Universal Genetic Foundations of Autism Identified Across Ancestries

A recent study published in *Nature Medicine* reveals that the genetic traits associated with autism risk are consistent across diverse ancestral backgrounds. Conducted by the Genomics of Autism in Latin American Ancestries Consortium, the research involved analyzing the DNA of over 15,000 individuals from North, Central, and South America, including approximately 4,700 diagnosed with autism. The study aimed to determine whether genetic risk factors for autism vary by ancestry, focusing particularly on Latin American populations, which encompass Indigenous American, African, and European heritages.

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The researchers identified 35 specific genes linked to autism within the Latin American cohort. Notably, there was a significant overlap between these genes and those previously identified in European populations. The study found that the biological pathways affected by these genes, such as neuronal communication and cytoskeletal regulation, were consistent across both groups. This suggests that the underlying biological mechanisms contributing to autism are fundamentally the same, irrespective of ethnic background.

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Despite the findings, the study highlighted limitations in current genetic testing practices. Standard clinical software flagged fewer mutations as definitively harmful in Latin American individuals compared to their European counterparts. This discrepancy arises because existing diagnostic tools are primarily based on European genetic data, leading to inconclusive results for non-European individuals. The study emphasizes the need for more inclusive genetic databases to improve diagnostic accuracy and reduce health disparities in autism and related conditions.

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Joseph D. Buxbaum, director of the Seaver Autism Center for Research and Treatment at Mount Sinai, stated, “Our results indicate that the core genetic architecture of autism is shared across ancestries. This suggests that the biology underlying autism is universal and reinforces the importance of ensuring that diverse populations are represented in genetic research.” He further noted that expanding genomic research in underrepresented populations is essential for advancing precision medicine.

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While the study presents significant findings, some experts caution that the reliance on specific genetic regions may overlook other potential risk factors. Critics argue that a broader genomic analysis, including non-coding regions, is necessary to fully understand the genetic underpinnings of autism across different populations.

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As genetic databases expand to include more diverse genomes, the potential for improved genetic counseling and precision medicine for autism increases. The researchers advocate for ongoing efforts to sequence the DNA of underrepresented populations, which will enhance the understanding of neurodevelopmental conditions and ensure equitable healthcare access.

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• “These findings provide a road map for improving genetic diagnosis across ancestral groups,” — Joseph D. Buxbaum, Director, Seaver Autism Center for Research and Treatment

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• “Expanding genomic research in underrepresented populations is essential to reducing health disparities and advancing precision medicine for autism and related conditions across all ancestral populations.” — Joseph D. Buxbaum, Director, Seaver Autism Center for Research and Treatment

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