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Related Concept Videos

DNA Isolation01:24

DNA Isolation

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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

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Guided Protocol for Fecal Microbial Characterization by 16S rRNA-Amplicon Sequencing
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Published on: March 19, 2018

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High-throughput DNA extraction strategy for fecal microbiome studies.

Heidi Isokääntä1,2, Natalie Tomnikov3, Sanja Vanhatalo1

  • 1Infections and Immunity Unit, Institute of Biomedicine, University of Turku, Turku, Finland.

Microbiology Spectrum
|May 15, 2024
PubMed
Summary
This summary is machine-generated.

Optimizing DNA isolation from thousands of fecal samples is crucial for large microbiome studies. Bead beating and specific protocols enhance DNA yield and bacterial diversity, enabling reproducible results for gut microbiome analysis.

Keywords:
DNA extractionfecal samplegut microbiomehigh throughputmethod developmentsample preservative

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Area of Science:

  • Microbiome research
  • Gut microbiota analysis
  • Molecular biology techniques

Background:

  • Large-scale microbiome studies require high-throughput DNA isolation methods for fecal samples.
  • Standardization of DNA extraction protocols is essential to minimize bias and improve consistency in next-generation sequencing (NGS) based gut microbiota profiling.
  • Existing protocols may introduce variability, impacting the reliability of microbiome data across different studies and laboratories.

Purpose of the Study:

  • To identify an optimal, rapid, and reproducible DNA isolation method for processing thousands of fecal samples.
  • To evaluate the impact of different sample preservatives and pre-treatment protocols on DNA yield, quality, and taxonomic profiles.
  • To assess the suitability of the Chemagic 360 instrument and Magnetic Separation Module I (MSMI) for automated, high-throughput fecal DNA extraction.

Main Methods:

  • Comparison of two sample preservatives (OMNIgeneGUT, DNA/RNA shield fluid) and four pre-treatment protocols (bead beating, tube/plate format, proteinase K incubation).
  • DNA extraction using the Chemagic DNA Stool 200 H96 kit on human fecal samples (adult, senior, infant) with technical replicates, negative controls, and a ZymoBIOMICS Gut Microbiome Standard.
  • Assessment of DNA quantity (Qubit), purity/quality (gel electrophoresis), and taxonomic signatures (16S rRNA gene sequencing, V3V4 and V4 regions).

Main Results:

  • Bead beating significantly increased bacterial diversity, particularly for hard-to-lyse Gram-positive genera like *Blautia*, *Bifidobacterium*, and *Ruminococcus*.
  • Preservatives showed minor differences in bacterial abundances, and both were feasible for sample handling with low variation in taxonomic signatures.
  • The selected protocol, including bead beating, demonstrated reproducibility in DNA yield and taxonomic profiles, with the 96-format enabling automation for large sample collections.

Conclusions:

  • A standardized DNA isolation protocol incorporating bead beating is necessary for comprehensive gut microbiome analysis, especially for detecting low-abundance or difficult-to-lyse bacteria.
  • The Chemagic 360 and MSMI instrument facilitate high-throughput processing of fecal samples, crucial for large-scale microbiome studies.
  • Optimization of DNA extraction methods is vital for consistent and reliable gut microbiota profiling using 16S rRNA gene sequencing.