RNA-binding protein involved in pre-mRNA splicing (PubMed:19641227). Interacts with the PRP19C/Prp19 complex/NTC/Nineteen complex which is part of the spliceosome (PubMed:19641227). Involved in regulating splice site selection (PubMed:19641227). Binds preferentially RNA with A/C rich sequences and poly-C stretches (PubMed:23144703). {ECO:0000269|PubMed:19641227, ECO:0000269|PubMed:23144703}. This is the function of KHDC4 (KH domain containing 4, pre-mRNA splicing factor, ENSG00000132680).