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Poor school performance in offspring of patients with schizophrenia: what are the mechanisms?
J Jundong1, R Kuja-Halkola, C Hultman
1Department of Epidemiology and Public Health, National University of Singapore, Singapore. g0801793@nus.edu.sg
Insights
Genetic factors, not environment, explain why children of parents with schizophrenia have poorer school performance. Early interventions for these children are recommended.
Area of Science:
- Psychiatry
- Genetics
- Developmental Psychology
Background:
- Children of parents with schizophrenia show lower academic achievement.
- The underlying mechanisms for this association require elucidation.
Purpose of the Study:
- To investigate the mechanisms linking parental schizophrenia to offspring school performance.
- To differentiate between genetic and environmental influences.
Main Methods:
- Utilized Swedish national population registers for 1,439,215 individuals (1988-2006).
- Compared school performance between offspring of schizophrenic and non-schizophrenic parents.
- Analyzed within-family associations, stratifying by genetic and environmental relatedness.
Main Results:
- Offspring of parents with schizophrenia had significantly poorer school performance (-0.31 s.d.).
- Genetic relatedness strongly moderated the association, indicating a genetic influence.
- No significant environmental effects on offspring school performance were detected.
Conclusions:
- Genetic factors are the primary drivers of poorer school performance in offspring of parents with schizophrenia.
- Cognitive deficits associated with schizophrenia may be heritable.
- Suggests the need for early detection and tailored interventions for at-risk children.
Background:
Offspring of patients with schizophrenia exhibit poorer school performance compared with offspring of non-schizophrenic parents. We aimed to elucidate the mechanisms behind this association.
Method:
We linked longitudinal national population registers in Sweden and compared school performance among offspring of schizophrenic parents with offspring of non-schizophrenic parents (1 439 215 individuals with final grades from compulsory school 1988-2006). To investigate the mechanisms, we studied offspring of schizophrenic patients and controls within the same extended families. We investigated genetic effects by stratifying analyses of parent-child associations according to genetic relatedness (half-cousins, full cousins and half-siblings). Environmental effects were investigated by comparing school performance of offspring of schizophrenic fathers and of schizophrenic mothers, respectively, and by stratifying the analyses according to environmental relatedness while controlling genetic relatedness (paternal and maternal half-cousins, paternal and maternal half-siblings).
Results:
Offspring of parents with schizophrenia had poorer overall school performance than unrelated offspring of non-schizophrenic parents (-0.31 s.d.). Variability in genetic relatedness greatly moderated the strength of the within-family association (β=-0.23 within exposure-discordant half-cousins, β=-0.13 within exposure-discordant full cousins, β=0.04 within exposure-discordant half-siblings), while no evidence was found that the environment affected offspring school performance.
Conclusions:
Genetic factors account for poorer school performance in children of parents with schizophrenia. This supports that cognitive deficits found in individuals with schizophrenia and their relatives might be genetically inherited. Early detection of prodromal signs and impaired functioning of offspring of patients with schizophrenia could lead to earlier and better tailored interventions.
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