Helicobacter pylori typing as a tool for tracking human migration

Area of Science:

• Microbiology
• Human Evolution
• Epidemiology

Background:

• Helicobacter pylori strains show distinct phylogeographical patterns.
• Genotypes of H. pylori virulence factors (cagA, vacA) and MLST are used to study genomic diversity.
• H. pylori genotypes can serve as markers for human population migration.

Purpose of the Study:

• To define major H. pylori groups based on geographical associations using cagA, cag right end junction, and vacA genotypes.
• To utilize MLST for mapping human migration patterns.
• To highlight the importance of studying H. pylori molecular epidemiology before its decline.

Main Methods:

• Analysis of cagA and vacA genotypes, including subtypes and mosaic structures.
• Classification into five major geographical groups based on combined genotypes.
• Multilocus sequence typing (MLST) to identify modern and ancestral population types.

Main Results:

• Five major H. pylori groups were defined: East Asia, South/Central Asia, Iberian/Africa, and Europe types.
• MLST identified seven modern and six ancestral H. pylori population types.
• MLST analysis provided more detailed human migration information than human genetics alone.

Conclusions:

• H. pylori genotypes are valuable markers for reconstructing human migration history.
• MLST is a powerful tool for understanding past human population movements.
• Urgent study of H. pylori molecular epidemiology is needed due to declining infection rates.