The neurotrophic factor neuregulin 1 (NRG1), is a widely accepted schizophrenia susceptibility gene which plays a significant role in normal brain maturation by influencing neuronal migration, myelination, and synaptic plasticity (Pearce et al., 1987; McDonald and Johnston, 1990; Stefansson et al., 2002; Harrison and Law, 2006; Mei and Xiong, 2008; Barros et al., 2009; Bennett, 2009, 2011). This evidence concerns the gene NRG1 and schizophrenia.