Evaluating the interrelations between the autism polygenic score and psychiatric family history in risk for autism.
Autism gene score and family mental-health history give mostly separate warnings—use both to spot high-risk kids.
01Research in Context
What this study did
Schendel et al. (2022) looked at 31 514 Danish births. They asked two questions: does a high autism polygenic score raise risk, and does a family history of mental illness raise risk?
They kept score on both measures, then ran the numbers together. The goal was to see if the two clues overlap or give separate warnings.
What they found
Each clue stayed strong when the other was in the model. The odds ratios barely moved after mutual adjustment.
In plain words, gene risk and family history each tell you something new. Using just one leaves information on the table.
How this fits with other research
Bravo-Muñoz et al. (2025) pooled many studies and found that mom’s gestational diabetes or PCOS also raise autism odds. These prenatal factors sit in a different bucket from DNA scores and family history, so clinicians now have three separate buckets to watch.
Zhao et al. (2024) and Arcebido et al. (2025) show the flip side: only about one in three US families ever hear that genetic testing exists. Diana’s data say the tests give added value, yet the service-delivery papers reveal a big implementation gap.
Pereira et al. (2021) used the same Nordic registries and found birth spacing near 35 months carries the lowest autism risk. Like Diana, they turned a large birth cohort into risk math, strengthening trust in registry-based numbers.
Why it matters
You can’t change genes or family history, but you can use both to flag babies who need close developmental watch. When you write an assessment plan, list polygenic score and psychiatric family history as two separate line items. Don’t drop one because you have the other.
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02At a glance
03Original abstract
Psychiatric family history or a high autism polygenic risk score (PRS) have been separately linked to autism spectrum disorder (ASD) risk. The study aimed to simultaneously consider psychiatric family history and individual autism genetic liability (PRS) in autism risk. We performed a case-control study of all Denmark singleton births, May 1981-December 2005, in Denmark at their first birthday and a known mother. Cases were diagnosed with ASD before 2013 and controls comprised a random sample of 30,000 births without ASD, excluding persons with non-Denmark-born parents, missing ASD PRS, non-European ancestry. Adjusted odds ratios (aOR) were estimated for ASD by PRS decile and by psychiatric history in parents or full siblings (8 mutually-exclusive categories) using logistic regression. Adjusted ASD PRS z-score least-squares means were estimated by psychiatric family history category. ASD risk (11,339 ASD cases; 20,175 controls) from ASD PRS was not substantially altered after accounting for psychiatric family history (e.g., ASD PRS 10th decile aOR: 2.35 (95% CI 2.11-2.63) before vs 2.11 (95% CI 1.91-2.40) after adjustment) nor from psychiatric family history after accounting for ASD PRS (e.g., ASD family history aOR: 6.73 (95% CI 5.89-7.68) before vs 6.32 (95% CI 5.53-7.22) after adjustment). ASD risk from ASD PRS varied slightly by psychiatric family history. While ASD risk from psychiatric family history was not accounted for by ASD PRS and vice versa, risk overlap between the two factors will likely increase as measures of genetic risk improve. The two factors are best viewed as complementary measures of family-based autism risk. LAY SUMMARY: Autism risk from a history of mental disorders in the immediate family was not explained by a measure of individual genetic risk (autism polygenic risk score) and vice versa. That is, genetic risk did not appear to overlap family history risk. As genetic measures for autism improve then the overlap in autism risk from family history versus genetic factors will likely increase, but further study may be needed to fully determine the components of risk and how they are inter-related between these key family factors. Meanwhile, the two factors may be best viewed as complementary measures of autism family-based risk.
Autism research : official journal of the International Society for Autism Research, 2022 · doi:10.1101/2020.08.24.265280