The LD patterns of DLG4 in the studied populations were comparable to the reference populations in the HapMap database [Figure 1 (a–h)]. The SNPs rs17203281, rs390200, rs222853 and rs222837 formed a LD block in Japanese population [Figure 1 (e, f)]. However the LD pattern in the Chinese population differed from that of Japanese, where the variant rs2242449 along with other SNPs formed a LD block [Figure 1 (g)]. Haplotype analysis of the other candidate genes also yielded no significant association with schizophrenia (Tables S6, S7 and S8 in File S1). Here, DLG4 is linked to schizophrenia.