SLC29A3 and H syndrome: Loss-of-function mutations in SLC29A3 cause monogenic diseases, including H syndrome, Faisalabad histiocytosis, pigmented hypertrichosis with insulin-dependent diabetes mellitus syndrome, and familial Rosai-Dorfman disease (Cliffe et al., 2009; Molho-Pessach et al., 2008; Morgan et al., 2010).