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DNA Isolation

DNA Isolation

DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...

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Related Experiment Video

Updated: Jul 8, 2025

DNA Extraction from 0.22 μM Sterivex Filters and Cesium Chloride Density Gradient Centrifugation

DNA Extraction from 0.22 μM Sterivex Filters and Cesium Chloride Density Gradient Centrifugation

Published on: September 18, 2009

Benchmarking DNA isolation methods for marine metagenomics.

Alina Demkina^1,2, Darya Slonova¹, Viktor Mamontov¹

¹Skolkovo Institute of Science and Technology, Moscow, Russia.

Scientific Reports

|December 13, 2023

Summary

Selecting the right DNA isolation kit is crucial for accurate marine microbial community analysis. This study evaluates eight kits across three sample types, providing a guide to optimize metagenomic research.

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Last Updated: Jul 8, 2025

DNA Extraction from 0.22 μM Sterivex Filters and Cesium Chloride Density Gradient Centrifugation

DNA Extraction from 0.22 μM Sterivex Filters and Cesium Chloride Density Gradient Centrifugation

Published on: September 18, 2009

Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology

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Published on: November 5, 2014

Simultaneous DNA-RNA Extraction from Coastal Sediments and Quantification of 16S rRNA Genes and Transcripts by Real-time PCR

Simultaneous DNA-RNA Extraction from Coastal Sediments and Quantification of 16S rRNA Genes and Transcripts by Real-time PCR

Published on: June 11, 2016

Area of Science:

Marine Biology
Microbial Ecology
Molecular Biology
Bioinformatics

Background:

Metagenomics offers powerful insights into marine microbial communities.
High-quality environmental DNA (eDNA) isolation is critical but challenging.
DNA purification methods significantly impact results and introduce biases.

Purpose of the Study:

To systematically evaluate the efficiency of eight commercial DNA isolation kits.
To compare DNA purification performance across three distinct marine sample types: water, sediment, and invertebrate digestive tracts.
To identify biases and contaminants associated with different DNA isolation procedures.

Main Methods:

Eight commercially available DNA isolation kits were tested.
Three sample types (water, sea sediment, Magallana gigas digestive tract) were used.
Evaluated parameters included DNA yield, fragmentation, PCR inhibitors, eukaryotic DNA contamination, alpha-diversity, reproducibility, and kit-specific contaminants ('kitome').
Community composition was assessed using 16S rRNA amplicon sequencing.

Main Results:

Significant variations in DNA quality, quantity, and purity were observed among kits and sample types.
Specific kits exhibited distinct contamination profiles ('kitomes').
DNA isolation methods demonstrably influenced microbial community structure and diversity metrics.
Reproducibility varied depending on the kit-sample combination.

Conclusions:

The choice of DNA isolation kit and sample type critically affects metagenomic study outcomes.
A comprehensive evaluation matrix was developed to guide the selection of optimal DNA purification strategies.
Understanding kit-specific biases is essential for accurate interpretation of marine microbial community data.