The function of Ensembl gene identifier ENSG00000138433 (CIRSR, corepressor of RBPJ and splicing regulator) is as follows. May modulate splice site selection during alternative splicing of pre-mRNAs (By similarity). Regulates transcription and acts as corepressor for RBPJ. Recruits RBPJ to the Sin3-histone deacetylase complex (HDAC). Required for RBPJ-mediated repression of transcription. .