NRG1 and schizophrenia: For instance, while some candidate gene studies reported the association of neuregulin-1 DNA variants with schizophrenia (for example [6]) and a genome-wide linkage analysis highlighted a candidate region for schizophrenia that includes the neuregulin-1 gene [7], several genome-wide association studies highlighted genes other than neuregulin-1 to be involved in schizophrenia (for example [8,9]).