较为显著(Cy5/Cy3<0.5)。这些表达下调的基因片段包括转导因子、代谢酶、信号通路蛋白、激酶等,有6个差异表达基因与细胞的凋亡通路密切相关。As2O3可能通过抑制胰岛素样生长因子的功能,诱导细胞凋亡。结论应用自制的基因芯片筛选到了As2O3诱导K562细胞前后差异表达的基因,主要与细胞凋亡密切相关。     

基于小波变换-SAM方法的差异表达基因筛选研究

目的 基于微阵列表达数据,探索差异表达基因筛选的新的有效方法.方法 采用基于小波变换-SAM方法,通过调节△值,计算对应的假阳性率(FPR),从而筛选差异表达基因.结果 相对于小波变换前,基于小波变换-SAM方法 获得更好的筛选效果.结论 本方法适用于微阵列表达数据.获得更好的差异表达基因筛选效果,并且比传统的方法更具灵活性.     

基因芯片分析筛选BEL-7402与BEL-7402/FU细胞中的差异miRNA表达基因

目的:探讨2种肝癌细胞BEL-7402细胞及BEL-7402/FU细胞中差异表达的miRNA并对其基因表达谱进行生物学信息分析.方法:采用TRIzol一步法提取BEL-7402细胞及BEL-7402/FU细胞的总RNA,并纯化mRNA,反转录合成荧光分子Hy3标记的cDNA探针,与基因芯片杂交;采用Genepix Pro 6.0图像分析软件对芯片图像进行分析,把图像信号转化为数字信号,然后以差异为2倍的标准来确定差异表达基因.结果:在333个基因表达谱的筛选中,发现有2个基因表达水平显著上调,331个基因表达水平显著下调.结论:miR-122,miR-195等基因组对表达肝癌细胞耐药基因表达谱有显著的影响,可能参与肝癌耐药的发生、发展.     

基因芯片技术筛选主动脉瘤与正常主动脉差异表达基因

目的利用基因芯片技术研究人主动脉瘤组织与正常主动脉组织基因表达谱的差异。方法选取主动脉瘤病例标本5例,正常主动脉标本4例。提取总RNA,反转录成c DNA、体外转录合成aRNA后与芯片进行杂交,对结果进行分析。同时利用RT-qPCR对从表达谱筛选出的其中6个差异基因进行基因转录水平的定量验证。结果人主动脉瘤组与正常主动脉组相比,表达差异倍数大于2的基因共有270个,其中有211个基因上调表达,59个基因下调表达。差异表达的基因主要参与信号传导、免疫反应和炎性反应等生物学过程。RT-qPCR检测结果与基因芯片结果的符合率为100%。结论主动脉瘤与正常主动脉的表达谱有较大差异,利用基因芯片技术结合RT-qPCR验证可以筛选出主动脉瘤差异表达的基因,为研究主动脉瘤发病机制提供分子基础。     

重症肌无力患者免疫相关基因差异表达的基因芯片研究

目的:使用基因芯片技术研究重症肌无力(MG)患者外周血单个核细胞免疫相关基因的差异表达。方法:采用BIOSTAR Human-6-V3型人类全长基因cDNA表达谱芯片筛选30例初次发病MG患者差异表达的免疫相关基因,酶联免疫吸附法(ELISA)检测患者外周血IL-6、TNF-α的水平,对MG患者病情按许贤豪绝对评分法进行评分,并比较其临床意义。结果:158条差异表达免疫相关基因中,表达上调的基因76条(Ratio值2.0倍以上),表达下调的基因82条(Ratio值0.5倍以下),差异表达的免疫相关基因主要涉及细胞因子及其受体、趋化因子及其受体、细胞黏附分子、白细胞分化抗原、免疫转录调节分子、天然免疫分子等,细胞因子中IL-6、TNF-αmRNA表达水平显著上调,与MG患者血清IL-6、TNF-α水平检测结果一致,血清IL-6、TNF-α水平与MG临床绝对评分呈正相关。结论:人类全基因芯片技术可以快速、高通量筛选出MG患者差异表达的免疫相关基因,结果证实多个免疫基因参与了MG发病过程,为进一步阐明MG发病的免疫机制及治疗提供新的思路。     

心房颤动患者心房组织中差异表达miRNA的初步研究

目的：应用基因芯片技术研究心房颤动（房颤）患者心房组织中miRNA的表达谱,分析差异表达的miRNA,为进一步研究miRNA在房颤发生、发展中的作用奠定基础。方法：采用miRNA基因芯片技术检测房颤患者和非房颤患者心房组织样本中miRNA的表达水平;采用实时定量PcR（quantitativereal,timePCR,qRT．PCR）对部分差异表达的miRNA进行验证。结果：MiRNA基因芯片分析结果显示,与非房颤组织相比,房颤组织中差异表达的miRNA共有26个,其中16AmiRNA表达上调,10个miRNA表达下调。qRT．PCR验证结果与芯片结果相一致。结论：MiRNA在房颤患者心房组织中存在差异性表达。     

Bardet-Biedl syndrome: Antenatal presentation of forty-five fetuses with biallelic pathogenic variants in known Bardet-Biedl syndrome genes

Bardet-Biedl syndrome (BBS) is an emblematic ciliopathy associated with retinal dystrophy, obesity, postaxial polydactyly, learning disabilities, hypogonadism and renal dysfunction. Before birth, enlarged/cystic kidneys as well as polydactyly are the hallmark signs of BBS to consider in absence of familial history. However, these findings are not specific to BBS, raising the problem of differential diagnoses and prognosis. Molecular diagnosis during pregnancies remains a timely challenge for this heterogeneous disease (22 known genes). We report here the largest cohort of BBS fetuses to better characterize the antenatal presentation. Prenatal ultrasound (US) and/or autopsy data from 74 fetuses with putative BBS diagnosis were collected out of which molecular diagnosis was established in 51 cases, mainly in BBS genes (45 cases) following the classical gene distribution, but also in other ciliopathy genes (6 cases). Based on this, an updated diagnostic decision tree is proposed. No genotype/phenotype correlation could be established but postaxial polydactyly (82%) and renal cysts (78%) were the most prevalent symptoms. However, autopsy revealed polydactyly that was missed by prenatal US in 55% of the cases. Polydactyly must be carefully looked for in pregnancies with apparently isolated renal anomalies in fetuses.     

利用基因芯片筛查大肠癌肿瘤相关基因

目的探讨大肠癌肿瘤相关基因的差异表达。方法采用含有8064个人类靶基因的基因表达谱芯片筛选大肠癌组织同正常大肠黏膜的差异表达基因,并用逆转录聚合酶链反应（RT-PCR）技术对其中4条差异表达基因加以验证。结果大肠癌差异表达基因有1807条,发现上调表达的基因有936条,下调表达的基因有871条,其中癌基因及抑癌基因共57条。这57条基因中,36条基因表达上调．21条基因表达下调。结论大肠癌的发生发展与多个原癌基因及抑癌基因的差异表达有关。     

Genital abnormalities in females with Bardet-Biedl syndrome

The major manifestations of the Bardet-Biedl syndrome are digital anomalies, tapetoretinal degeneration, obesity, renal abnormalities, and hypogenitalism (described mainly in males). We report on 2 girls with Bardet-Biedl syndrome who also had vaginal atresia. A similar association in females with Bardet-Biedl syndrome was suggested in published reports of 11 affected individuals who had structural genital abnormalities, (some of which were missed in childhood), including persistent urogenital sinus, ectopic urethra, hypoplasia of the uterus, ovaries and fallopian tubes, uterus duplex, and septate vagina. The association of atresia of the vagina and other malformations of female genital structures in individuals with Bardet-Biedl syndrome has often been missed in childhood and should be looked for more systematically. © 1995 Wiley-Liss, Inc.     

慢性胃炎脾气虚证与脾胃湿热证的差异表达基因比较

目的：比较慢性胃炎脾气虚证与脾胃湿热证患者差异表达基因。方法:分别提取慢性胃炎脾气虚和脾胃湿热患者胃黏膜组织RNA各4例，逆转录荧光探针标记后杂交制作BiostarH-140 s基因芯片。采用荧光值ratio、生物信息学、t检验等方法分析结果，实时荧光定量PCR检测部分相关基因。结果:获得差异表达基因245条，主要为营养物质消化吸收运输、物质能量合成代谢、细胞周期增殖分化、免疫反应等相关基因；有显著意义的差异表达基因77条；实时定量PCR检测10条基因，6条与芯片结果一致。结论:慢性胃炎脾气虚和脾胃湿热2个证型基因表达存在明显差异，提示中医的临床辨证分型与基因差异表达有一定关系。     

Visual acuity and retinal function in patients with Bardet-Biedl syndrome

OBJECTIVE:

Bardet-Biedl syndrome is a genetic, multisystem disorder that causes severe visual impairment. This condition is characterized by retinal dystrophy, obesity, digit anomalies, renal disease, and hypogonadism. The purpose of this study was to analyze visual acuity and full-field electroretinogram findings in patients with the Bardet-Biedl syndrome phenotype.

METHODS:

The visual acuity of a group of 23 patients (15 males) with ages ranging from 6-36 years (mean = 15.8±6.4; median = 14.7) was assessed. Retinal function was evaluated by full-field electroretinography, and dark-adapted thresholds were assessed.

RESULTS:

Visual acuity in the better-seeing eye was 20/40 or better in 5 patients (21.7%), 20/50-20/150 in 13 (56.5%) patients, 20/200-20/400 in 2 (8.7%) patients and worse than 20/400 in one (4.3%) patient. The mean acuity in the better-seeing eye was 0.7±0.6 logMAR (20/100, Snellen equivalent). Scotopic rod and maximal responses were non-detectable in 21 (91.3%) patients, and cone responses were non-detectable in 15 (65.2%) patients. Elevated dark-adapted visual thresholds were observed in all 19 patients who were able to be assessed, with 10 (52.6%) patients having thresholds greater than 30 dB.

CONCLUSIONS:

In a relatively young cohort of patients with Bardet-Biedl syndrome, only 21% had 20/40 or better vision. ERG scotopic responses were absent in the majority of cases, with cone responses being observed in less than half of cases. These findings showed the early deleterious effects in retinal function and visual acuity caused by this condition.     

脑胶质瘤相关新基因表达的微阵列基因芯片分析

目的用基因芯片技术获取人脑胶质瘤组织和人正常脑组织中差异表达的相关基因，并对部分基因在不同级别胶质瘤中的表达进行初步研究。方法用含有218个与人类神经系统发育相关基因的表达谱芯片，提取正常脑组织及胶质瘤组织总RNA制备探针并杂交芯片，用ScanArray4000扫描芯片，对其中差异表达基因进行生物信息学分析，并用实时定量PCR方法验证smad1、Hmp19和TRIP3的mRNA在不同级别胶质瘤中的表达改变。结果与正常脑组织相比，胶质瘤中明显差异表达基因10个，包括细胞周期相关基因、转录和细胞转导相关基因、增殖和分化相关基因。其中表达下调基因5个，表达上调基因5个，经实时定量PCR验证smad1、Hmp19和TRIP3的表达结果与芯片检测结果相符，且随胶质瘤恶性级别的不同而变化。结论胶质瘤发生发展中存在多类基因表达的改变，表达谱基因芯片技术能快速有效地反映肿瘤发展过程中的基因改变，为胶质瘤的侵袭性和预后判断提供依据以及为导向治疗和基因治疗提供更多的靶基因。     

Cardiac abnormalities in the Bardet-Biedl syndrome: Echocardiographic studies of 22 patients

The Bardet-Biedl syndrome is an autosomal recessive disorder of polydactyly, obesity, tapetoretinal degeneration, mental retardation, hypogenitalism, and renal involvement. A high incidence of congenital and acquired heart disease was reported in the former “Laurence-Moon-Biedl-Bardet” syndrome. However, since the establishment of the Bardet-Biedl syndrome as a separate clinical entity, cardiac involvement has not been evaluated in this disorder. We have performed echocardiographic studies on 22 patients with the Bardet-Biedl syndrome from three extended, highly inbred Bedouin families. In addition to previously reported congenital heart defects we have observed hypertrophy of the interventricular septum and dilated cardiomyopathy. Our findings of cardiac involvement in 50% of the cases suggest that echocardiographic examination should be included in the clinical evaluation and follow-up of patients with Bardet-Biedl syndrome. © 1994 Wiley-Liss, Inc.