這個基因編碼一種具有一個SAP結構域的蛋白質。這種蛋白結合十字形和超螺旋DNA，誘導陽性的超螺旋形成閉合的環狀DNA，并參與在mRNA處理過程中的剪接位點選擇。涉及該區域的染色體畸變、該基因的表達增加以及抗該蛋白抗體的存在都與各種疾病有關。兩個編碼不同亞型的轉錄變體已經被發現。
This gene encodes a protein with one SAP domain. This protein binds to cruciform and superhelical DNA and induces positive supercoils into closed circular DNA, and is also involved in splice site selection during mRNA processing. Chromosomal aberrations involving this region, increased expression of this gene, and the presence of antibodies against this protein are all associated with various diseases. Two transcript variants encoding different isoforms have been found for this gene.