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Malaria is a cause of iron deficiency in African children
John Muthii Muriuki1,2, Alexander J Mentzer3,4, Ruth Mitchell5
1Kenya Medical Research Institute (KEMRI), Centre for Geographic Medicine Research, Coast, KEMRI-Wellcome Trust Research Programme, Kilifi, Kenya. jmuriuki@kemri-wellcome.org.
Insights
Malaria significantly contributes to iron deficiency (ID) in African children. Genetic analysis shows that reducing malaria risk could decrease ID prevalence by nearly 50%, highlighting a crucial public health link.
Area of Science:
- Public Health
- Genetics
- Tropical Medicine
Background:
- Malaria and iron deficiency (ID) are prevalent, interconnected health issues in African children.
- Observational studies indicate a correlation between reduced malaria transmission and lower ID rates.
Purpose of the Study:
- To investigate the causal relationship between malaria and iron deficiency in African children.
- To utilize Mendelian randomization with sickle cell trait (HbAS) as a genetic instrument for malaria risk.
Main Methods:
- Mendelian randomization analysis employing sickle cell trait (HbAS) as an instrumental variable.
- Analysis of data from children in malaria-endemic and malaria-free regions of Africa.
Main Results:
- HbAS was linked to a 30% reduction in ID among children in malaria-endemic areas, but not in malaria-free zones.
- Genetically predicted malaria risk showed a significant association with increased odds of ID (OR=2.65 per unit increase in log malaria incidence rate).
Conclusions:
- Malaria is a likely causal factor for iron deficiency in African children.
- Interventions reducing malaria risk could substantially decrease the prevalence of iron deficiency, potentially by 49% if malaria risk is halved.
Abstract:
Malaria and iron deficiency (ID) are common and interrelated public health problems in African children. Observational data suggest that interrupting malaria transmission reduces the prevalence of ID1. To test the hypothesis that malaria might cause ID, we used sickle cell trait (HbAS, rs334 ), a genetic variant that confers specific protection against malaria2, as an instrumental variable in Mendelian randomization analyses. HbAS was associated with a 30% reduction in ID among children living in malaria-endemic countries in Africa (n = 7,453), but not among individuals living in malaria-free areas (n = 3,818). Genetically predicted malaria risk was associated with an odds ratio of 2.65 for ID per unit increase in the log incidence rate of malaria. This suggests that an intervention that halves the risk of malaria episodes would reduce the prevalence of ID in African children by 49%.
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