ATP7A and occipital horn syndrome: Genetic variants of ATP7A are responsible for multiple diseases with neurologic and neuromuscular symptoms including Menkes disease (MD; OMIM 309400), occipital horn syndrome (OHS; OMIM 304150), and X-linked distal motor neuropathy (SMAX3, OMIM 300489) (Kaler, 2011; Tumer, 2013).