LRRTM1 and schizophrenia: Yet, to date, only few specific genes have been suggested as candidates influencing handedness: Francks et al. (2007) reported evidence for the involvement of the imprinted gene leucine-rich repeat transmembrane neuronal 1 (LRRTM1) on chromosome 2p12 in the development of schizophrenia/schizoaffective disorder and human handedness [12].