Related Experiment Video
Updated: Jun 20, 2026
07:43
Mouse Models Of Helicobacter Infection And Gastric Pathologies
Published on: October 18, 2018
Helicobacter pylori Sequences Reflect Past Human Migrations
Genome Dynamics
|August 22, 2009
Summary
Helicobacter pylori (H. pylori) DNA reveals human migration patterns. This stomach bacterium
Area of Science:
- Microbial genomics
- Human population genetics
- Evolutionary biology
Background:
- Helicobacter pylori (H. pylori) has a long association with humans.
- Its high DNA diversity and transmission routes make it a valuable marker for human history.
- Understanding H. pylori evolution can illuminate human migration patterns.
Purpose of the Study:
- To use H. pylori genetic diversity to trace ancient and recent human population movements.
- To investigate the co-evolutionary history of H. pylori and humans.
- To confirm the origin of H. pylori and humans from Africa.
Main Methods:
- Analyzing a large, globally distributed dataset of H. pylori DNA sequences.
- Partitioning sequences into geographic populations and sub-populations.
- Deducing ancestral population structure from modern H. pylori sequences.
Main Results:
- H. pylori population structure mirrors human population structure globally.
- Recent human migrations (e.g., European expansion, slave trade) were detected.
- Prehistoric movements (e.g., Americas settlement, Bantu migrations) were traced.
- Zones of admixture and multiple migration waves into regions like Europe were identified.
Conclusions:
- H. pylori serves as a reliable marker for both recent and ancient human population movements.
- Humans carried H. pylori out of Africa during their migrations.
- The study confirms a long-standing co-evolutionary relationship between H. pylori and humans.
More Related Videos
03:33Rapid Detection of Fecal Antigen of Helicobacter pylori Infection Based on Double Antibody Sandwich Detection Technology
Published on: May 23, 2025
05:23Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance
Published on: March 7, 2025
Related Concept Videos
01:26Gastritis II: Pathophysiology
The pathophysiology of gastritis begins with the colonization of the stomach lining by Helicobacter pylori (H. pylori). This bacterium spreads mainly via the oral-oral route through saliva or shared utensils, and can also be transmitted in overcrowded or unhygienic environments through contaminated water, despite its brief survival outside the body.ColonizationOnce ingested, H. pylori enters the stomach and begins colonization by navigating through the mucus layer lining the stomach wall. It...
01:27Peptic Ulcer
Peptic ulcers are erosive lesions of the gastric or duodenal lining, most commonly caused by Helicobacter pylori infection. This Gram-negative, helical bacterium has adapted to survive the stomach’s acidic environment by producing urease, which converts urea into ammonia and carbon dioxide. The ammonia neutralizes gastric acid in the bacterium’s immediate environment, allowing colonization of the gastric mucosa. H. pylori attaches to mucus-secreting epithelial cells, penetrates the mucus...
02:51Multi-species Conserved Sequences
Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
02:31Synteny and Evolution
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
01:27Horizontal Gene Transfer
Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...
01:56Gastrulation
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...