Acts upstream of or within U2 snRNA 3'-end processing; inner cell mass cell proliferation; and negative regulation of cysteine-type endopeptidase activity involved in apoptotic process. Located in nucleus. Is expressed in early conceptus. Human ortholog(s) of this gene implicated in neurodevelopmental disorder with cataracts, poor growth, and dysmorphic facies. Orthologous to human INTS1 (integrator complex subunit 1). [provided by Alliance of Genome Resources, Apr 2022]