Predicted to contribute to GTPase activator activity. Acts upstream of or within circulatory system development and roof of mouth development. Predicted to be located in lysosomal membrane. Predicted to be part of GATOR1 complex. Is expressed in several structures, including genitourinary system; heart; liver; lung; and spleen. Human ortholog(s) of this gene implicated in focal epilepsy. Orthologous to human NPRL3 (NPR3 like, GATOR1 complex subunit). [provided by Alliance of Genome Resources, Apr 2022]