Therefore, the aim of our work was to examine the association of the T102C polymorphism of the 5-HT2A gene with schizophrenia diagnosis, psychopathological characteristics, and history of suicidal behavior in a well-characterized sample of Brazilian schizophrenic inpatients. Material and methods Subjects A total of 214 unrelated subjects were enrolled after a full explanation of this study and obtaining of informed consent. This study was approved by the University Ethics Committee. One hundred and twentynine schizophrenic patients, consecutively Inhibitors,research,lifescience,medical admitted to Hospital Santa
Maria, Belo Horizonte, meeting the Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV) diagnostic criteria based on a structured interview (MINI-PLUS),7,8 without any other current comorbid axis I disorders, were enrolled in this study Healthy controls were students and hospital staff members (n=85), all free of psychiatric and medical illness. Psychopathology Inhibitors,research,lifescience,medical The psychiatric symptoms of the patients were rated using the Brief Psychiatric
Rating Scale (BPRS),9 which has been validated in Brazil.10 The principal component analyses of the symptoms assessed by the BPRS were also performed, and four factors emerged: delusion dimension (DD, items 4 + 12 + 15), hebephrenic Inhibitors,research,lifescience,medical dimension (DH, items 3 + 13 + 16), paranoid dimension (DP, items 10 + 11 + 14) and anxiety-depressive dimension (DA, items 2 + 5 + 9), as Inhibitors,research,lifescience,medical previously described.5 Suicide history The suicide history
was assessed using a semistructured interview,5 a review of medical records, and a supplementary interview with at least one close relative in order to collect information about suicidal behavior in probands. The Lethality Rating Scale (LRS)11 was used to measure the degree of medical damage of the most lethal lifetime suicide Inhibitors,research,lifescience,medical attempt. We used an anchored modified version12 scored 0 to 8 and, as previously described, a lethality score of three or greater as a cutoff point of three in the LRS scores.5 The suicide attempt methods, 4-Aminobutyrate aminotransferase defined by the most lethal lifetime suicide attempt, were classified as nonviolent (drug overdose) or violent (cutting beyond a superficial scratch, jumping from a height, shooting, hanging) as defined elsewhere.13 Genotyping Deoxyribonucleic acid (DNA) was this website isolated from lymphocytes using routine procedures. Polymerase chain reaction (PCR) amplification of the HT2A/T102C region containing the polymorphic site produced a 342 base-pair (bp) fragment. This was digested with the restriction enzyme HpalLThe uncut product corresponded to the 102T allele. Digested products with 216bp and 126 bp corresponded to the 102C allele. Statistical analyses A Chi-square test was used for categorical data and an analysis of variance (ANOVA) for continuous variables.