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Guided Protocol for Fecal Microbial Characterization by 16S rRNA-Amplicon Sequencing

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Processing faecal samples: a step forward for standards in microbial community analysis.

Alba Santiago, Suchita Panda, Griet Mengels

¹Vall d'Hebron Research Institute, Digestive System Research Unit, Passeig de la Vall d'Hebron 119-129, Barcelona 08035, Spain. cmanicha@gmail.com.

BMC Microbiology

|June 3, 2014

Summary

This summary is machine-generated.

Stool hydration and homogenization do not significantly alter microbiome composition. However, bead-beating is crucial for accurately detecting Gram-positive bacteria in stool samples for microbial analysis.

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Area of Science:

Microbiology
Genomics
Bioinformatics

Background:

Standardized protocols are essential for accurate stool microbiome analysis.
Investigating stool layers, water content, and disruption methods is key to unbiased microbial composition analysis.

Purpose of the Study:

To determine if different stool layers are equally representative of the microbiome.
To assess the impact of stool water content and microbial disruption methods on DNA integrity and microbiome analysis.

Main Methods:

Faecal samples from healthy subjects were analyzed using 16S rRNA gene pyrosequencing.
Inner and outer stool layers were compared for microbial composition.
Stool samples with varying water content and bead-beating methods were analyzed.

Main Results:

Minor differences in microbial composition were observed between inner and outer stool layers, not significantly biasing individual microbiome profiles.
Stool water content did not affect sample clustering based on microbial community.
The use of bead-beating significantly altered the proportions of Gram-positive and Gram-negative bacteria and sample clustering.

Conclusions:

Stool hydration and homogenization methods do not significantly impact overall microbial community composition.
Bead-beating is a critical step for the accurate detection of Gram-positive bacteria, such as Blautia and Bifidobacterium, in stool microbiome analysis.