該基因編碼腺病毒E1A相關的細胞p300轉錄輔激活蛋白。作為組蛋白乙酰轉移酶，通過染色質重塑調節轉錄，在細胞增殖和分化過程中起重要作用。通過與磷酸化CREB蛋白特異性結合來介導cAMP基因調控。該基因也被鑒定為HIF1A（缺氧誘導因子1α）的共激活物，因此在缺氧誘導基因如VEGF的刺激中起到作用。這種基因的缺陷是魯賓斯坦-泰比綜合征的原因，也可能在上皮癌中起作用。
This gene encodes the adenovirus E1A-associated cellular p300 transcriptional co-activator protein. It functions as histone acetyltransferase that regulates transcription via chromatin remodeling and is important in the processes of cell proliferation and differentiation. It mediates cAMP-gene regulation by binding specifically to phosphorylated CREB protein. This gene has also been identified as a co-activator of HIF1A (hypoxia-inducible factor 1 alpha), and thus plays a role in the stimulation of hypoxia-induced genes such as VEGF. Defects in this gene are a cause of Rubinstein-Taybi syndrome and may also play a role in epithelial cancer.
