Genetics as a cause of autism?

Just to set the record straight - it really isn't as simple as there being one single cause of autism. Instead, the causes are as varied and diverse as the individuals who have it! A combination of vulnerable genetics and environmental factors, in varying degrees are responsible. It is why there is such a massive spectrum of symptoms. 

When I hear people talking about autism as purely a genetic condition, I feel saddened. The reason for this is that the statement by itself, without the proper understanding of genetic interactions, leads one to a place of no hope. 'If genes are responsible, what can I do, because I can't change genetics, ' kind of thing. 

It is very important to understand that your child's genetic destiny is not fixed like we once thought. Whilst your actual genes can't be changed, the way that they are EXPRESSED can be. 

The genes in our bodies are like DNA blueprints. They are a preset program, but can be affected by the environment. Much like when building a house, there will be a standard set of blueprints containing windows and a door. The type of door and windows selected will be impacted by the environment. Source 

What changes or mutates a gene is the signal it receives.

1. Trauma: via the nervous system. 

2. Toxins: chemicals of any kind

3. Mind: wrong signals are sent at the wrong times and create dysfunction and disease. 

If you are looking at autism as purely genetic, what a glorious thought that enriches us with hope that our children can actually have a better quality of life purely by changing their environment! 

Source: Book - Naturally Recovering Autism: by Karen Thomas