The role of TLR4 896 A>G and 1196 C>T in susceptibility to infections: a review and meta-analysis of genetic association studies

Toll-like receptor 4 plays a role in pathogen recognition, and common polymorphisms may alter host susceptibility to infectious diseases. To review the association of two common polymorphisms (TLR4 896A>G and TLR4 1196C>T) with infectious diseases. We searched PubMed and EMBASE up to March 201...

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Veröffentlicht in:PloS one 2013-11, Vol.8 (11), p.e81047-e81047
Hauptverfasser: Ziakas, Panayiotis D, Prodromou, Michael L, El Khoury, Joseph, Zintzaras, Elias, Mylonakis, Eleftherios
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creator Ziakas, Panayiotis D
Prodromou, Michael L
El Khoury, Joseph
Zintzaras, Elias
Mylonakis, Eleftherios
description Toll-like receptor 4 plays a role in pathogen recognition, and common polymorphisms may alter host susceptibility to infectious diseases. To review the association of two common polymorphisms (TLR4 896A>G and TLR4 1196C>T) with infectious diseases. We searched PubMed and EMBASE up to March 2013 for pertinent literature in English, and complemented search with references lists of eligible studies. We included all studies that: reported an infectious outcome; had a case-control design and reported the TLR4 896A>G and/or TLR4 1196C>T genotype frequencies; 59 studies fulfilled these criteria and were analyzed. Two authors independently extracted study data. The generalized odds ratio metric (ORG) was used to quantify the impact of TLR4 variants on disease susceptibility. A meta-analysis was undertaken for outcomes reported in >1 study. Eleven of 37 distinct outcomes were significant. TLR4 896 A>G increased risk for all parasitic infections (ORG 1.59; 95%CI 1.05-2.42), malaria (1.31; 95%CI 1.04-1.66), brucellosis (2.66; 95%CI 1.66-4.27), cutaneous leishmaniasis (7.22; 95%CI 1.91-27.29), neurocysticercosis (4.39; 95%CI 2.53-7.61), Streptococcus pyogenes tonsillar disease (2.93; 95%CI 1.24-6.93) , typhoid fever (2.51; 95%CI 1.18-5.34) and adult urinary tract infections (1.98; 95%CI 1.04-3.98), but was protective for leprosy (0.36; 95%CI 0.22-0.60). TLR4 1196 C>T effects were similar to TLR4 896 A>G for brucellosis, cutaneous leishmaniasis, leprosy, typhoid fever and S. pyogenes tonsillar disease, and was protective for bacterial vaginosis in pregnancy (0.55; 95%CI 0.31-0.98) and Haemophilus influenzae tonsillar disease (0.42; 95%CI 0.17-1.00). The majority of significant associations were among predominantly Asian populations and significant associations were rare among European populations. Depending on the type of infection and population, TLR4 polymorphisms are associated with increased, decreased or no difference in infectious disease. This may be due to differential functional expression of TLR4, the co-segregation of TLR4 variants or a favorable inflammatory response.
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To review the association of two common polymorphisms (TLR4 896A&gt;G and TLR4 1196C&gt;T) with infectious diseases. We searched PubMed and EMBASE up to March 2013 for pertinent literature in English, and complemented search with references lists of eligible studies. We included all studies that: reported an infectious outcome; had a case-control design and reported the TLR4 896A&gt;G and/or TLR4 1196C&gt;T genotype frequencies; 59 studies fulfilled these criteria and were analyzed. Two authors independently extracted study data. The generalized odds ratio metric (ORG) was used to quantify the impact of TLR4 variants on disease susceptibility. A meta-analysis was undertaken for outcomes reported in &gt;1 study. Eleven of 37 distinct outcomes were significant. TLR4 896 A&gt;G increased risk for all parasitic infections (ORG 1.59; 95%CI 1.05-2.42), malaria (1.31; 95%CI 1.04-1.66), brucellosis (2.66; 95%CI 1.66-4.27), cutaneous leishmaniasis (7.22; 95%CI 1.91-27.29), neurocysticercosis (4.39; 95%CI 2.53-7.61), Streptococcus pyogenes tonsillar disease (2.93; 95%CI 1.24-6.93) , typhoid fever (2.51; 95%CI 1.18-5.34) and adult urinary tract infections (1.98; 95%CI 1.04-3.98), but was protective for leprosy (0.36; 95%CI 0.22-0.60). TLR4 1196 C&gt;T effects were similar to TLR4 896 A&gt;G for brucellosis, cutaneous leishmaniasis, leprosy, typhoid fever and S. pyogenes tonsillar disease, and was protective for bacterial vaginosis in pregnancy (0.55; 95%CI 0.31-0.98) and Haemophilus influenzae tonsillar disease (0.42; 95%CI 0.17-1.00). The majority of significant associations were among predominantly Asian populations and significant associations were rare among European populations. 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To review the association of two common polymorphisms (TLR4 896A&gt;G and TLR4 1196C&gt;T) with infectious diseases. We searched PubMed and EMBASE up to March 2013 for pertinent literature in English, and complemented search with references lists of eligible studies. We included all studies that: reported an infectious outcome; had a case-control design and reported the TLR4 896A&gt;G and/or TLR4 1196C&gt;T genotype frequencies; 59 studies fulfilled these criteria and were analyzed. Two authors independently extracted study data. The generalized odds ratio metric (ORG) was used to quantify the impact of TLR4 variants on disease susceptibility. A meta-analysis was undertaken for outcomes reported in &gt;1 study. Eleven of 37 distinct outcomes were significant. TLR4 896 A&gt;G increased risk for all parasitic infections (ORG 1.59; 95%CI 1.05-2.42), malaria (1.31; 95%CI 1.04-1.66), brucellosis (2.66; 95%CI 1.66-4.27), cutaneous leishmaniasis (7.22; 95%CI 1.91-27.29), neurocysticercosis (4.39; 95%CI 2.53-7.61), Streptococcus pyogenes tonsillar disease (2.93; 95%CI 1.24-6.93) , typhoid fever (2.51; 95%CI 1.18-5.34) and adult urinary tract infections (1.98; 95%CI 1.04-3.98), but was protective for leprosy (0.36; 95%CI 0.22-0.60). TLR4 1196 C&gt;T effects were similar to TLR4 896 A&gt;G for brucellosis, cutaneous leishmaniasis, leprosy, typhoid fever and S. pyogenes tonsillar disease, and was protective for bacterial vaginosis in pregnancy (0.55; 95%CI 0.31-0.98) and Haemophilus influenzae tonsillar disease (0.42; 95%CI 0.17-1.00). The majority of significant associations were among predominantly Asian populations and significant associations were rare among European populations. Depending on the type of infection and population, TLR4 polymorphisms are associated with increased, decreased or no difference in infectious disease. This may be due to differential functional expression of TLR4, the co-segregation of TLR4 variants or a favorable inflammatory response.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>24282567</pmid><doi>10.1371/journal.pone.0081047</doi><oa>free_for_read</oa></addata></record>
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1932-6203
language eng
recordid cdi_plos_journals_1461719413
source MEDLINE; DOAJ Directory of Open Access Journals; Public Library of Science (PLoS) Journals Open Access; EZB-FREE-00999 freely available EZB journals; PubMed Central; Free Full-Text Journals in Chemistry
subjects Bacteria
Brucellosis
Cutaneous leishmaniasis
Cysticercosis
Data processing
Fever
Genes
Genetic Predisposition to Disease
Genome-Wide Association Study
Gum disease
Health risks
Hospitals
Humans
Immunology
Infection - genetics
Infections
Infectious diseases
Inflammation
Inflammatory response
Leprosy
Lists
Malaria
Medical schools
Meta-analysis
Mutation
Parasitic diseases
Polymorphism, Genetic
Populations
Porphyromonas gingivalis
Pregnancy
Proteins
Streptococcus infections
Studies
TLR4 protein
Toll-Like Receptor 4 - genetics
Toll-like receptors
Tonsil
Tuberculosis
Typhoid
Urinary tract
Vaginosis
Vector-borne diseases
Waterborne diseases
title The role of TLR4 896 A>G and 1196 C>T in susceptibility to infections: a review and meta-analysis of genetic association studies
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