http://leftbrainrightbrain.co.uk/2011/07/lack-of-association-between-autism-and-four-heavy-metal-regulatory-genes/?utm_source=twitterfeed&utm_medium=twitter"One question that has been discussed for some time is the hypothesized role of mercury as a potential cause of autism. The basic idea is that administrative prevalences of autism went up coincident with increases in mercury exposure from vaccines. Plus, it was asserted that autism symptoms are similar to the symptoms (they aren’t).
Part of the mercury model held that there could be a genetic susceptibility to mercury in a subset of children.
Researchers at Vanderbilt University have explored the question by testing autistics for genes involved in how the body processes mercury. They did not find any link between the four genes they screened and autism.
Of course one could argue that some other gene or genes are important. One would then need to explain why mercury exposure from vaccines does not increase the risk of autism.
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FYI...