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Updated: Oct 28, 2025
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Extraction of High Molecular Weight Genomic DNA from Soils and Sediments
Published on: November 10, 2009
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High-molecular weight DNA extraction, clean-up and size selection for long-read sequencing
Ashley Jones1, Cynthia Torkel1, David Stanley1,2
1Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia.
Plos One
|July 15, 2021
Summary
This study introduces a cost-effective, scalable protocol for extracting high-molecular weight DNA, crucial for long-read sequencing. The method minimizes DNA fragmentation, enabling high-quality genome assemblies in plants, fungi, and other organisms.
Area of Science:
- Genomics
- Molecular Biology
- Bioinformatics
Background:
- Long-read sequencing technologies have advanced significantly, enabling chromosome-scale genome assemblies.
- Extracting high-molecular weight DNA (HMW DNA) is a critical bottleneck, especially for challenging samples like plants and fungi.
- Existing DNA extraction methods can lead to DNA fragmentation, limiting read lengths.
Purpose of the Study:
- To present a comprehensive protocol collection for HMW DNA extraction, clean-up, and size selection tailored for long-read sequencing.
- To optimize a gentle, magnetic bead-based HMW DNA extraction protocol that avoids harsh centrifugation and spin columns.
- To provide a scalable and cost-effective solution applicable to diverse species and low-resource settings.
Main Methods:
- Developed a gentle, magnetic bead-based DNA extraction protocol minimizing mechanical stress.
- Incorporated optional sorbitol wash for plant and fungal tissues to remove inhibitors.
- Included optional DNA clean-up and size selection strategies to remove contaminants like phenols and polysaccharides.
- Validated the protocol for various species including plants, fungi, reptiles, and bacteria.
Main Results:
- The optimized protocol effectively extracts HMW DNA, suitable for long-read sequencing platforms (PacBio, Oxford Nanopore).
- Magnetic bead-based extraction circumvents spin columns and high-centrifugation, significantly reducing DNA fragmentation.
- Sequencing on Oxford Nanopore MinION yielded N50 read lengths of 30-50 kb, with reads exceeding 200 kb and outputs of 15-30 Gbp.
- The protocol is scalable and cost-effective, demonstrating applicability across diverse sample types.
Conclusions:
- This protocol collection addresses the critical challenge of HMW DNA extraction for long-read sequencing.
- The gentle, scalable, and cost-effective method facilitates high-quality genome assembly for a wide range of organisms.
- The protocol collection is suitable for various long-read sequencing technologies, enhancing genomic research capabilities.
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