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长链非编码RNA（IncRNAs）是真核细胞中转录本长度超过200nt的非编码RNA。近年来的研究表明lncRNAs具有一系列的重要功能,包括影响转录、RNA剪切、翻译、核因子转运、基因重排及染色质修饰等,lncRNAs的异常表达常与肿瘤、神经退行性疾病、心血管系统疾病等的发生发展密切相关,因此对lncRNAs的研究将有助于对机体生理病理反应的内在机制形成更为系统的认识。该文就lncRNAs的研究策略及其在神经退行性疾病中的研究进展进行了综述,以期为神经系统调控网络的建立及神经退行性疾病的防治提供新的思路。 相似文献
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The focus of this Research Experience for Undergraduates (REU) project was on RNA secondary structure prediction by using a lattice walk approach. The lattice walk approach is a combinatorial and computational biology method used to enumerate possible secondary structures and predict RNA secondary structure from RNA sequences. The method uses discrete mathematical techniques and identifies specified base pairs as parameters. The goal of the REU was to introduce upper-level undergraduate students to the principles and challenges of interdisciplinary research in molecular biology and discrete mathematics. At the beginning of the project, students from the biology and mathematics departments of a mid-sized university received instruction on the role of secondary structure in the function of eukaryotic RNAs and RNA viruses, RNA related to combinatorics, and the National Center for Biotechnology Information resources. The student research projects focused on RNA secondary structure prediction on a regulatory region of the yellow fever virus RNA genome and on an untranslated region of an mRNA of a gene associated with the neurological disorder epilepsy. At the end of the project, the REU students gave poster and oral presentations, and they submitted written final project reports to the program director. The outcome of the REU was that the students gained transferable knowledge and skills in bioinformatics and an awareness of the applications of discrete mathematics to biological research problems. 相似文献
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核糖体是细胞生长所需的蛋白质合成的动力工厂,每一个核糖体的大小为4兆而顿,有18S、5.8S、28S和5S四种RNA及80S等蛋白质组成,细胞中约有50%的RNA是核糖体RNA,这些RNA直接或间接地参与形成数百万的核糖体,因此,核糖体RNA基因的转录调控机制一直是细胞生长和细胞周期调控研究的热点,细胞通过进化已经形成一套完整的配合RNA聚合酶共同完成的核糖体RNA转录调控机制。本文从核糖体RNA基因结构出发,就染色质重塑、组蛋白乙酰化及细胞周期三个方面探讨核糖体RNA转录调控机制。 相似文献
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核糖体是细胞生长所需的蛋白质合成的动力工厂,每一个核糖体的大小为4兆而顿,有18S、5．8S、28S和5S四种RNA及80S等蛋白质组成,细胞中约有50％的RNA是核糖体RNA,这些RNA直接或间接地参与形成数百万的核糖体,因此,核糖体RNA基因的转录调控机制一直是细胞生长和细胞周期调控研究的热点,细胞通过进化已经形成一套完整的配合RNA聚合酶共同完成的核糖体RNA转录调控机制。本文从核糖体RNA基因结构出发,就染色质重塑、组蛋白乙酰化及细胞周期三个方面探讨核糖体RNA转录调控机制。 相似文献
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文章采用改良的异硫氰酸胍法提取南方红豆杉枝叶总RNA,通过甲醛变性凝胶电泳,可见3条比较明显的rRNA条带,其中28SRNA条带的亮度大约为18SRNA的2倍,说明总RNA样品的完整性良好。紫外吸收值测定,A260/A280比值介于1.7到2.0之间,A260/A230比值大于2.0,得到较为典型的RNA吸收值,说明酚类、蛋白质和无机盐等杂质已排除。此方法简便易行,能得到纯度高、质量好的RNA。 相似文献
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通过探讨强、弱势粒结实率和充实度与mRNA/总RNA的关系,分析水稻强势粒和弱势粒结实率和充实度差异的机理,旨在提高水稻结实率和充实度.结果发现：弱势粒中总RNA含量和单粒含量与强势粒差异不大,mRNA、蛋白质含量和单粒含量以及mRNA与总RNA之比低于强势粒.mRNA/总RNA与强弱势粒结实率和充实度一致,mRNA/总RNA低是弱势粒结实率和充实度低的原因.因为mRNA/总RNA排除了籽粒灌浆的稀释作用,反映了水稻籽粒灌浆过程中基因转录活性的高低,与籽粒灌浆趋势一致,所以将其作为库活性的指标是适宜的. 相似文献
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用成年雄性Wistar大鼠,经4％多聚甲醛灌注固定,取下丘脑组织,行再固定24h,常规石蜡包埋和切片,用地高辛标记的cRNA探针进行原位杂交,结果显示在弓状核及其邻近区域见到阳性神经元,阳性信号为蓝色颗粒,胞质、核膜及核仁呈阳性。阴性对照均无阳性反应出现。本实验证实,用石蜡切片进行原位杂交组织化学研究,能检测下丘脑生长抑素神经元基因表达产物mRNA,方法稳定,重复性好,便于普通实验室开展工作。 相似文献
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用成年雄性Wistar大鼠,经4％多聚甲醛灌注固定,取下丘脑组织,行再固定24h,常规石蜡包埋和切片,用地高辛标记的cRNA探针进行厚位杂交,结果显示在弓状核及其邻近区域见到阳性神经元,阳性信号为蓝色颗粒,胞质、核膜及核仁呈阳性 阴性对照均无阳性反应出现 本实验证实,用石蜡切片进行原位杂交组织化学研究,能检测下丘脑生长抑素神经元基因表达产物mRNA,方法稳定,重复性好,便于普通实验室开展工作。 相似文献
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Type-dependent differential expression of neuropeptide Y in chicken hypothalamus （Gallus domesticus）
Chen GQ Hu XF Sugahara K Chen JS Song XM Zheng HC Jiang YQ Huang X Jiang JF Zhou WD 《Journal of Zhejiang University. Science. B》2007,8(11):839-844
Neuropeptide Y (NPY) is one of the most important orexigenic agents in central regulation of feeding behavior, body weight and energy homeostasis in domestic chickens. To examine differences in the hypothalamic NPY between layer-type and meat-type of chickens, which are two divergent kinds of the domestic chickens in feeding behavior and body weight, we detected mRNA levels of NPY in hypothalamic infundibular nucleus (IN), paraventricular nucleus (PVN) and lateral hypothalamic area (LHA) of these two types of chickens using one-step real time RT-PCR. The meat-type chicken had more food daily (about 1.7 folds) and greater body weights (about 1.5 folds) and brain weights than the layer-type chicken at the age of 14 d. In the meat-type of chicken, NPY mRNA levels of the IN and PVN were significantly greater than those of the LHA, and were not significantly different between the IN and PVN. However, in the layer-type of chicken, NPY mRNA levels were significantly greater in the IN than those in the LHA and PVN, and were not significantly different between the PVN and LHA. In all these hypothalamic regions, the layer-type of chicken had significantly higher NPY mRNA levels than the meat-type chicken did. These results suggest the expression of NPY in the hypothalamus has a type-dependent pattern in domestic chickens. 相似文献
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An Inexpensive Gel Electrophoresis-Based Polymerase Chain Reaction Method for Quantifying mRNA Levels 
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下载免费PDF全文 William D. Bradford Laty Cahoon Sara R. Freel Laura L. Mays Hoopes Todd T. Eckdahl 《CBE life sciences education》2005,4(2):157-168
In order to engage their students in a core methodology of the new genomics era, an ever-increasing number of faculty at primarily undergraduate institutions are gaining access to microarray technology. Their students are conducting successful microarray experiments designed to address a variety of interesting questions. A next step in these teaching and research laboratory projects is often validation of the microarray data for individual selected genes. In the research community, this usually involves the use of real-time polymerase chain reaction (PCR), a technology that requires instrumentation and reagents that are prohibitively expensive for most undergraduate institutions. The results of a survey of faculty teaching undergraduates in classroom and research settings indicate a clear need for an alternative approach. We sought to develop an inexpensive and student-friendly gel electrophoresis-based PCR method for quantifying messenger RNA (mRNA) levels using undergraduate researchers as models for students in teaching and research laboratories. We compared the results for three selected genes measured by microarray analysis, real-time PCR, and the gel electrophoresis-based method. The data support the use of the gel electrophoresis-based method as an inexpensive, convenient, yet reliable alternative for quantifying mRNA levels in undergraduate laboratories. 相似文献
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以β-actin为内参基因,通过荧光PCR方法,分析了翻译调控肿瘤蛋白（TCTP）基因在南美白对虾不同组织中的表达情况,结果表明,TCTP基因在对虾的各种组织中均有表达,但在肌肉中表达量最高,而心脏中的表达最低． 相似文献
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目的:检测CD44v6mRNA和HSP70mRNA在胃癌组织中的表达,探讨CD44v6mRNA和HSP70mRNA在胃癌发生发展中的作用.方法:利用核酸原位杂交技术对39例胃癌组织进行检测.结果:CD44v6mRNA和HSP70mRNA在胃癌组织表达的阳性率都为61.54%(24/39),CD44v6mRNA和HSP70mRNA在高分化管状腺癌与低分化管状腺癌中的表达都有显著性差异(P＜0.05),但HSP70mRNA在胃癌组织的表达与性别、年龄、浸润深度及淋巴结有无转移都无关(P＞0.05),而CD44v6mRNA与淋巴结有无转移有关(P＜0.05).结论:CD44v6mRNA和HSP70mRNA在胃癌组织都有较高的表达,两者均可作为评估胃癌预后的指标. 相似文献
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郴州市旅游资源分类及评价 总被引：3，自引：0，他引：3
郴州市有着丰富的旅游资源和良好的社会经济环境,在新拟定的"中国旅游资源分类系统与类型评价"基础上,对郴州市旅游资源进行系统的分类和简要的评价,可知其重要性(品位)发生了一定变化。 相似文献