Netic overlap between schizophrenia and bipolar disorder (Lichtenstein et al., 2009; Van Snellenberg de Candia, 2009) However, while genetic factors are involved in both disorders, risk genes which have been identified account for a small portion of disease risk. For example, a recent genome wide study in schizophrenia found 108 independent loci that account for approximately 7 of the risk of d