The main fear in almost every family that deals with an autistic child is the probability that all siblings will have the disease. The fear is compounded as the exact cause of the disease is unknown. The anxiety of parents to have two autistic children in their family can be over-bearing most of the times!
Researchers and scientists blame genes, gene mutations, a poor immune system, environmental factors and defects in development, vaccines, heavy metal preservatives used in vaccines, food allergies and several other reasons for causing the disease. There are good chances that succeeding siblings could also have the disease as almost all autism is supposed to have an unspecified genetic component.
A combination of genes with environmental factors is supposed to cause the variation in symptoms seen in the same family and in all patients. But recent research has provided some hope for parents. According to researchers at the Cold Spring Harbor Laboratory, Long Island, New York, (Source- Sebat J, Lakshmi B, et al. "Strong association of de novo copy number mutations with autism." Science. 2007 Apr 20;316(5823):445-9) recent studies have proved that at least 15% of autistic children have independent genetic mutations which were not present in their parents.
There is a high chance that almost all autism cases arise because of combination of hereditary and environmental factors that cause the disorder. Therefore from all the information gathered, the two simple facts are :
- Genes and environmental factors combine to create Autism.
- If you already have a child with autism, then there is a chance that succeeding children will be autistic.