Component of the Integrator complex, a complex involved in the transcription of small nuclear RNAs (snRNA) and their 3'-box- dependent processing (PubMed:23097424). Involved in the 3'-end processing of the U7 snRNA, and also the spliceosomal snRNAs U1 and U5 (PubMed:23097424). Plays a role as a regulator of spermatogenesis (PubMed:19357193). Crucial regulator of the mitotic cell cycle and development (PubMed:15737938, PubMed:19357193). Required for the correct dynein-dynactin perinuclear localization important for nucleus- centrosome coupling that occur upon meiotic progression of primary spermatocytes (PubMed:19357193,PubMed:23904267). Plays a role in sperm motility and fertility (PubMed:19357193). May have a role in the PNG/PLU/GNU pathway (PubMed:15737938). {Experimental EvidencePubMed:15737938, Experimental EvidencePubMed:19357193, Experimental EvidencePubMed:23097424, Experimental EvidencePubMed:23904267}.