Related Experiment Video
Updated: May 10, 2026

11:22
Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
Published on: October 15, 2019
Microbes, the gut and ankylosing spondylitis
Arthritis Research & Therapy
|June 12, 2013
Summary
The human microbiome, comprising trillions of bacteria, significantly impacts health. Advanced sequencing technologies now enable comprehensive studies of the microbiome
Area of Science:
- Microbiology
- Genomics
- Human Health
Background:
- The human body hosts a vast microbial community, with bacterial cells outnumbering human cells 10:1.
- The human intestine alone harbors approximately 100 trillion bacteria.
- Traditional microbiology methods provide limited insight into these complex microbial ecosystems.
Purpose of the Study:
- To highlight the profound impact of host-microbiome interactions on overall health.
- To emphasize the limitations of classic microbiology in studying microbial communities.
- To underscore the potential of advanced sequencing technologies for microbiome research.
Main Methods:
- Utilizing recent advances in sequencing technologies.
- Facilitating systematic and comprehensive studies of microbial communities.
- Moving beyond the limitations of culturing techniques in classic microbiology.
Main Results:
- Sequencing technologies offer a greatly expanded view of microbial communities.
- Systematic studies of the microbiome are now more feasible.
- Enhanced understanding of the microbiome's role in health and disease is emerging.
Conclusions:
- Comprehensive understanding of the human microbiome is crucial for advancing medical science.
- Insights into microbiome function can improve our understanding of disease pathogenesis.
- This knowledge may lead to targeted therapies for conditions like autoimmunity.
Related Concept Videos
Functions of the Gut Microbiota
The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
Microbiota of the Stomach and Small Intestine
The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...
Inflammatory Bowel Disease III: Crohn's Disease
Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
Microbiota of the Respiratory Tract
The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more like...
Microbiota of the Large Intestine
The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
Gut-Brain Axis
The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...
