are people with autism more prone to psychoticism?

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As with other dopamine receptor subtypes, the D4 receptor is activated by the neurotransmitter dopamine. It is linked to many neurological and psychiatric conditions including schizophrenia, Parkinsons disease, bipolar disorder, addictive behaviors including sex addiction, and eating disorders such as anorexia nervosa, bulimia nervosa and binge eating.

The 'DRD4 long' variant, or more specifically the 7 repeat (7R), has been loosely linked to a susceptibility for developing ADHD[8] and other psychological traits and disorders, like autism and bulimia nervosa[9]

7R appears to react less strongly to dopamine molecules.[10].