IL10A genotypic association with decreased IL-10 circulating levels in malaria infected individuals from endemic area of the Brazilian Amazon

• Published in: Malaria journal 2015-01, Vol.14 (1), p.30-30, Article 30
• Main Authors: Pereira, Virginia A, Sánchez-Arcila, Juan C, Teva, Antonio, Perce-da-Silva, Daiana S, Vasconcelos, Mariana P A, Lima, Cleoni A M, Aprígio, Cesarino J L, Rodrigues-da-Silva, Rodrigo N, Santos, Davi O, Banic, Dalma M, Bonecini-Almeida, Maria G, Lima-Júnior, Josué C, Oliveira-Ferreira, Joseli
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Aged; Brazil - epidemiology; Child; Child, Preschool; Cytokines - blood; Cytokines - genetics; Endemic Diseases; Female; Gene Frequency; Haplotypes; Humans; Interleukin-10 - blood; Interleukin-10 - genetics; Linkage Disequilibrium; Malaria - epidemiology; Malaria - genetics; Male; Middle Aged; Parasitemia - epidemiology; Parasitemia - genetics; Polymorphism, Single Nucleotide - genetics; Young Adult
• ISSN: 1475-2875; 1475-2875
• DOI: 10.1186/s12936-015-0548-z

Cytokines play an important role in human immune responses to malaria and variation in their production may influence the course of infection and determine the outcome of the disease. The differential production of cytokines has been linked to single nucleotide polymorphisms in gene promoter regions, signal sequences, and gene introns. Although some polymorphisms play significant roles in susceptibility to malaria, gene polymorphism studies in Brazil are scarce. A population of 267 individuals from Brazilian Amazon exposed to malaria was genotyped for five single nucleotide polymorphisms (SNPs), IFNG + 874 T/A, IL10A-1082G/A, IL10A-592A/C, IL10A-819 T/C and NOS2A-954G/C. Specific DNA fragments were amplified by polymerase chain reaction, allowing the detection of the polymorphism genotypes. The polymorphisms IL10A-592A/C and IL10A-819 T/C were estimated by a single analysis due to the complete linkage disequilibrium between the two SNPs with D' = 0.99. Plasma was used to measure the levels of IFN-γ and IL-10 cytokines by Luminex and nitrogen radicals by Griess reaction. No differences were observed in genotype and allelic frequency of IFNG + 874 T/A and NOS2A-954G/C between positive and negative subjects for malaria infection. Interesting, the genotype NOS2A-954C/C was not identified in the study population. Significant differences were found in IL10A-592A/C and IL10A-819 T/C genotypes distribution, carriers of IL10A -592A/-819 T alleles (genotypes AA/TT + AC/TC) were more frequent among subjects with malaria than in negative subjects that presented a higher frequency of the variant C allele (p