| Using RNA Sequencing and Spike-in RNAs to Measure Intracellular Abundance of lncRNAs and mRNAs
|
|
Author:
Date:
2020-10-05
[Abstract] Long noncoding RNAs (lncRNAs) play essential roles in normal physiology and in disease but their mechanisms of action can be challenging to identify. For mechanistic studies, it is often useful to know a lncRNA’s intracellular abundance, i.e., approximately how many molecules of the lncRNA are present in a typical cell of a cell-type of interest. At least two approaches have been used to approximate lncRNA intracellular abundance: single-molecule sensitivity RNA fluorescence in situ hybridization (smFISH) and single-gene, calibrated reverse-transcription followed by quantitative PCR (RT-qPCR). However, like all experimental approaches, these methods have their limitations. smFISH, when analyzed using diffraction-limited microscopy, can underestimate intracellular ...
[摘要] [摘要]长非编码RNA（lncRNA）在正常生理和疾病中起着至关重要的作用，但其作用机理可能难以鉴定。对于机理研究，了解lncRNA的胞内丰度（即在目标细胞类型的典型细胞中大约存在多少个lncRNA分子）通常很有用。至少两种方法已用于估算lncRNA细胞内丰度：单分子敏感性RNA荧光原位杂交（smFISH ...
|
|
|
| Terminal Deoxynucleotidyl Transferase Mediated Production of Labeled Probes for Single-molecule FISH or RNA Capture
|
|
Author:
Date:
2018-03-05
[Abstract] Arrays of short, singly-labeled ssDNA oligonucleotides enable in situ hybridization with single molecule sensitivity and efficient transcript specific RNA capture. Here, we describe a simple, enzymatic protocol that can be carried out using basic laboratory equipment to convert arrays of PCR oligos into smFISH and RAP probesets in a quantitative, cost-efficient and flexible way.
[摘要] 短的，单标记的ssDNA寡核苷酸阵列使得能够与单分子灵敏度和有效的转录物特异性RNA捕获进行原位杂交。 在这里，我们描述了一个简单的酶促协议，可以使用基本的实验室设备将PCR寡核苷酸阵列以定量，成本高效和灵活的方式转换为smFISH和RAP探针组。
【背景】合成来源的多个单标记的短寡核苷酸的使用极大地改进了对特异性转录物的高特异性和单分子灵敏度的检测（Femino等人，1998; Raj等人。，2008）。这种探针分子与经典使用的长核酸探针相比具有改进的穿透性并且需要更温和的杂交条件，从而更好地保存标本的结构（例如，Little等人 >，2015，Gaspar 等，2017a）。由于在该设计中多个寡核苷酸 - 通常24-96-靶向相同转录物的不同部分，因此在非特异性背景上在特异性靶分子上发生信号累积，这与由长的多标记探针产生的相等信号相反（Raj ，2008）。此外，由于单个短探针的标记是定量的 - 与长探针的随机标记相反 - ...
|
|
|
| ACE-score-based Analysis of Temporal miRNA Targetomes During Human Cytomegalovirus Infection Using AGO-CLIP-seq
|
|
Author:
Date:
2016-04-20
[Abstract] Although temporal regulation of gene expression during the course of infection is known to be critical for determining the outcome of host-virus interactions, systematic temporal analysis of the miRNA targetomes during productive viral infection has been technically challenging due to the large range of miRNA-mRNA cross-talks at the host-virus interface. High-confidence quantifying models of the suppression efficacy in targeting sites by integrating bioinformatics with Argonaute-crosslinking and immunoprecipitation followed by high-throughput sequencing (AGO-CLIP-seq) (Chi et al., 2009) data have been poorly developed. To accurately identify miRNA target sites and calculate the targeting efficacy of miRNA-target interactions, we developed a new bioinformatic quantitation method, ...
[摘要] 尽管已知在感染过程中基因表达的时间调节对于确定宿主 - 病毒相互作用的结果是至关重要的，但是在生产性病毒感染期间对miRNA targetomes的系统时间分析在技术上是具有挑战性的，因为大范围的miRNA- mRNA在主机 - 病毒接口交叉对话。数据通过将生物信息学与Argonaute-交联和免疫沉淀接着高通量测序（AGO-CLIP-seq）数据（Chi等人，2009）数据结合，已经不发达。为了准确地鉴定miRNA靶位点并计算miRNA-靶相互作用的靶向效果，我们开发了新的生物信息学定量方法，即AGO-CLIP-seq富集（ACE） - 评分算法（Kim等， 2015）。在我们的AGO-CLIP-seq分析中包括未感染的对照可以显着提高病毒或人miRNA的真实靶位点识别的准确性，并且在我们的ACE评分方法中提取生产性人巨细胞病毒（HCMV）感染期间的生理学显着变化。因此，我们建议我们新的基于ACE评分的方法可以应用于各种miRNA targetome研究，这将在其他类型的时间背景下进行，如发展阶段，细胞因子或病原体的免疫刺激和其他病毒。
|
|
|