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Background: Antiretroviral treatment (ART) has reduced morbidity and mortality due to AIDS. However, treatment options can be impaired by the development of antiretroviral drug resistance. Resistant virus strains can be transmitted to new hosts and, subsequently, can lead to antiretroviral treatment failure. Methods: Th A systematic review of articles on resistance to antiretroviral therapy for HIV-infected individuals, published from January 1, 2014 to June 16, 2014, on SCOPUS and PUBMED databases wascarried out. Search terms were "AIDS" (Medical Subject Headings [MeSH]), "HIV" (MeSH), "treatment" (keyword), "resistance" (keyword) and "antiretroviral therapy" (MeSH). Of the 118 retrieved studies, 24 met the eligibility criteria. Results: The main classes of antiretroviral drugs are Non Nucleoside Reverse Transcriptase Inhibitors (NNRTIs), Nucleoside Reverse Transcriptase Inhibitors (NRTIs), and Protease Inhibitors (PIs). Antiretroviral treatment selects for drug resistance. Resistant strains become prevalent in the population and are transmitted to new patients. Discussion: A higher prevalence of certain mutations are present and characterize resistant strains that are prevalent in the population making it more difficult to treat these infected individuals. Poor compliance with antiretroviral therapy increases the potential for developing these and other resistant strains.

Background: Schizophrenia is a severe psychiatric disorder with a complex genetic factor determining its disease onset. Nevertheless, it is not clear in this mental disorder. Objective: To conduct a systematic review of articles regarding the genetic markers and mutations in schizophrenia. Methods: A systematic review of articles on genetic markers and mutations in schizophrenia, published from January 1, 2011, to September 7, 2015, on SCOPUS database was carried out. Search terms were "Genetic markers", "Mutation", and "Schizophrenia". Results: Of the 527 retrieved studies, 31 met the eligibility criteria. Genetic polymorphism, Immune-associated genes, TCF4 and ZNF804A association with microRNA, Neuregulin gene, Chromosome 13q32 and 11p15.4, genes involved in glutamatergic via schizophrenia and brain structure, appeared to be associated with the origin of schizophrenia. Conclusion: Some studies show genes involved in several pathways leading to the disease pathogenesis such as that one related with the dopaminergic and immune system, or rare alleles. Some genes present no involvement in the etiology of this mental disorder. These findings clarify the genetic complexity of schizophrenia and affirm that together, the genes have an overall effect greater than the sum of the individual effect of each gene. KeywordsSchizophrenia, Genetic Markers, Mutations, Systematic Review How to cite this paper: Cardoso, M.A.B.S., do Nascimento, T