BTBD9 and alcohol dependence: Three SNPs on Chromosome 6, rs4141854, rs9394515, and rs4711553 are all located in the BTBD9 gene, and have significant maternally derived effect on alcohol dependence, where the corresponding p-values at these three SNPs are respectively 2.797×10−11, 2.797×10−11 and 2.790×10−11.