Comparison Of Different Methods To Isolate HMW DNA From Bacteria For Nanopore Sequencing

By Christina Engesser, NGS Competence Center Tübingen, and Whitney Pike, Agilent Technologies

Achieving reliable long‑read sequencing outcomes hinges on the integrity and size of the starting genomic DNA. Examine how different high–molecular weight extraction methods influence fragment length, purity, and ultimately sequencing performance. By comparing five commonly used approaches—from bead‑based and magnetic chemistries to gravity‑flow and column formats—this application note highlights how each method shapes the resulting DNA profile, including the presence of ultrahigh‑molecular‑weight fragments needed for extended read lengths. It also illustrates how capillary electrophoresis–based QC can reveal critical differences in sample integrity before libraries are prepared, preventing downstream issues and ensuring researchers select the most effective workflow for their project goals.

If you’re evaluating extraction options for long‑read or nanopore sequencing, access the full asset to help guide your decision-making.