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How did DNA sequencing and next-generation sequencing change biological research?

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A step-by-step diagram shows donor DNA and vector DNA cut with restriction enzymes to create overhangs, mixed and sealed with ligase to form recombinant DNA, which is introduced into bacterial cells. The recombinant DNA replicates as the cells divide, producing clones. — biotechnology Steps involved in the engineering of a recombinant DNA molecule.

DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule, providing the fundamental blueprint for understanding genetic function and evolution.1

The Shift to Next-Generation Sequencing

First-generation technologies, such as the Sanger method, emerged in the 1970s and relied on labor-intensive processes like gel electrophoresis to read DNA sequences. These have been largely supplanted by next-generation sequencing (NGS), also known as massively parallel sequencing.12

NGS transformed biological research in several key ways:
* Efficiency and Scale: NGS allows for the simultaneous sequencing of millions of DNA fragments, making it significantly faster and more cost-effective than earlier methods.12
* Data Handling: Advances in bioinformatics have enabled researchers to store, manipulate, and analyze massive datasets, often in the gigabase range.1
* Research Applications: These technologies have facilitated whole-genome sequencing, the discovery of disease-related genes, and a deeper understanding of genomic structure and species diversity. Projects like the 1000 Genomes Project utilized these high-throughput methods to map genetic variations, advancing fields such as medicine and personalized medicine.13