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Report for Mutation R677W

Developed by Shray Alag, 2020-2021.
SNP Clinical Trial Gene

There is one clinical trial.

Clinical Trials


1 Relationship Between TLR2 Polymorphism and Pulmonary Tuberculosis

Infection with Mycobacterium tuberculosis remains at epidemic levels globally. Innate and adaptive immune responses evolve as protective mechanisms against mycobacterial infection in humans. Toll-like receptors (TLRs) are transmembrane proteins characterized by an extracellular leucine-rich domain that participates in ligand recognition and an intracellular tail. TLRs are the first defense system to detect potential pathogens, initiate immune responses and form the crucial link between innate and adaptive immune systems. Stimulation of TLR initiates a signaling cascade that involves a number of proteins, such as MyD88 and IL-1 receptor-associated kinase. This signal cascade leads to NF-κB activation, which induce the secretion of pro-inflammatory cytokines. TLR2 is a family of TLR family and has been reported to be the principle mediator of macrophage activation in response to mycobacterium. Growing amounts of data suggest that the ability of certain individuals to respond properly to TLR ligands may be impaired by single nucleotide polymorphisms (SNPs) within TLR genes, resulting in an altered susceptibility to, or course of, infectious disease. The genetic polymorphism of TLR2 (arginine to glutamine substitution at residue 753 (Arg753Gln)) has been associated with a negative influence on TLR2 function, which may, in turn, determine the innate host response to mycobacteria. In addition, another polymorphism (Arg677Trp) of the TLR2 was reported to be associated with susceptibility to tuberculosis in Tunisian patients. Moreover, in Mycobacterium leprosy patients with TLR2 mutation (Arg677Trp), production of IL-2, IL-12, IFN-gamma, and TNF-alpha by M. leprae-stimulated peripheral blood mononuclear cell were decreased compared with that in groups with wild-type TLR2. To date, there have been no studies of the association of SNPs of TLR2 with cytokine profiles and clinical outcomes on M. tuberculosis. We hypothesize that polymorphisms in the TLR2 are associated with : 1. increased prevalence of active pulmonary TB infection, 2. altered levels of pro-inflammatory and anti-inflammatory cytokines in serum, 3. clinical outcomes and presentations. We thus design a prospective case-control study to test this hypothesis. The frequency of TLR2 polymorphisms in both pulmonary TB patients and healthy controls will be determined by polymerase chain reaction-restriction fragment length polymorphism. Serial serum levels of IL-12, IFN-γ, and IL-10 in pulmonary TB patients with or without TLR2 polymorphisms will be measured by enzyme linked immunosorbent assay. Relationships between TLR2 polymorphisms and serum cytokines dynamics or clinical outcomes will be analyzed.

NCT00772408
Conditions
  1. Pulmonary Tuberculosis
  2. Genetic Variants of Host
  3. Immune Response of Host
MeSH:Tuberculosis Tuberculosis, Pulmonary

In addition, another polymorphism (Arg677Trp) of the TLR2 was reported to be associated with susceptibility to tuberculosis in Tunisian patients. --- Arg677Trp ---

Moreover, in Mycobacterium leprosy patients with TLR2 mutation (Arg677Trp), production of IL-2, IL-12, IFN-gamma, and TNF-alpha by M. leprae-stimulated peripheral blood mononuclear cell were decreased compared with that in groups with wild-type TLR2. --- Arg677Trp ---

In addition, another polymorphism (Arg677Trp) of the TLR2 was reported to be associated with susceptibility to tuberculosis in Tunisian patients (11), as well as lepromatous leprosy(12). --- Arg677Trp ---

In leprosy patients with TLR2 mutation (Arg677Trp), production of IL-2, IL-12, IFN-gamma, and TNF-alpha by M. leprae-stimulated peripheral blood mononuclear cell were decreased compared with that in groups with wild-type TLR2. --- Arg677Trp ---

Primary Outcomes

Measure: susceptibility of pulmonary tuberculosis

Time: At diagnosis

Secondary Outcomes

Measure: clinical presentation of pulmonary TB

Time: at diagnosis


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