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Bacterial Flora of the Large Intestine01:29

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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
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Assessing the gastrointestinal (GI) system is a complex process that begins with collecting subjective data. This data, collected through patient interviews, provides crucial insights into the patient's health history, perception patterns, and lifestyle habits, all contributing significantly to GI health.
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Related Experiment Video

Updated: Nov 11, 2025

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Profiling the Gastrointestinal Microbiota.

Brunella Posteraro1, Flavio De Maio2, Antonio Gasbarrini3

  • 1Dipartimento di Scienze Mediche e Chirurgiche, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy. brunella.posteraro@unicatt.it.

Methods in Molecular Biology (Clifton, N.J.)
|March 25, 2021
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Summary
This summary is machine-generated.

This chapter details gastrointestinal microbiota profiling from human stool samples. It covers sample collection, DNA isolation, sequencing methods, and data analysis for actionable clinical insights.

Keywords:
16S ribosomal DNAMicrobial communityNext-generation sequencingPCR amplificationSequence-based analysisStool samplesTargeted amplicon sequencing

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Area of Science:

  • Microbiology
  • Genomics
  • Bioinformatics

Background:

  • The human gastrointestinal (GIT) microbiota plays a crucial role in health and disease.
  • Understanding GIT microbiota composition is essential for diagnosing and treating various conditions.
  • Standardized methods are needed for reliable microbiota profiling.

Purpose of the Study:

  • To describe a comprehensive methodology for gastrointestinal microbiota profiling.
  • To outline the key steps from sample collection to data interpretation.
  • To enable the generation of clinically actionable reports on GIT microbiota.

Main Methods:

  • Fecal sample collection and preservation.
  • Bacterial DNA isolation from stool specimens.
  • Selection of 16S ribosomal DNA (rDNA) sequencing targets and next-generation sequencing (NGS) platforms.
  • Bioinformatic analysis and interpretation of sequencing data.

Main Results:

  • A detailed protocol for GIT microbiota profiling is presented.
  • The methodology ensures robust data acquisition for microbial community analysis.
  • The process yields comprehensive reports on microbiota composition and structure.

Conclusions:

  • This methodological description provides a framework for standardized GIT microbiota profiling.
  • The described process can generate clinically relevant information on the gut microbiome.
  • Accurate microbiota profiling supports the development of targeted therapeutic strategies.