Abstract
There is a need to consider paternal contributions to autism spectrum disorder (ASD) more strongly. Autism etiology is complex, and heritability is not explained by genetics alone. Understanding paternal gametic epigenetic contributions to autism could help fill this knowledge gap. In the present study, we explored whether paternal autistic traits, and the sperm epigenome, were associated with autistic traits in children at 36 months enrolled in the Early Autism Risk Longitudinal Investigation (EARLI) cohort. EARLI is a pregnancy cohort that recruited and enrolled pregnant women in the first half of pregnancy who already had a child with ASD. After maternal enrollment, EARLI fathers were approached and asked to provide a semen specimen. Participants were included in the present study if they had genotyping, sperm methylation data, and Social Responsiveness Scale (SRS) score data available. Using the CHARM array, we performed genome-scale methylation analyses on DNA from semen samples contributed by EARLI fathers. The SRS—a 65-item questionnaire measuring social communication deficits on a quantitative scale—was used to evaluate autistic traits in EARLI fathers (n = 45) and children (n = 31). We identified 94 significant child SRS-associated differentially methylated regions (DMRs), and 14 significant paternal SRS-associated DMRs (fwer p < 0.05). Many child SRS-associated DMRs were annotated to genes implicated in ASD and neurodevelopment. Six DMRs overlapped across the two outcomes (fwer p < 0.1), and, 16 DMRs overlapped with previous child autistic trait findings at 12 months of age (fwer p < 0.05). Child SRS-associated DMRs contained CpG sites independently found to be differentially methylated in postmortem brains of individuals with and without autism. These findings suggest paternal germline methylation is associated with autistic traits in 3-year-old offspring. These prospective results for autism-associated traits, in a cohort with a family history of ASD, highlight the potential importance of sperm epigenetic mechanisms in autism.
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Data availability
The raw methylation data analyzed in the current study was previously uploaded to the National Database for Autism Research (NDAR) study 377 and is available at the following link: https://nda.nih.gov/study.html?id=377. Additional data is available from the corresponding author upon reasonable request.
Code availability
Code for performing the above analyses is available from the authors upon request.
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Acknowledgements
We would like to thank Rakel Tryggvadottir, Birna Berndsen, Roxann Ashworth, and the Johns Hopkins SNP Center at the Genome Resource Core Facility (GRCF) for processing the lab samples. This work was supported by R01ES017646 (Feinberg/Fallin), R01ES016443 (Newschaffer), R24ES030893 (Fallin), R01ES023780 (Volk), R01ES023780-04S01 (Volk), Autism Speaks grant no. 7785 (Volk).
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Laboratory studies were performed by JIF. Statistical analyses were performed by JIF and RS with assistance from APF, HEV, CLA, and MDF. EARLI cohort P.I.s were CJN, IHP, LAC, and MDF. The paper was written by JIF, RS, APF, and HEV. The overall design of the study was done by APF and HEV with assistance from MDF and CLA. JIF and RS are considered co-equal first authors, and APF and HV are considered co-equal corresponding authors.
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Dr CL-A reports receiving consulting fees from the University of Iowa for providing expertize on autism spectrum disorder epigenetics outside of this work. The work described here is the subject of U.S. patent application 63/315,000 from Johns Hopkins University.
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Feinberg, J.I., Schrott, R., Ladd-Acosta, C. et al. Epigenetic changes in sperm are associated with paternal and child quantitative autistic traits in an autism-enriched cohort. Mol Psychiatry 29, 43–53 (2024). https://doi.org/10.1038/s41380-023-02046-7
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DOI: https://doi.org/10.1038/s41380-023-02046-7
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