In general, the majority of genetic studies have failed to find a straightforward association between MAOA and schizophrenia (Coron et al., 1996; Sasaki et al., 1998; Syagailo et al., 2001; Norton et al., 2002; Iwata et al., 2003; Li and He, 2008; Wei et al., 2011). The gene discussed is MAOA; the disease is schizophrenia.