Association of autism severity with a monoamine oxidase A functional polymorphism.

http://gene.sfari.org/autdb/TableDetails.do?tableName=AUT_CANDIDATE_GENES&keyVal=MAOA

Brunner Syndrome: also known as MAO-A deficiency, this rare disease is well-studied.
The deficient MAO-A (monoamine oxidase A) fails to mop up neurotransmitters after use.
People with Brunner's syndrome are mildly mentally retarded and have extremely dangerous behavior swings in response to mood changes.
It is very rare, causes mild mental retardation, and is X-linked.
A related gene is under study for its role in stress and bipolar disorder..

Aggressive behavior and altered amounts of brain serotonin and norepinephrine in mice lacking MAOA.

I tryed to start a new thread on this.
But it would not submit on new topic.
I wonder why some child improve so well and some don't.
As autism is a symptom rather then a condition which I believe is mostly caused/triggered by heavy metal toxic exposures..
And then theirs aggressive types of autism..
Children can be different with autism.
Some more mellow some not.
Depends on ones biological makeup in relation to the cause.
And what each autistic child may lack/need to improve..
Of what has been harmed.
In their biological makeup.