Predicted to enable GTP binding activity and GTPase activity. Predicted to act upstream of or within signal transduction. Predicted to be located in Golgi membrane. Human ortholog(s) of this gene implicated in several diseases, including Costello syndrome; autistic disorder; carcinoma (multiple); epidermal nevus; and large congenital melanocytic nevus. Orthologous to human HRAS (HRas proto-oncogene, GTPase).