Study Links Autism to the Y Chromosome

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New research analyzing more than 177,000 patients suggests the Y chromosome may increase autism risk.

Scientists have found a potential new explanation for why autism affects boys at nearly four times the rate of girls: the male sex chromosome itself may increase the risk.

In a new study published in Nature Communications analyzing data from more than 177,000 patients, researchers found that individuals with an extra male sex chromosome, or the Y chromosome, were twice as likely to be diagnosed with autism spectrum disorder (ASD), while extra X chromosomes showed no such effect.

Understanding ASD and Sex Chromosomes

ASD is characterized by challenges in social interaction, communication, and behavior patterns, with boys being at significantly greater risk than girls. The reasons behind this disparity have long intrigued researchers.

โ€œA leading theory in the field is that protective factors of the X chromosome lower autism risk in females,โ€ Matthew Oetjens, an assistant professor at Geisingerโ€™s Autism & Developmental Medicine Institute and co-author of the study, said in a statement.

To investigate the role of sex chromosomes in autism risk, Oetjens and his team analyzed data from 177,416 patients involved in the Simons Foundation Powering Autism Research (SPARK) study, an initiative dedicated to funding and advancing autism research, and the Geisinger College of Health Sciences MyCode Community Health Initiative, a large-scale genetic research project.

Among these patients, 350 had abnormal sex chromosomes. Their research specifically focused on people with sex chromosome aneuploidy, a genetic condition characterized by an abnormal number of X or Y chromosomes.

Male Chromosomes and Autism Risk

โ€‹The researchers found that individuals with an extra X chromosome (XXY) did not exhibit an increased risk for ASD.โ€‹ However, those with an additional Y chromosome (XYY) were twice as likely to be diagnosed with ASD. This suggests that there is a risk factor specifically associated with the Y chromosome, rather than any protective effect related to the X chromosome.

โ€œHowever, further research is needed to identify the specific risk factor associated with the Y chromosome,โ€ Alexander Berry, a staff scientist at Geisinger and co-author of the study, said in a statement.

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