Abstract
Polymorphisms in toll-like receptors (TLRs) have been reported to increase susceptibility for some diseases. TLR-2 gene polymorphisms in Turkish children with recurrent respiratory tract infections and without well-known humoral immunodeficiencies were examined. The study consisted of 52 children with recurrent infections (study group) and 91 healthy children with a maximum of two infections in a year (control group). Recurrent infection was defined as the presence of at least six febrile bacterial infection episodes in a year. Not only TLR-2 gene polymorphisms but also immunoglobulins (IgG, IgM, IgA), IgG subsets (G1, G2, G3), and specific antibody levels (anti-tetanus and anti-hemophilus influenza) were determined to exclude humoral immunodeficiencies. The Arg753Gln and Arg677Trp polymorphisms were genotyped by polymerase chain reaction restriction fragment length polymorphism. The Arg753Arg genotype was significantly decreased in the study group compared to the control (P < 0.05). Children with recurrent infections were also found to be more frequently Arg753Gln heterozygous (P < 0.05), and their Gln allele distribution was higher than that of the control subjects (23% vs. 4.9%; P < 0.001). In contrast to these results, we did not detect any case with Arg677Trp polymorphism in both groups. These results have indicated that there is a strong significant relationship between susceptibility to recurrent bacterial infections and Arg753Gln polymorphism of the TLR-2 gene.
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Kutukculer, N., Yeniay, B.S., Aksu, G. et al. Arg753Gln Polymorphism of the Human Toll-like Receptor-2 Gene in Children with Recurrent Febrile Infections. Biochem Genet 45, 507–514 (2007). https://doi.org/10.1007/s10528-007-9091-0
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DOI: https://doi.org/10.1007/s10528-007-9091-0