DISC1 and psychiatric disorder: The relevance of DISC1 to mental illness in the wider population remains a matter for fierce debate (Porteous et al., 2014; Sullivan, 2013), but functional studies have demonstrated that DISC1 has important roles in embryonic and adult neurogenesis (Chandran et al., 2014; Duan et al., 2007; Mao et al., 2009; Namba and Kaibuchi, 2010).