Identifying and quantifying genotypes in polyclonal infections due to single species

Area of Science:

• Infectious Diseases
• Molecular Biology
• Genetics

Background:

• Simultaneous infections with multiple pathogen strains are common for diseases like HIV, malaria, and hepatitis C.
• Current diagnostic methods struggle to differentiate and quantify various pathogen genotypes within an individual.
• Detecting novel genetic insertions or deletions in organisms, including those for bioterrorism, remains a challenge.

Purpose of the Study:

• To develop a novel strategy for simultaneous detection and quantification of pathogen genotypes.
• To enable the identification of multiple strains and their respective genotypes in individual patients.
• To provide a tool for assessing genetic modifications in organisms.

Main Methods:

• Utilized real-time polymerase chain reaction (PCR) with allotype-specific primers to identify pathogen strains and infection intensity.
• Employed capillary electrophoresis to determine the number of genotypes within each strain and their infection intensity.
• Applied the combined strategy to study malaria genotypes and assess genetic modifications.

Main Results:

• The real-time PCR method successfully defined the presence and intensity of different pathogen allotypes (strains).
• Capillary electrophoresis accurately quantified the number of genotypes within each allotype and their respective infection levels.
• The strategy demonstrated efficacy in analyzing complex malaria infections with multiple genotypes.

Conclusions:

• The developed strategy offers a robust method for simultaneously identifying and quantifying multiple pathogen genotypes in individual infections.
• This approach is valuable for epidemiological studies of emerging infectious diseases with diverse genotypes, such as malaria.
• The method can also be applied to detect genetic insertions or deletions in genetically modified organisms, with implications for biosecurity.