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Toll-like receptor (TLR) polymorphisms in African children: Common TLR-4 variants predispose to severe malaria

Open access
Mockenhaupt, Frank P., Cramer, Jakob P., Hamann, Lutz, Stegemann, Miriam S., Eckert, Jana, Oh, Na-Ri, Otchwemah, Rowland N., Dietz, Ekkehart, Ehrhardt, Stephan, Schröder, Nicolas W. J., Bienzle, Ulrich, Schumann, Ralf R.·2006·Proceedings of the National Academy of Sciences

Abstract

Genetic host factors play a substantial role in susceptibility to and severity of malaria, which continues to cause at least one million deaths per year. Recently, members of the toll-like receptor (TLR) family have been shown to be involved in recognition of the etiologic organism Plasmodium falciparum: The glycosylphosphatidylinositol anchor induces signaling in host cells via TLR-2 and -4, whereas hemozoin-induced immune activation involves TLR-9. Binding of microbial ligands to the respective TLRs triggers the release of proinflammatory cytokines via the TLR/IL-1 receptor (TIR) domain and may contribute to the host response in malaria, including cytokine induction and fever. In a case-control study among 870 Ghanaian children, we examined the influence of TLR-2,-4, and-9 polymorphisms in susceptibility to severe malaria.TLR-2 variants common in Caucasians and Asians were completely absent. However, we found a rare previously undescribed mutation (Leu658Pro), which impairs signaling via TLR-2. We failed to detect any polymorphisms within the TLR-9 Toll/IL-1 receptor domain. Two frequent TLR-9 promoter polymorphisms did not show a clear association with malaria severity. In contrast, the TLR-4-Asp299Gly variant occurred at a high rate of 17.6% in healthy controls and was even more frequent in severe malaria patients (24.1%,P< 0.05). Likewise,TLR-4-Thr399Ile was seen in 2.4% of healthy children and in 6.2% of patients (P= 0.02).TLR-4-Asp299Gly and TLR-4-Thr399Ile conferred 1.5- and 2.6-fold increased risks of severe malaria, respectively. These findings suggest TLR4-mediated responses to malaria in vivo and TLR-4 polymorphisms to be associated with disease manifestation.

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Metadata

Authors
Mockenhaupt, F. P., Cramer, J. P., Hamann, L., Stegemann, M. S., Eckert, J., Oh, N.-R., Otchwemah, R. N., Dietz, E., Ehrhardt, S., Schröder, N. W. J., Bienzle, U., & Schumann, R. R.
Venue
Proceedings of the National Academy of Sciences
Published
2005-12-21
Volume
103
Issue
1
Pages
177-182
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2172258104
Cited by
320
References
62
FWCI
21.67
Type
journal article
Language
en
Open access
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CoChat. (2026). Citation check: Toll-like receptor (TLR) polymorphisms in African children: Common TLR-4 variants predispose to severe malaria. https://app.cochat.ai/papers/10.1073/pnas.0506803102
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Mockenhaupt, F. P., Cramer, J. P., Hamann, L., Stegemann, M. S., Eckert, J., Oh, N.-R., Otchwemah, R. N., Dietz, E., Ehrhardt, S., Schröder, N. W. J., Bienzle, U., & Schumann, R. R. (2006). Toll-like receptor (TLR) polymorphisms in African children: Common TLR-4 variants predispose to severe malaria. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0506803102

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