| Detection of Pathogens and Ampicillin-resistance Genes Using Multiplex Padlock Probes
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Author:
Date:
2017-08-20
[Abstract] Diagnostic assays for pathogen identification and characterization are limited either by the number of simultaneously detectable targets, which rely on multiplexing methods, or by time constraints due to cultivation-based techniques. We recently presented a 100-plex method for human pathogen characterization to identify 75 bacterial and fungal species as well as 33 clinically relevant β-lactamases (Barišić et al., 2016). By using 16S rRNA gene sequences as barcode elements in the padlock probes, and two different fluorescence channels for species and antibiotic resistance identification, we managed to cut the number of microarray probes needed by half. Consequently, we present here the protocol of an assay with a runtime of approx. 8 h and a detection limit of 105 cfu ...
[摘要] 用于病原体鉴定和表征的诊断测定法由依赖于多重方法的同时可检测目标的数量或由于基于培养的技术的时间限制来限制。 我们最近提出了一种用于人类病原体鉴定的100plex方法，以鉴定75种细菌和真菌物种以及33种临床相关β-内酰胺酶（Barišić等，2016）。 通过使用16S rRNA基因序列作为挂锁探针中的条形码元件，以及用于物种和抗生素抗性鉴定的两种不同的荧光通道，我们设法将需要的微阵列探针的数量减少一半。 因此，我们在这里介绍一个运行时间约为的测定方案。 8 h，检测限为105 cfu ml-1。 正确鉴定了89％的β-内酰胺酶和93.7％的物种。
【背景】β-内酰胺酶是一类提供抗β-内酰胺抗生素的抗生素抗性基因，其结构模拟D-丙氨酰-D-丙氨酸，细菌细胞壁的一个组分，从而抑制细菌细胞壁合成。 β-内酰胺酶能够水解β内酰胺抗生素β-内酰胺环的中心成分，并使其无效（Kong et al。，2010）。今天，描述了超过1000种β-内酰胺酶，并且存在巨大的潜在环境储层（Bush，2010; Brandt等，2017）。 ...
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| Primer Extension Analysis of HBV DNA with Strand-Specific Primers
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Author:
Date:
2015-08-05
[Abstract] We performed primer extension assay to determine which steps of HBV DNA synthesis (i.e., minus- and plus-strand DNA synthesis and circularization of RC DNA) are affected by phosphoacceptor site mutations in C protein. In these experiments, we used several specific oligonucleotide primers. For quantitation, the level of extended DNA (ED) was normalized to the level of a single internal standard (IS) DNA.
[摘要] 我们进行引物延伸测定以确定HBV DNA合成的哪些步骤（即，负链和正链DNA合成和RC DNA的环化）受C蛋白中的磷酸受体位点突变的影响。 在这些实验中，我们使用几种特异性寡核苷酸引物。 为了定量，将延伸DNA（ED）的水平标准化为单个内标（IS）DNA的水平。
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