SP4 and bipolar disorder: On the other hand, the human SP4 gene has been mapped to chromosome 7p15, where a susceptibility locus was suggested for a broad spectrum of human psychiatric disorders, including schizophrenia [8], [9], [10], panic disorder [11], [12], ADHD [13], autism [14], [15], [16], [17], and bipolar disorder [18], [19], [20].