Age Patterns of IgE in Indigenous Populations and the U.S.
Author Information
Author(s): Blackwell Aaron D., Gurven Michael D., Sugiyama Lawrence S., Madimenos Felicia C., Liebert Melissa A., Martin Melanie A., Kaplan Hillard S., Snodgrass J. Josh
Primary Institution: University of California, Santa Barbara
Hypothesis
The age-profile of IgE levels varies across populations with different helminth infection rates.
Conclusion
The study found that IgE levels peak earlier in populations with higher helminth infections, suggesting a peak shift in immune response.
Supporting Evidence
- Tsimane had the highest IgE levels (geometric mean = 8,182 IU/ml).
- Shuar IgE levels were significantly higher than NHANES values.
- Helminth infections were prevalent in Tsimane, with hookworm and Ascaris lumbricoides being the most common.
- Age-patterning of IgE levels was consistent with the peak shift model.
- Male participants had higher IgE levels than females across all populations.
Takeaway
Kids in places with lots of worms in their tummies have higher allergy-fighting proteins called IgE, and they reach their highest levels earlier than kids in the U.S.
Methodology
Total IgE levels were assessed in serum and dried blood spots, and age-patterns were examined using non-linear regression models.
Potential Biases
Potential biases may arise from differences in health care access and environmental factors among populations.
Limitations
The study lacks specific IgE data for helminth species in the Shuar and NHANES populations.
Participant Demographics
Participants included the Tsimane (n=832), Shuar (n=289), and U.S. NHANES (n=8,336) with varying ethnic backgrounds.
Statistical Information
P-Value
p<0.001
Confidence Interval
(1,691–39,582)
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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