TGF-β1 polymorphism in American tegumentary leishmaniasis in a Southern Brazilian population

Abstract INTRODUCTION: Genetic polymorphisms define the cytokine production leading to susceptibility or resistance to diseases. We studied the cytokine polymorphism in the development of tegumentary leishmaniasis (TL). METHODS: Genotyping of TNF-α, TGF-β1, IFN-γ, IL-6, and IL-10 were performed by polymerase chain reaction assay. RESULTS: G and C alleles of TGF- β1 (codon 25) were the most common in controls and patients, respectively. G/G was the most frequent genotype in controls, and G/C and C/C in patients. CONCLUSIONS: G/G genotype of codon 25 in TGF-β1 appeared to confer resistance, and G/C and C/C genotypes, susceptibility to TL in this population.