CHRFAM7A and schizophrenia: Sinkus and colleagues [9] reported that despite the deleted CHRFAM7A allele being more frequent in Caucasians than in African-Americans, its presence is significantly associated with schizophrenia in both ethnic groups, but the number of CHRFAM7A alleles [8], and the presence of at least one copy of the deleted allele [113,117], is sufficient to have a P50 sensory gating deficit.