GRM1 and schizophrenia: To this regard, is should be considered that NRG1 and ErbB receptors represent candidate susceptibility genes for schizophrenia (Mei and Nave, 2014), which has been also linked to an aberrant mGluR1 functioning (Gupta et al., 2005; Lesage and Steckler, 2010; Volk et al., 2010; Ayoub et al., 2012; Herman et al., 2012).