Required for pre-mRNA splicing. Represses the splicing of MAPT/Tau exon 10. May function as export adapter involved in mRNA nuclear export such as of histone H2A. Binds mRNA which is thought to be transferred to the NXF1-NXT1 heterodimer for export (TAP/NXF1 pathway); enhances NXF1-NXT1 RNA-binding activity. RNA-binding is semi-sequence specific (By similarity). Found in large molecular weight complexes containing CCNL1 and the p110 isoforms of either CDC2L1 or CDC2L2 (By similarity). Interacts with CCNL2 and CPSF6. Interacts with NXF1 (By similarity). Interacts with YTHDC1 (PubMed:29799838). Isoforms, lacking all or part of the RS domain, may be involved in modulating Srsf7 function. Extensively phosphorylated on serine residues in the RS domain. Belongs to the splicing factor SR family.