How PCR Works at the Molecular Level At its core, PCR mimics natural DNA replication in a controlled thermal cycler, repeatedly heating and cooling the reaction mixture to drive distinct biochemical steps. Compatibility with downstream applications like sequencing and genotyping.
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It supports gene cloning, mutation detection, quantification of gene expression, and the construction of DNA libraries for next-generation sequencing. Pathogens such as viruses, bacteria, and parasites can be identified even when present at very low levels, which is crucial for early intervention and infection control.
Why PCR Is Indispensable in Clinical Diagnostics In clinical laboratories, PCR enables the detection of infectious agents with remarkable speed and sensitivity. During the denaturation step at high temperature, the double-stranded DNA separates into single strands.
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This capability has made it a foundational tool across molecular biology, forensic science, and clinical diagnostics, enabling work that would have been impractical or impossible just a few decades ago. Speed, with many protocols completed in a few hours.
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