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Functional Polymorphism in the Interleukin-6 and Interleukin-10 Genes in Patients with Paranoid Schizophrenia —A Case-Control Study

Abstract

Schizophrenia is a multifactorial disease with changes in immunological system. Such changes are the result of cytokine-level disturbances connected with cytokine gene polymorphisms. However, research about cytokine gene polymorphisms in schizophrenia has been surprisingly limited and ambiguous. The aim of the study was to identify whether polymorphisms of interleukin (IL)-6 and IL-10 are risk factors for the development of paranoid schizophrenia in case-control study. IL-6 (−174G/C; rs 1800795) and IL-10 (−1082G/A; rs 1800896) promoter polymorphisms in patients with paranoid schizophrenia and healthy individuals were genotyped using polymerase chain reaction–restriction fragment length polymorphism method. Differences in IL-6 and IL-10 promoter haplotypes may play an important role in determining the transcription level for IL-6 and IL-10 genes in schizophrenic patients. The presence of allele C at position −174 of IL-6 promoter sequence may correlate with increasing risk of paranoid schizophrenia in the Polish population, but research on a broadened group of people is needed. The presence of allele G at position −1082 of IL-10 promoter sequence correlates with increasing risk of paranoid schizophrenia in the Polish population. The coexistence of genotype GG at position −1082 of IL-10 promoter sequence and genotype GC at position −174 of IL-6 promoter sequence correlates with increasing risk of paranoid schizophrenia in the Polish population.

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Acknowledgement

We would like to thank Dr. Krzysztof Kucia for qualifying patients for the research and for collecting blood samples.

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Correspondence to Monika Paul-Samojedny.

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Paul-Samojedny, M., Kowalczyk, M., Suchanek, R. et al. Functional Polymorphism in the Interleukin-6 and Interleukin-10 Genes in Patients with Paranoid Schizophrenia —A Case-Control Study. J Mol Neurosci 42, 112–119 (2010). https://doi.org/10.1007/s12031-010-9365-6

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  • DOI: https://doi.org/10.1007/s12031-010-9365-6

Keywords

  • Interleukin-6
  • Interleukin-10
  • Paranoid schizophrenia
  • Polymorphism