Involved in pre-mRNA splicing as component of the spliceosome (PubMed:11991638, PubMed:28502770, PubMed:28076346). Identified in the spliceosome C complex (PubMed:11991638, PubMed:28502770, PubMed:28076346). Interacts with CCNDBP1 (PubMed:11118353). Abundantly expressed in the heart, skeletal muscle and kidney. Expressed at lower level other tissues. Belongs to the SYF2 family.