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manic-depressive disorders

Infectious and immunogenetic factors in bipolar disorder

January 3, 2017
Oliveira, J., Oliveira-Maia, A. J., Tamouza, R., Brown, A. S., Leboyer, M.
Acta Psychiatrica Scandinavica 2017; 136:409-423
Click for abstract
Objective: Despite the evidence supporting the association between infection and bipolar disorder (BD), the genetic vulnerability that mediates its effects has yet to be clarified. A genetic origin for the immune imbalance observed in BD, possibly involved in the mechanisms of pathogen escape, has, however, been suggested in recent studies. Method: Here, we present a critical review based on a systematic literature search of articles published until December 2016 on the association between BD and infectious/immunogenetic factors. Results: We provide evidence suggesting that infectious insults could act as triggers of maladaptive immune responses in BD and that immunogenetic vulnerability may amplify the effects of such environmental risk factors, increasing susceptibility to subsequent environmental encounters. Quality of evidence was generally impaired by scarce attempt of replication, small sample sizes and lack of high-quality environmental measures. Conclusion: Infection has emerged as a potential preventable cause of morbidity in BD, urging the need to better investigate components of the host-pathogen interaction in patients and at-risk subjects, and thus opening the way to novel therapeutic opportunities.

Tagged: antagonist gene polymorphism, bipolar disorder, borna-disease virus, immunogenetics, infection, inflammation, korean population, manic-depressive disorders, mood disorders, necrosis-factor-alpha, population-based cohort, retrovirus-w family, severe mental illness, toxoplasma gondii infection

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