DNA Sequencing Methods


While DNA-sequencing methods are diverse and complex they can be grouped into three categories which share several common features: 1. DNA Fragmentation, 2. Fragment Amplification, 3. Sequencing via Fluorescent-Synthesis. These categories are:

Sanger-Sequencing which was invented in the 1970’s and was improved several times through the 2000’s. Sanger-Sequencing is especially good at sequencing large fragments and is often the de novo genome sequencing and variant detection.

Next Generation-Sequencing was developed by several companies in the 2000’s, is best at sequencing short fragments and is most useful when a draft genome in available. Next Generation sequencing is best at quantifying DNA copy number, gene expression levels (RNAseq), and studying chromosome dynamics (ChIPseq, ATACseq, etc.).

Finally, Single Molecule methods are the newest approaches which combine advantages and disadvantages of previous methods but are often highly portable.



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