Genetic Factors in Malaria Susceptibility in Thailand
Author Information
Author(s): Phimpraphi Waraphon, Paul Richard, Witoonpanich Bhee, Turbpaiboon Chairat, Peerapittayamongkol Chayanon, Louicharoen Chalisa, Casademont Isabelle, Tungpradabkul Sumalee, Krudsood Srivicha, Kaewkunwal Jaranit, Sura Thanyachai, Looareesuwan Sornchai, Singhasivanon Pratap, Sakuntabhai Anavaj
Primary Institution: Institut Pasteur, Laboratoire de la Génétique de la réponse aux infections chez l'homme, Paris, France
Hypothesis
What is the relative contribution of genetic versus environmental factors to malaria infection and disease in a Karen population in Thailand?
Conclusion
Genetic factors significantly influence the outcome of malaria infections, with a notable contribution to the number of clinical episodes and parasite density.
Supporting Evidence
- The genetic contribution to clinical episodes of P. falciparum was estimated at 10%.
- The genetic contribution to clinical episodes of P. vivax was estimated at 19%.
- Moderate genetic contributions were observed for maximum and overall parasite density for both P. falciparum and P. vivax.
- Environmental factors significantly influenced malaria infection rates.
- Household effects were noted but were less significant for P. vivax compared to P. falciparum.
- Age was a significant factor influencing malaria incidence and outcomes.
- Genetic factors explained more variability in malaria phenotypes than environmental factors.
- Previous infections with P. vivax were associated with higher P. falciparum densities.
Takeaway
This study shows that genes can affect how people get sick from malaria, even though the environment also plays a role.
Methodology
A longitudinal cohort study was conducted to assess the genetic and environmental contributions to malaria infection in a Karen population.
Potential Biases
Potential biases may arise from the reliance on self-reported data and the specific demographic of the study population.
Limitations
The study may not be generalizable to other populations due to its specific ethnic and geographic focus.
Participant Demographics
The study involved 3,484 individuals from a Karen population, primarily aged between 1 and 39 years.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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