這個基因類似于果蠅的附加性梳基因，它編碼一種染色質結合蛋白，這是正常確定發育中胚胎的片段特性所必需的。該蛋白是多梳蛋白組的一員，是維持穩態和其他基因座穩定抑制所必需的。這種蛋白質被認為會破壞局部區域的染色質，增強某些基因的轉錄，同時抑制其他基因的轉錄。該基因編碼的蛋白與核受體輔活化子1協同作為維甲酸受體的配體依賴性輔活化子。該基因突變與骨髓增生異常綜合征和慢性骨髓單核細胞白血病有關。選擇性剪接導致多個轉錄變體。
This gene is similar to the Drosophila additional sex combs gene, which encodes a chromatin-binding protein required for normal determination of segment identity in the developing embryo. The protein is a member of the Polycomb group of proteins, which are necessary for the maintenance of stable repression of homeotic and other loci. The protein is thought to disrupt chromatin in localized areas, enhancing transcription of certain genes while repressing the transcription of other genes. The protein encoded by this gene functions as a ligand-dependent co-activator for retinoic acid receptor in cooperation with nuclear receptor coactivator 1. Mutations in this gene are associated with myelodysplastic syndromes and chronic myelomonocytic leukemia. Alternative splicing results in multiple transcript variants.
