Autism: insights from molecular genetics

Since Kanner's seminal work in 1943, our understanding of autism has expanded significantly. While genetics plays a significant role, environmental factors also contribute, often in correlation with genetic predispositions. For instance, a mother's genetic background may influence prenatal environmental exposures linked to autism risk.

In the last decade, molecular genetic research on autism has surged, particularly through genome-wide studies. These efforts aim to identify specific genetic variants associated with autism spectrum disorders (ASD), with a focus on rare variants, like de novo mutations, which offer insights into the disorder's biology and pathogenesis. However, rare variants do not act alone but interact with numerous other genes and variants. Researchers are now exploring how different gene variants converge on common gene expression and protein networks, identifying key biological pathways underlying autism. This involves studying their impact on various brain cell types, locations across the brain, and developmental stages. Bioinformatic tools facilitate inferring gene variant functions, streamlining research efforts.

Despite the complexity posed by multiple autism risk genes, experts are optimistic about systems biology approaches. By examining the convergence of genes, proteins, cells, circuits, and behaviors associated with autism, researchers aim to uncover crucial biological insights. While challenges remain, these approaches hold promise for understanding the intricate biology of autism spectrum disorders.