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Department of Medical Microbiology, University of Edinburgh Medical School, Edinburgh, EH8 9AG Scotland, United Kingdom

Address correspondence to I.R. Poxton, Medical Microbiology, University of Edinburgh Medical School, Teviot Place, Edinburgh, EH8 9AG Scotland, UK. Phone: 44-131-650-3128; Fax: 44-131-650-3128; E-mail: i.r.poxton{at}ed.ac.uk

Toll-like receptor 4 (TLR4)-mediated recognition of lipopolysaccharide (LPS) is required for efficient recognition of Gram-negative bacterial infections. Two commonly occurring mutations in the human TLR4 gene (Asp299Gly and Thr399Ile) have recently been shown to be associated with blunted physiological responses to inhaled LPS, and with increased risk of Gram-negative bacteraemia in sepsis patients and reduced risk of atherosclerosis in an Italian population. Here we show that monocytes from individuals heterozygous for both mutations in the TLR4 gene exhibit no deficit in recognition of LPS of Escherichia coli, Neisseria meningitidis, Bacteroides fragilis, Yersinia pestis, Chlamydia trachomatis, Porphyromonas gingivalis, or Pseudomonas aeruginosa. We propose that the relatively high frequency of these mutations in the Caucasian population may reflect modified responses of carriers to alternative TLR4 agonists.

Key Words: lipopolysaccharides • Toll-like receptor 4 • single nucleotide polymorphism • monocytes • innate immunity

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