GALK1 and Charcot-Marie-Tooth disease type 4D: Moreover, several variants that cause rare diseases are unique to the Roma and have been only recently discovered: e.g., Charcot Marie Tooth disease type 4D and 4G (OMIM 601455 and 605,285), congenital cataract facial dysmorphism neuropathy (OMIM 604166), Gitelman syndrome (OMIM 263800), galactokinase deficiency (OMIM 230200), among others.