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Guided Protocol for Fecal Microbial Characterization by 16S rRNA-Amplicon Sequencing
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This study compared a novel stool collection tube to freezing for preserving fecal samples. While organic acid metabolites were comparable, the collection tube method altered the microbial community profile, favoring Gram-negative bacteria.

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Area of Science:

  • Microbiology
  • Biotechnology
  • Clinical Trials

Background:

  • Clinical trial fecal sample collection faces challenges like participant variability and geographical dispersion.
  • Existing sample preservation techniques show inconsistent results and often assess only DNA or metabolites, not both.
  • Accurate fecal sample preservation is crucial for reliable microbiome and metabolomic research.

Purpose of the Study:

  • To evaluate the efficacy of the Stool Nucleic Acid Collection and Preservation Tube (Norgen BioTek Corp) for preserving both microbial DNA and organic acid metabolites in human fecal samples.
  • To compare the preservation capabilities of the collection tubes against traditional frozen storage (-20°C).
  • To identify potential biases introduced by the collection method on microbial community composition and metabolite profiles.

Main Methods:

  • Twenty-six healthy adults collected fecal samples, with subsamples placed in Norgen BioTek collection tubes and the remainder immediately frozen at -20°C.
  • Organic acid concentrations were analyzed to assess metabolite preservation.
  • 16S rRNA gene sequencing was performed to compare microbial DNA profiles between the two collection methods.

Main Results:

  • Organic acid concentrations were comparable between samples stored in collection tubes and fresh frozen samples when tubes were used correctly.
  • Significant differences in bacterial genera were observed between the two collection methods using 16S rRNA gene sequencing.
  • Gram-negative bacterial genera were more abundant in samples from collection tubes, while Gram-positive genera were more abundant in fresh frozen samples.

Conclusions:

  • The Stool Nucleic Acid Collection and Preservation Tube can preserve organic acid metabolites effectively but introduces a bias in the microbial community profile, favoring Gram-negative bacteria.
  • The observed bias based on Gram status highlights the importance of considering collection and storage methods in study design.
  • Researchers must account for potential biases introduced by fecal collection techniques to ensure accurate interpretation of microbiome data.