Maternal Immune Activation and Autism in Offspring: What Is the Evidence for Causation?
Renee M Gardner1, Martin Brynge1, Hugo Sjöqvist1
1Department of Global Public Health, Karolinska Institutet, Stockholm, Sweden.
Biological Psychiatry
|November 24, 2024
Summary
Maternal inflammation during pregnancy may increase autism risk. However, genetic factors may confound this association, requiring further research into causal links for autism etiology.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- The maternal immune activation hypothesis suggests inflammation during pregnancy contributes to autism risk.
- Autism is highly heritable, but environmental causes remain unclear.
- Maternal conditions like infections, autoimmunity, and obesity are linked to inflammation.
Purpose of the Study:
- To review evidence linking maternal inflammation during pregnancy to autism risk.
- To examine studies on inflammatory markers and autism.
- To assess the confounding role of familial genetic factors.
Main Methods:
- Review of epidemiological and clinical cohort studies.
- Analysis of studies on maternal infections, autoimmunity, and BMI.
- Examination of inflammatory markers in maternal and neonatal samples.
Main Results:
- Associations exist between maternal inflammation and autism risk.
- Familial clustering of autism, autoimmunity, and infections is observed.
- Genetic factors may confound the observed associations.
Conclusions:
- Familial genetic factors pose a significant confounding risk in studies of maternal inflammation and autism.
- Further research is needed to disentangle the causal effects of early-life inflammation on autism development.
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