Breakthrough in Autism Research
Scientists have made a significant breakthrough by identifying dozens of genetic traits that could help pinpoint who is at risk of developing autism. This discovery comes from one of the largest studies of its kind, where researchers in New York analyzed genetic data from more than 15,000 individuals across North, Central and South America, including 4,700 people diagnosed with autism.
The study linked 35 genes to the condition, which the research team believes could serve as a ‘road map’ for diagnosis. While these genes were not new, this study was unique because it focused on people of Latin American ancestry—a genetically diverse group made up of indigenous American, West African and European genetics. Unlike previous studies that mainly looked at European populations, this research provided new insights into the genes associated with autism in non-European populations, helping doctors improve detection methods.
Autism is typically diagnosed through an in-person evaluation, but genetic tests can also be used to detect autism-linked genetic changes or rule out other conditions. Dr Joseph Buxbaum, an autism expert at Mount Sinai involved in the research, emphasized that the findings indicate the core genetic architecture of autism is shared across different ancestries. He stated, “This suggests that the biology underlying autism is universal and reinforces the importance of ensuring that diverse populations are represented in genetic research.”
He added, “These findings provide a road map for improving genetic diagnosis across ancestral groups. Expanding genomic research in under-represented populations is essential to reducing health disparities and advancing precision medicine for autism and related conditions across all ancestral populations.”
The Study and Its Impact
The research, published in Nature Medicine, was conducted by the Genomics of Autism in Latin American Ancestries (GALA) Consortium, a collaborative effort compiling genetic data on Latin American individuals. Participants were diagnosed with autism based on expert clinical evaluations using the Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5). This standard definition identifies autism as a condition characterized by persistent difficulties in communication and social interaction.
The DSM-5 includes deficits in social-emotional responses, such as failing to respond to one’s name, avoiding eye contact during conversations, and lacking facial expressions. It also covers challenges in developing, maintaining, and understanding relationships, such as difficulties in sharing imaginative play. Experts note that the definition encompasses individuals with classic autism, those with Asperger’s Syndrome—who often have good language skills but struggle with social cues—and those with milder communication difficulties.
From the dataset, researchers analyzed information on 18,000 genes and identified patterns that linked changes in 35 genes to a higher risk of being diagnosed with autism. These genes are often associated with how the brain functions and tend to remain relatively unchanged across populations over time. Among them are PACS1, which codes for a protein that facilitates transport in the brain, and YWHAG, which codes for a protein vital for brain development.
Closing a Research Gap
Scientists believe the results help close a significant research gap, as only a few studies have previously analyzed genes linked to autism in non-European groups. This study highlights the importance of including diverse populations in genetic research to ensure equitable healthcare outcomes.
Autism rates have increased in the United States in recent years, with an estimated one in 31 children now living with the condition, compared to one in 150 in 2000. Overall, 5.4 million Americans are estimated to be affected by autism. While the reasons for the rise are not fully understood, experts suggest that increased awareness and the expansion of the autism definition to include milder cases have contributed to the surge.
There is currently no cure for autism, but treatment focuses on supporting a patient’s learning, development, and behavior. Early diagnosis and intervention are crucial, as they can help patients develop essential social, communication, and behavioral skills.
