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. Interacts with ARL6 (By similarity). Interacts with ZCCHC17. Interacts with SRSF2. Isoforms 3 and 7 were identified in brain, pancreas, prostate, and testis, but little or no message could be detected in other tissues. Expressed only in G1/S phase. In case of Herpes simplex virus (HSVI)-binding to cells. Partially edited. In the brain, edited at about 68%. Belongs to the ARL6IP4 family. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus.