A new study in Molecular Biology and Evolution reveals fascinating insights into why Autism Spectrum Disorder (ASD) might be linked to how humans evolved.
Currently, about 1 in 31 children in the U.S. is diagnosed with ASD, and worldwide, the World Health Organization estimates that 1 in 100 children is affected. Researchers believe that autism, along with schizophrenia, may be distinctly human traits, as we rarely see similar behaviors in other primates. These conditions relate closely to advanced cognitive abilities like language, which are much more developed in humans.
Advancements in single-cell RNA sequencing have helped scientists identify various neuron types in the brain. Studies show that the mammalian brain has a wide range of these cell types, and large-scale sequencing has uncovered unique genetic changes in humans that didn’t evolve significantly in other mammals.
Researchers have looked into cross-species single-nucleus RNA sequencing from different areas of the mammalian brain. They found that certain neurons in humans evolved more rapidly compared to other primates. This quick evolution coincided with significant changes in genes associated with autism, likely driven by natural selection.
While we see evidence of natural selection favoring autism-related genes, the reason behind this advantage isn’t fully understood. It’s challenging to pinpoint which unique features of human cognition and brain structure provided an edge to our ancestors.
Some experts suggest that the genes linked to autism may be responsible for slower brain development in humans compared to chimps. This slower growth could have allowed for more complex thinking and advanced language skills, traits essential for human survival and collaboration.
Lead researcher Alexander L. Starr mentioned, “Our results suggest that the same genetic changes making the human brain unique also contribute to our neurodiversity.” This statement highlights a captivating aspect of human development—our diversity in cognitive styles may have played a role in our evolutionary success.
Understanding how these genes shaped human capability sheds light on the broader conversation about neurodiversity, emphasizing that variations in the human mind can be part of what makes our species thrive.
For further reading on autism’s prevalence and advancements in research, you can check the latest report from the CDC here.
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