Predicted to enable mannosyltransferase activity. Predicted to be located in membrane. Predicted to be active in endoplasmic reticulum membrane. Is expressed in adult head; anterior midgut primordium; embryonic/larval midgut; organism; and posterior midgut primordium. Human ortholog(s) of this gene implicated in spermatogenic failure 9. Orthologous to several human genes including DPY19L1 (dpy-19 like C-mannosyltransferase 1).