Doctors assert that autism has genetic causes, which are the major cause of the disease. Although autistic genes are complex, it is difficult to explain the disease through mutations that appear, either rarely, or through rare interactions that are usually multi-genetic, , The complexity of interaction between multiple genes, and also because of the unchanging genetic factors, and the environment, but these genes are inherited and thus affect what is called gene expression.
Some of the doctors studied the case of twins. It was found that 0.6 hereditary intervention in autism and 0.9 genetics intervention in the autism spectrum. The study showed that siblings of patients with autism were 25 times more likely to develop the disease However, most of the mutations that lead to the disease have not yet been determined.
Most doctors believe that the cause of autism is not known to be the so-called chromosomal abnormality, which is known as the migraine mutation. It is also not recorded that the hereditary syndrome associated with HIV / AIDS is related to autism as a cause, Several evidence suggests that the underlying cause of autism is the result of an imbalance in what is known as neurotransmitters. It was found that mutations may lead to autism, and this is the breakdown of paths (nerve clamps), for example mutations that concern the cell and its connections.
A team of doctors have conducted studies on switching genes with mice. The symptoms of the disease have been closely linked to the subsequent developmental relationship, which is related to neurotransmitters, as well as to the activity associated with independent cells. The factors that would To cause these malformations and disease begin activity during the first weeks of pregnancy, to show that during the early stage of development, autism is formed.
Some studies have found that the environment has a strong relationship with autism, especially foods eaten by parents or child nutrition, as well as odors such as chlorine, phenols, plastics and solvents, vaccines, and pesticides.