该基因编码剪接因子3a蛋白复合物的一个亚单位剪接因子3A异三聚体是成熟的U2小核核糖核蛋白颗粒（SNRNP）的组成部分。u2小核核糖核蛋白在剪接体组装和前mrna剪接中起关键作用。

This gene encodes a subunit of the splicing factor 3a protein complex. The splicing factor 3a heterotrimer is a component of the mature U2 small nuclear ribonucleoprotein particle (snRNP). U2 small nuclear ribonucleoproteins play a critical role in spliceosome assembly and pre-mRNA splicing.