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Updated: May 2, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
Published on: October 15, 2019
Gut microbiota and liver disease
Amit Goel1, Mahesh Gupta, Rakesh Aggarwal
1Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India.
Abstract:
Microbes are present in large numbers in each human being, in particularly in the gastrointestinal (GI) tract, and have long been believed to have some beneficial effects for their hosts. Till recently, however, we lacked tools for studying these organisms. Rapid technological advances in recent years have markedly improved our understanding of their role both in health and disease. Recent literature suggests that organisms in the GI tract, referred to collectively as gut microbiota, play an indispensable role in the maintenance of host's homeostasis. Alterations in the gut microbiota, that is in the nature and relative density of various constituent bacterial species, appear to have a role in pathogenesis and progression of several GI and hepatic diseases. This has also opened the vista for tinkering with gut flora in an attempt to treat or prevent such diseases. In this review, we have tried to summarize information on normal gut microbiota, laboratory techniques and animal models used to study it, and the role of its perturbations in some of the common hepatic disorders, such as non-alcoholic fatty liver disease (including obesity), non-alcoholic steatohepatitis, alcoholic liver disease, and liver cirrhosis and its complications.
Insights
The gut microbiota plays a crucial role in maintaining host homeostasis. Understanding its composition and alterations is key to diagnosing and treating gastrointestinal and liver diseases.
Area of Science:
- Microbiology
- Gastroenterology
- Hepatology
Background:
- The human gastrointestinal tract hosts a vast number of microbes, collectively known as gut microbiota.
- Historically, studying these microbes was challenging, but recent technological advancements have improved our understanding of their roles in health and disease.
- The gut microbiota is increasingly recognized for its indispensable role in maintaining host homeostasis.
Purpose of the Study:
- To review current knowledge on normal gut microbiota.
- To summarize laboratory techniques and animal models used for studying gut microbiota.
- To explore the role of gut microbiota perturbations in common hepatic disorders.
Main Methods:
- Literature review of recent scientific publications.
- Summary of established and emerging laboratory techniques for microbiota analysis.
- Overview of animal models utilized in gut microbiota research.
Main Results:
- Gut microbiota alterations are implicated in the pathogenesis and progression of various gastrointestinal and hepatic diseases.
- Specific liver conditions discussed include non-alcoholic fatty liver disease (NAFLD), non-alcoholic steatohepatitis (NASH), alcoholic liver disease (ALD), and liver cirrhosis.
- Perturbations in gut flora present therapeutic and preventative strategies for liver disorders.
Conclusions:
- The gut microbiota is a significant factor in liver disease development and progression.
- Targeting the gut microbiota offers potential therapeutic avenues for managing hepatic disorders.
- Further research into gut microbiota composition and function is crucial for advancing liver disease treatment.
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