Enables mRNA binding activity. Acts upstream of or within several processes, including blastocyst development; regulation of mRNA export from nucleus; and stem cell division. Located in nucleus. Is expressed in early conceptus and inner cell mass. Human ortholog(s) of this gene implicated in X-linked intellectual disability-short stature-overweight syndrome. Orthologous to human THOC2 (THO complex 2). [provided by Alliance of Genome Resources, Apr 2022]