DNA Sequencing Explains How Scientists Identify COVID-19 Variants
Researchers use DNA sequencing to track mutations in the SARS-CoV-2 virus and identify new variants like Omicron. This process reveals changes in the virus's genetic code that affect how it spreads and evades immunity.
Scientists identify new COVID-19 variants like Omicron through a process called DNA sequencing. This technique determines the exact order of the four chemical building blocks that make up the virus's genome. When the virus replicates, copying errors occasionally cause mutations that swap, delete, or insert these building blocks, ultimately altering the virus's physical characteristics.
These genetic changes matter because they can modify how the SARS-CoV-2 virus spreads, causes infections, or evades the human immune system. The same DNA sequencing tools that microbiologists use to study antibiotic resistance in bacteria are now essential for tracking the coronavirus. By reading the virus's genetic instruction sheets, researchers quickly spot the specific mutations that define a new variant.
While older methods like Sanger sequencing provide highly accurate data by cutting DNA into short, tagged fragments, they process genetic information very slowly. Today, researchers rely on next-generation sequencing (NGS) technologies to analyze much higher volumes of DNA simultaneously. These advanced NGS platforms significantly reduce the time required to sequence a genome, allowing public health officials to detect and respond to emerging variants much faster.