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Qiagen Minelute Gel Extraction Kit

Company: QIAGEN
Catalog#: 28604
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Multiplex T-cell Stimulation Assay Utilizing a T-cell Activation Reporter-based Detection System
Author:
Date:
2021-01-20
[Abstract]  

Immune tolerance and response are both largely driven by the interactions between the major histocompatibility complex (MHC) expressed by antigen presenting cells (APCs), T-cell receptors (TCRs) on T-cells, and their cognate antigens. Disordered interactions cause the pathogenesis of autoimmune diseases such as type 1 diabetes. Therefore, the identification of antigenic epitopes of autoreactive T-cells leads to important advances in therapeutics and biomarkers. Next-generation sequencing methods allow for the rapid identification of thousands of TCR clonotypes from single T-cells, and thus there is a need to determine cognate antigens for identified TCRs. This protocol describes a reporter system of T-cell activation where the fluorescent reporter protein ZsGreen-1 is driven by nuclear

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[摘要]  [摘要] 免疫耐受和应答都很大程度上由抗原呈递细胞(APC)表达的主要组织相容性复合物(MHC),T细胞上的T细胞受体(TCR)及其同源抗原之间的相互作用驱动。相互作用障碍导致自身免疫性疾病(例如1型糖尿病)的发病机理。因此,鉴定自身反应性T细胞的抗原表位导致治疗和生物标志物的重要进展。下一代测序方法可从单个T细胞快速鉴定数千种TCR克隆型,因此需要确定已鉴定TCR的同源抗原。该协议描述了T细胞活化的报告系统,其中荧光报告蛋白ZsGreen-1由活化T细胞的核因子(NFAT)信号驱动并通过流式细胞仪读取。记者T细胞也组成性表达额外的一对荧光素tein作为识别物,允许同时多路复用多达8种不同的报告T细胞系,每种表达不同的目标TCR,可通过流式细胞仪区分。一旦制成TCR表达细胞系,仅需一个转导步骤即可将其无限期用于制备新的T细胞系。这种多路复用系统允许筛选TCR-抗原相互作用的数量,否则这些相互作用将是不切实际的,可在多种情况下使用(即,筛选单个抗原或抗原库),并可用于研究任何T细胞-MHC-抗原三分子相互作用。

[背景] T细胞,抗原呈递细胞(APC)及其同源抗原之间的相互作用是自身免疫性疾病(例如1型糖尿病)的主要事件(Michels等,2017; ...

A Small RNA Isolation and Sequencing Protocol and Its Application to Assay CRISPR RNA Biogenesis in Bacteria
Author:
Date:
2018-02-20
[Abstract]  Next generation high-throughput sequencing has enabled sensitive and unambiguous analysis of RNA populations in cells. Here, we describe a method for isolation and strand-specific sequencing of small RNA pools from bacteria that can be multiplexed to accommodate multiple biological samples in a single experiment. Small RNAs are isolated by polyacrylamide gel electrophoresis and treated with T4 polynucleotide kinase. This allows for 3’ adapter ligation to CRISPR RNAs, which don’t have pre-existing 3’-OH ends. Pre-adenylated adapters are then ligated using T4 RNA ligase 1 in the absence of ATP and with a high concentration of polyethylene glycol (PEG). The 3’ capture step enables precise determination of the 3’ ends of diverse RNA molecules. Additionally, a random hexamer in the ligated ... [摘要]  新一代高通量测序技术能够对细胞中的RNA群体进行敏感和明确的分析。在这里,我们描述了一种从细菌中分离和链特异性测序小RNA池的方法,所述细菌可以在单个实验中多路复用以容纳多个生物样品。小RNA通过聚丙烯酰胺凝胶电泳分离并用T4多核苷酸激酶处理。这允许3'衔接头连接至CRISPR RNA,其不具有预先存在的3'-OH末端。然后使用T4 RNA连接酶1在不存在ATP和高浓度聚乙二醇(PEG)的情况下将前腺苷酸化的衔接子连接。 3'捕获步骤能够精确测定不同RNA分子的3'末端。此外,连接适配器中的随机六聚体有助于控制潜在的下游扩增偏差。逆转录后,将cDNA产物环化并通过PCR制备文库。我们显示扩增的文库不需要通过凝胶电泳可见,以期望产物的有效测序。使用这种方法,我们通常从少量纯化的小RNA制备RNA测序文库。该协议适合于通过对成熟的CRISPR RNA进行测序来测定细菌中的CRISPR RNA生物合成,但可以用于测序不同类型的小RNA。我们还提供了一个完整的数据处理管道示例,并提供了运行所提供脚本的说明。


【背景】与聚集的经常散布的短回文重复序列(CRISPR)相关的遗传模块赋予不同的原核宿主适应性免疫(Barrangou et ...

Drosophila Fecal Sampling
Author:
Date:
2017-09-20
[Abstract]  Fecal sampling is a non-invasive method which raises the possibility to study the development and the changes in the microbial community throughout different time points of a fly population or throughout different treatments. This method allows precise manipulation to trigger the fly’s physiology by nutritional interventions, bacterial infections or other stressors.

As in most other animals, the intestinal microbiota is essential for a healthy fly-life. Because Drosophila only harbors a relative simple bacterial community with a small variety of round about 8 to 10 different species, it is rather easy to build up the microbial community and to investigate microbial changes after treatment.

Another positive effect using the fly’s feces is that bacteria that ...
[摘要]  粪便取样是一种非侵入性方法,提高了在飞行群体的不同时间点或整个不同处理过程中研究微生物群落的发展和变化的可能性。这种方法允许精确的操纵通过营养干预,细菌感染或其他压力源触发苍蝇的生理学。
  与大多数其他动物一样,肠道微生物群对健康的飞行生命至关重要。因为果蝇只拥有一个相对简单的细菌群落,有大约8到10个不同种类的小种,很容易建立微生物群落,并在处理后调查微生物的变化。
  使用蝇的粪便的另一个积极作用是不是肠微生物群的一部分的细菌,例如Wolbachia,可以直接从分析中排除,因为它们不会排泄。
  使用这种方法,生成的数据集可能反映了在简单飞行模型中研究微生物组织相关疾病的一个很好的范例,此外,可以以高通量方法测试药物。

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