Investigation of candidate genes for functional psychoses: case-control study with mothers and children (population of high risk) / Investigação de genes candidatos para psicoses funcionais: estudo caso-controle com mães e crianças (população de alto risco)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The high-risk studies involving offspring of parents who developed psychoses provide the opportunity to clarify quantitative trait loci that may underlie liability traits. Until now, the research about the influence of genetic vulnerability and environmental factors on child behavior is scarce and inconclusive. Objective: In this research a review of the findings of previous HR studies in functional psychoses, the analyze polymorphisms distribution of the genes DRD3 (Ser9Gly - rs6280), DAT1 (VNTR-Variable Number of Tandem Repeats - NM_001044.3), BDNF (Val66Metrs6265) and serotonin transporter (5HTTLPR - X76753.2) among functional psychoses women and their offspring and polymorphisms distribution in four clinical characteristics among the offspring (Anxious/Depressed and Withdrawn/Depressed syndromes from CBCL, school delay and low intelligence coefficient) was done. Methods: Outpatient mothers with schizophrenia and bipolar referred from the Psychiatric Institute in Sao Paulo and outpatient mothers referred from the Gynecologic Clinic of the same university. For each mother, one offspring was chosen and stratified by gender and age (6-18 y.o.). Blinded interviewers applied the SCID (Structured Clinical Interview for DSM-IV) and Global Assessment of Functioning Scale (GAF) to the mothers, the Child Behavior Checklist (CBCL) (Achenbach, 1983) and WASI (Wechsler Abbreviated Scale of Intelligence) to the children. Socioeconomic status was evaluated based on a Brazilian standardized instrument used in population studies (ANEP). The polymorphisms distribution among mothers was done comparing the diagnoses (Controls, Bipolar Disorder and Schizophrenia). The analysis of the offspring characteristics was initially done according to mother s diagnosis and later according to likely clinical syndromes these children showed. Data analysis was performed with the Statistical Program for Social Sciences (SPSS - 15.0). The groups were compared according to characteristics using Pearson s Chi-square or Fisher s Exact Test adopting significance value of 0.05. RESULTS: 167 mothers (58 with schizophrenia, 47 with bipolar disorder and 62 controls) participated. No significant difference was observed in the allelic and genotype frequencies in the polymorphisms of the Ser9Gly, VNTR- DAT1, Val66Met- and 5HTTLPR. There was some difference in Anxious/Depressed and Withdrawn/Depressed syndromes frequency in the children from bipolar group, but without association with the polymorphism studied. A tendency of association was detected between homozygosis ser9gly DRD3 and mental impairment (p= 0,09), and an association between homozygosis 9* and 10* of DAT1-VNTR (p=0,03) and Anxious/Depressed in children, regardless of mother s diagnosis. CONCLUSION: Despite of the sample size limitation, our results supported the methodological feasibility of a high-risk study. Hereafter it intends to explore the data found by increasing the sample and introducing new variables from the follow up.

ASSUNTO(S)

psychotic disorders transtornos psicóticos grupos de risco risk groups esquizofrenia/genética bipolar disorder/genetics seguimentos schizophrenia/genetics transtorno bipolar/genética genética follow-up studies genetics

ACESSO AO ARTIGO

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