Enables transcription coactivator activity. Acts upstream of or within regulation of transcription, DNA-templated. Part of transcription regulator complex. Is expressed in several structures, including cranial ganglion; submandibular gland primordium; testis; tooth; and vibrissa. Human ortholog(s) of this gene implicated in autosomal dominant nonsyndromic deafness 75. Orthologous to human TRRAP (transformation/transcription domain associated protein). [provided by Alliance of Genome Resources, Apr 2022]