Summary: Children born to mothers who experienced immune disorders during pregnancy, including allergies, asthma, autoimmune diseases, and autoinflammatory syndromes, are more likely to exhibit behavioral and emotional problems. The child’s sex may interact with maternal immune conditions to influence the outcome of ASD symptoms. While maternal immune disorders were associated with emotional and behavioral problems in children on the autism spectrum, there was no association with reduced cognitive function.
Source: UC Davis
Children with autism born to mothers who had immune conditions during their pregnancy are more likely to have behavioral and emotional problems, a UC Davis Health study has found. The study examined maternal immune history as a predictor of symptoms in children with autism.
“We tested the ability of maternal immune history to predict ASD symptoms and the possible role that the sex of the offspring plays,” said Paul Ashwood, professor of microbiology and immunology and faculty member at the UC Davis MIND Institute.
Published Aug. 14 in Translational Psychiatry, the study found that offspring sex may interact with maternal immune conditions to influence outcomes, particularly in terms of a child’s cognition.
Maternal immunity conditions and autism
Maternal immune conditions are caused by a dysfunction of the mother’s immune system. They include allergies, asthma, autoimmune diseases, autoinflammatory syndromes and immunological deficiency syndromes. Previous studies have shown that maternal immune conditions are more prevalent in mothers of children with autism spectrum disorder (ASD).
The researchers enrolled 363 mothers and their children (252 males and 111 females) from the Autism Phenome Project (APP) and Girls with Autism Imaging of Neurodevelopment (GAIN) study at the UC Davis MIND Institute. The median age of the children was three years.
The researchers measured the children’s autism severity and assessed a set of behavioral and emotional problems such as aggression and anxiety. They also measured the children’s development and cognitive functioning.
The study found that around 27% of the mothers had immune conditions during their pregnancy. Of these mothers, 64% reported a history of asthma, the most common immune condition. Other frequent conditions included Hashimoto’s thyroiditis (hypothyroidism), Raynaud’s disease (blood circulation disease), alopecia (hair loss), psoriasis (skin disease) and rheumatoid arthritis (joint tissue inflammation).
The study also found that maternal immune conditions are associated with increased behavioral and emotional problems but not reduced cognitive functioning in children with autism.
Does the sex of the offspring interact with the influence of maternal immune conditions on autism symptoms?
According to the Centers for Disease Control and Prevention (CDC), ASD is four times more common among boys than among girls.
“Our study explored whether offspring sex interacts with the presence of maternal immune conditions to influence behavioral outcomes in children,” said Ashwood. “Maternal immune conditions may be one environmental factor which contributes to the higher male prevalence seen in ASD.”
The study found that a history of maternal immune conditions was more common in male children with ASD (31%) compared to female (18%). Specifically, asthma was twice as common in mothers of male children with ASD than in mothers of female children with ASD.
The study also showed that in cases of ASD where maternal immune conditions are present, female offspring are less likely to be susceptible to adverse cognitive outcomes in response to maternal inflammation than male offspring.
“This critical finding links offspring sex and maternal immune conditions to autism,” said Ashwood. “It provides more evidence that male offspring are at higher risk of adverse outcomes due to maternal immunity activation compared to female offspring.”
Future studies would include identifying the type, severity and gestational timing of immune conditions, and then examining offspring outcomes over time.
Co-authors on this study are Brianna Heath, Christine Nordahl and Sally Rogers in the department of psychiatry at UC Davis and at the UC Davis MIND Institute, Destanie Rose in the department of medical microbiology and immunology and at the UC Davis MIND Institute, Shrujna Patel, Russell Dale and Adam Guastella in the Children’s Hospital Westmead Clinical School at the University of Sydney.
Funding: Funding for this study was provided by the National Institutes of Health (RO1MH118209, RO1HD090214, R21MH116383, R21ES025560; RO1MH104438), Grace Gardner Johnson and Jane B. Johnson, Autism Speaks Foundation, Autism Research Institute, the UC Davis Clinical and Translational Science Center (CTSC) Pilot Translational and Clinical Studies Program, a Child/Lifespan Health Award. This project was also supported by the UC Davis MIND Institute Intellectual and Developmental Disabilities Research Center (IDDRC) (U54HD079125).
About this autism research article
Source: UC Davis Contacts: Nadine Yehya – UC Davis Image Source: The image is in the public domain.
Maternal immune conditions are increased in males with autism spectrum disorders and are associated with behavioural and emotional but not cognitive co-morbidity
Epidemiological and animal research shows that maternal immune activation increases the risk of autism spectrum disorders (ASD) in offspring. Emerging evidence suggests that maternal immune conditions may play a role in the phenotypic expression of neurodevelopmental difficulties in children with ASD and this may be moderated by offspring sex. This study aimed to investigate whether maternal immune conditions were associated with increased severity of adverse neurodevelopmental outcomes in children with ASD. Maternal immune conditions were examined as predictors of ASD severity, behavioural and emotional well-being, and cognitive functioning in a cohort of 363 children with ASD (n = 363; 252 males, 111 females; median age 3.07 [interquartile range 2.64–3.36 years]). We also explored whether these outcomes varied between male and female children. Results showed that maternal asthma was the most common immune condition reported in mothers of children with ASD. A history of maternal immune conditions (p = 0.009) was more common in male children with ASD, compared to female children. Maternal immune conditions were associated with increased behavioural and emotional problems in male and female children. By contrast, maternal immune conditions were not associated with decreased cognitive function. The findings demonstrate that MIA may influence the expression of symptoms in children with ASD and outcomes may vary between males and females.