According to published literature of microdeletions and rearrangements in the Xq28 region containing the MAMLD1-MTM1-MTMR1 genes [see Table 3 and [1, 2, 28–30]], which causes myopathy for the involvement of the MTM1 gene, it appears for the DSD phenotype that the C-terminal region of the MAMLD1 gene is critical for abnormal sex development [29]. This evidence concerns the gene MAMLD1 and disorder of sexual differentiation.