08/20/2026
🧬 What Is Next-Generation Sequencing?
Next-Generation Sequencing (NGS) is a laboratory technology used to read genetic material - determining the precise order of the building blocks that make up DNA and RNA. 🔬
DNA is written in an alphabet of just four bases - A, T, G, and C - arranged in sequences that carry biological information. "Sequencing" simply means reading that order, one base at a time. RNA is read in much the same way. By working out these sequences, scientists can study the genetic and molecular information held within a sample.
A defining feature of NGS is that it can read large numbers of DNA or RNA fragments at the same time, producing a high volume of genetic data from a single run. 📊
At a high level, the process moves through a few stages:
🧪 Sample & library preparation — genetic material is isolated and made ready for sequencing
🔍 Sequencing — the instrument reads the order of bases across many fragments in parallel
💻 Data analysis — specialized bioinformatics tools process, organize, and analyze the resulting data
Because it generates so much data, NGS pairs hands-on laboratory work with computational analysis. It remains one of the core technologies for studying genetic and molecular information today.
For educational purposes only. Not medical advice.
