IL-10 (-1082 G/A) polymorphism in Bataknese with schizophrenia

Abstract

Objectives: Three biallelic polymorphisms at the promoter region of the interleukin-10 (IL-10) gene have been associated with susceptibility to schizophrenia. The aim of this case-control study was to investigate the association between IL-10 (-1082) G/A gene polymorphisms and schizophrenia among Bataknese, a native tribe inhabiting the North Sumatera province in Indonesia.

Methods: A total of 194 unrelated participants (n = 97 for each case and control groups) participated in this study. Polymerase chain reaction restriction fragment length polymorphism molecular genotyping was conducted to assess the genotype and allele distribution of IL-10 (-1082 G/A).

Results: Allele variations indicated that the dominant allele in the Batak tribe was allele A, whereas homozygous GG genotypes were not found in either group. The A allele and AA genotype were found to be risk factors for developing schizophrenia (OR = 2.26, 95% CI = 1.1825-4.3559 and OR = 2.56, 95% CI = 1.280-5.152, respectively).

Conclusion: Only the A allele and AA genotype of the IL-10 gene polymorphism at -1082 G/A contribute to schizophrenia susceptibility in Bataknese.

Keywords: Batak; Genetic polymorphisms; Interleukin-10; Neuroimmunology; Schizophrenia.

Figure 1

Representative gel electrophoresis showing the PCR products of IL-10 polymorphism at −1082 G/A using 25 bp ladder; M is molecular marker, lane 1 represents homozygous AA subject, and lane 2 represents heterozygous GA subjects. G allele cuts with restriction enzyme MnII, generating 106 bp (lane 2), while A allele does not cut (lane 1). Homozygote GG subject was not found in any subjects in this study.