Autism spectrum disorder does not have a single, identifiable cause — and new research continues to confirm that reality. Scientists have identified a range of genetic, biological, and environmental factors that influence early brain development, but no one element explains the full picture. Understanding what the evidence actually shows is essential, as oversimplified claims can mislead families and shape harmful public debate.
En bref
- —No single gene or factor causes autism
- —60–90% chance both identical twins share ASD diagnosis
- —Brain differences linked to ASD begin before birth
Hundreds of genes linked to ASD, but no single culprit
Genetics remain the strongest and most consistently documented factor in autism research. Hundreds of genes have been identified as linked to ASD, many of them directly involved in how neurons communicate, how synapses form, and how brain connectivity develops in early life.
