Involved in modulating alternative pre-mRNA splicing with either 5' distal site activation or preferential use of 3' proximal site. In case of infection by Herpes simplex virus (HSVI), may act as a splicing inhibitor of HSVI pre-mRNA.
Subcellular locations: Nucleus, Nucleolus, Nucleus speckle
Isoforms 3 and 7 were identified in brain, pancreas, prostate, and testis, but little or no message could be detected in other tissues.