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Polymerase Chain Reaction (PCR) - Articles and news items
Supplier news / 8 August 2016 / New England Biolabs, Inc.
Novel target enrichment technology, compatible with low input amounts from challenging sample types, uses a one-day workflow…
In this publication Imperacer® case studies demonstrate the advantage of broad assay range combined with excellent sensitivity for several Biologics on their way from R&D to clinics…
Molecular diagnostics and biomarker discovery are gaining increasing attraction in clinical research. This includes all fields of diagnostics, such as risk assessment, disease prognosis, treatment prediction and drug application success control. The detection of molecular clinical biomarkers is very widespread and can be developed on various molecular levels, like the genome, the epi-genome, the transcriptome, the proteome or the metabolome. Today, numerous high-throughput laboratory methods allow rapid and holistic screening for such marker candidates. Regardless of which molecular level is analysed, in order to detect biomarker candidates, high sample quality and a standardised and highly reproducible quantification workflow are prerequisites. This article describes an optimal and approved development strategy to discover and validate ‘transcriptional biomarkers’ in clinical diagnostics, which are in compliance with the recently developed MIQE guidelines. We focus on the importance of sample quality, RNA integrity, available screening and quantification methods, and biostatistical tools for data interpretation…
In this PCR in-depth focus: Mikael Kubista from TATAA Biocenter addresses biological heterogeneity with single cell profiling, a look at quantitative PCR in the assessment of novel hepatic cell models, plus Q&A with Bio-Rad’s Javier Alba…
Issue 6 2014 / 23 December 2014 / Natalia Meani and Manuela Vecchi
Recognised as one of the major scientific breakthroughs of the 20th century, polymerase chain reaction (PCR) is a quick and simple method to create, in a test tube, millions of copies of a given DNA segment from a complex mixture of genetic material. This method has greatly stimulated biochemical, molecular biology and genetic research and, given its ability to amplify DNA from limited amounts of biologic samples, including fossils, opened the way for new applications in medicine, genetics, biotechnology, forensics and paleobiology…
Challenges for qRT-PCR in detecting / quantifying microRNA in vitro and in vivo.
Emerging clinical applications of digital PCR.
Workshop Preview: Advanced 3d cell based assays, preparation, analysis and troubleshooting.
Integrated sample preparation and real-time PCR assay for the quantitation of E. coli host cell DNA…
The process of building robust PCR/qPCR assays is a matter of perseverance and consistency. A few questions that should be answered prior to starting development will help make the process more efficient and effective:
Does the assay need to simply detect the presence of the target (qualitative), or must it assign a value to the detected target (quantitative)? The development process for a qualitative or quantitative assay, although similar in many respects, ultimately will take different paths
In what type of matrix will samples be? Matrix plays an important role in both development and validation of the assay. If the assay is needed for multiple matrices (whole blood, plasma, serum, differing tissue types, etc.), each matrix must be evaluated individually to determine its impact on assay performance
Will extraction be required, and by what method? 4) What throughput will be needed?
Answering these questions early in the process will help prevent ‘reworks’ later.
Cell-free nucleic acids circulating in human blood were first described in 19481. However, it was not until the work of Sorengon and colleagues was published in 19942 that the importance of circulating nucleic acid (cfNA) was recognised. Today, the detection of diverse type of cfNA3 in blood and other body fluids is a valuable resource for the identification of a novel biomarker4,5. Although different types of cfNA have been described (including DNA, mRNA and microRNA), this review focuses on the isolation, detection and clinical utility of circulating microRNAs.
microRNAs (miRNAs) are an abundant class of short single stranded non-coding RNAs (~22 nts) that regulate gene expression at the posttranscriptional level. Interaction between an miRNA and any given of its mRNA targets results in either translation inhibition, mRNA degradation or a combination of both mechanisms. Therefore, miRNAs activity effectively reduces the transcriptional output of a target gene, without affecting its transcription rate. Currently, the sequence of over 60,000 microRNAs are deposited in the miRBase database [Version 17, April 20116]. miRNA activity has been associated with the control of a wide range of basic processes such as development, differentiation and metabolism. Detection of differential expression of miRNAs in many cases have established the basis for miRNA functional analysis and specific miRNA expression patterns can provide valuable diagnostic and prognostic indications, for example, in the context of human malignancies7,8. Moreover, the deregulation of the expression of miRNAs has been shown to contribute to cancer development through various kinds of mechanisms, including deletions, amplification or mutations involving miRNA loci, epigenetic silencing, as well as the dysregulation of transcription factors that target specific miRNAs9,10.
Abbott has received approval from the FDA to market its RealTime PCR test for measuring the viral load of hepatitis C…
The delivery of personalised medicine is a key goal of modern cancer medicine and refers to the tailoring of anticancer therapy to the molecular characteristics of an individual tumour. To facilitate personalised medicine, it is important to have robust and reproducible means of gaining molecular information about a patient’s cancer that can be used to guide clinical decision-making. There have therefore been tremendous efforts to identify molecular signatures – biomarkers – that can be used to help predict a cancer patient’s prognosis or their likelihood of a response to targeted drug therapies. Such molecular profiling has long been applied to haematological malignancies and is increasingly becoming the norm in the most common epithelial cancers such as lung and colorectal cancer. This article will focus on the role of the polymerase chain reaction (PCR) in helping to meet the challenges involved in the design, testing and delivery of personalised cancer medicine.
Cancer molecular pathology broadly relies on the comparison between diseased and normal tissues, with statistically validated differences revealing cancerassociated pathways. This approach, although comparatively one-dimensional, has been remarkably successful, enabling identification of many types of malignant biomarkers and providing the means to develop pharmaceutical agents directed against pertinent biological targets. Most typically during the progression of malignancies, pathologists employ morphological screening of cancerous tissues. However, this form of monitoring has significant limitations, particularly in the early stages of pre-treatment or during the clinical remission.
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