| A One-enzyme RT-qPCR Assay for SARS-CoV-2, and Procedures for Reagent Production
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Author:
Date:
2021-01-20
[Abstract] Given the scale of the ongoing COVID-19 pandemic, the need for reliable, scalable testing, and the likelihood of reagent shortages, especially in resource-poor settings, we have developed an RT-qPCR assay that relies on an alternative to conventional viral reverse transcriptases, a thermostable reverse transcriptase/DNA polymerase (RTX) (Ellefson et al., 2016). Here we show that RTX performs comparably to the other assays sanctioned by the CDC and validated in kit format. We demonstrate two modes of RTX use – (i) dye-based RT-qPCR assays that require only RTX polymerase, and (ii) TaqMan RT-qPCR assays that use a combination of RTX and Taq DNA polymerases (as the RTX exonuclease does not degrade a TaqMan probe). We also provide straightforward recipes for the purification of this ...
[摘要] [摘要]鉴于持续进行的COVID-19大流行的规模，可靠，可扩展的测试需求以及试剂短缺的可能性（尤其是在资源匮乏的环境中），我们开发了一种n RT-qPCR分析方法，该方法依赖于其他方法与常规病毒逆转录酶相比，热稳定的逆转录酶/ DNA聚合酶（RTX）（Ellefson等，2016）。在这里，我们显示RTX与CDC认可并以试剂盒形式验证的其他检测方法具有可比性。我们演示了两种RTX使用模式-（i）仅需要RTX聚合酶的基于染料的RT-qPCR分析，以及（ii）使用RTX和Taq DNA聚合酶组合的TaqMan RT-qPCR分析（因为RTX核酸外切酶不降级ea TaqMan探针）。我们还提供了纯化该替代试剂RTX的简单方法。我们预计，在资源匮乏或需要的地方，研究人员可以获取可用的构建体，并开始开发自己的测定方法，而不论它们存在的调控框架如何。
[背景]尽管已采用多种病毒检测方法来检测SARS-CoV-2感染，包括各种分子诊断和免疫诊断测试，但逆转录酶定量聚合酶链反应（RT-qPCR）仍然是主要且最敏感的方法SARS-CoV-2检测试验（D'Cruz等，2020 ; Tang等，2020 ）。RT-qPCR的首要地位在很大程度上是因为基于抗体的测试以及快速核酸诊断平台（如Abbott ...
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| Plant Sequence Capture Optimised for Illumina Sequencing
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Author:
Date:
2014-07-05
[Abstract] Plant Sequence Capture is used for targeted resequencing of whole exomes (all exons of a genome) of complex genomes e.g. barley and its relatives (Mascher et al., 2013). Sequencing and computing costs are significantly reduced since only the greatly enriched and gene-coding part of the barley genome is targeted, that corresponds to only 1-2% of the entire genome. Thus, applications such as genetic diversity studies and the isolation of single genes (“cloning-by-sequencing”) are greatly facilitated. Here, a protocol is provided describing the construction of shotgun DNA libraries from genomic barley DNA for sequencing on the Illumina HiSeq/MiSeq systems. The shotgun DNA sequencing libraries are hybridized to an oligonucleotide pool (Exome Library) encompassing the whole ...
[摘要] 植物序列捕获用于复杂基因组（例如大麦及其亲属）的整个外显子（基因组的所有外显子）的靶向重测序（Mascher等人，2013）。测序和计算成本显着降低，因为只有大麦基因组的大量富集和基因编码部分被靶向，其仅对应于整个基因组的1-2％。因此，大大促进了诸如遗传多样性研究和单个基因的分离（"通过测序克隆"）的应用。这里，提供了描述来自基因组大麦DNA的Shotgun DNA文库的构建以在Illumina HiSeq/MiSeq系统上测序的方案。鸟枪DNA测序文库与包含大麦整个外显子组的寡核苷酸池（Exome Library）杂交。外显子组库作为包含生物素化探针（Roche/NimbleGen）的液体阵列提供。随后，使用链霉亲和素包被的磁珠对与Exome文库杂交的基因组鸟枪DNA片段进行亲和纯化。捕获的文库被PCR扩增和测序，使用高通量短读序列合成
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| A Quick, No Frills Approach to Mouse Genotyping
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Author:
Date:
2012-08-05
[Abstract] Mice are extremely powerful mammalian genetic model organisms for basic and medical research, but managing a colony of transgenic mice is time consuming and expensive, many times requiring the help of dedicated technicians. Slow and laborious genotyping procedures add to the hassle. Outsourcing is costly and may not be as fast as desired, especially when setting up time sensitive experiments. Ultrafast genotyping protocols often require real-time PCR instruments and commercial reagents that may not be economical or practical. This protocol, adapted from methods suggested by The Jackson Laboratory, employs a minimalist approach that maximizes convenience by simplifying the tissue digestion/DNA extraction process and using a high-speed electrophoresis system for sample analysis. Genotype ...
[摘要] 该实验方案的中文版正在准备中．．．
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