{"id":8673,"date":"2023-04-16T17:38:34","date_gmt":"2023-04-16T17:38:34","guid":{"rendered":"https:\/\/www.mybiosource.com\/learn\/?page_id=8673"},"modified":"2023-04-16T17:47:05","modified_gmt":"2023-04-16T17:47:05","slug":"pcr-based-diagnostics-for-infectious-diseases-genetic-disorders-and-cancer","status":"publish","type":"page","link":"https:\/\/www.mybiosource.com\/learn\/pcr-based-diagnostics-for-infectious-diseases-genetic-disorders-and-cancer\/","title":{"rendered":"PCR-based Diagnostics for Infectious Diseases, Genetic Disorders, and Cancer"},"content":{"rendered":"

The field of diagnostics has been transformed by Polymerase Chain Reaction (PCR), a widely used molecular biology<\/span> technique. By exponentially amplifying a small amount of DNA, PCR enables analysis to be conducted much more easily. Developed in 1983 by Kary Mullis, the technique has become a common and important tool in medical and biological research labs, with a variety of applications. These include DNA cloning<\/span> for sequencing, DNA-based phylogeny, or functional analysis of genes, as well as the diagnosis of hereditary diseases, the identification of genetic fingerprints, and the detection of infectious diseases.<\/p>\n

PCR has also facilitated the prompt diagnosis of malignant diseases, including leukemia and lymphomas, which are presently at the forefront of cancer research<\/span>. PCR assays can be conducted directly on genomic DNA samples<\/span> to identify translocation<\/span>-specific malignant<\/span> cells with a sensitivity that is at least 10,000 times greater than other methods. By enabling rapid and precise diagnoses, PCR helps in initiating appropriate treatments and avoiding unnecessary or invasive<\/span> investigations.<\/p>\n

PCR-Based Diagnostics for Infectious Disease Detection and Point-of-Care Testing<\/strong><\/h4>\n

Annually, hospitals in the USA report well over 5 million cases of infectious-disease-related illnesses. However, a significantly greater number of cases remain undetected in both inpatient and community settings, leading to substantial morbidity and mortality. Prompt and effective intervention for infectious diseases relies on the swift and precise identification of the pathogen in both acute care and other settings. However, conventional laboratories face several limitations, such as prolonged assay, additional testing to characterize detected pathogens, and the inability to culture certain pathogens associated with microbial infection.<\/p>\n

In developing countries with a high burden of infectious diseases, diagnostic challenges due to poor clinical laboratory infrastructure and cost constraints exacerbate the situation. Therefore, the potential for point-of-care<\/span> (POC) testing is even greater in these regions. One of the major priorities among the ‘Grand Challenges for Global Health’ identified by the Bill and Melinda Gates Foundation<\/span> and the NIH<\/span> is the development of POC technologies for diagnosing infectious diseases.<\/p>\n

PCR-based diagnostics have proven effective for a broad range of microbes, particularly for identifying organisms that cannot be grown in vitro or in cases where existing culture techniques are insensitive and require prolonged incubation periods. However, implementation in the clinical setting has had mixed success thus far, with only a limited number of assays approved by the US Food and Drug Administration<\/span> (FDA) and fewer still gaining universal acceptance in clinical practice.<\/p>\n

Quantitative real-time PCR represents a notable improvement in PCR technology, as it combines the amplification and detection of products in a single reaction vessel. This process represents a breakthrough in terms of clinical applicability since it eliminates the need for time-consuming post-amplification processing.<\/p>\n

The real-time PCR-based platform holds great promise in replacing conventional laboratory-based testing for future point-of-care testing. With advancements in automation, integration of specimen preparation with target identification, and miniaturization, it will become much easier to bring analyses near the bedside to be done by less-trained personnel.<\/p>\n