Most of the proteins acetylated by EP300, such as hypoxia-inducible factor 1α (HIF1α), TP53, STAT3, RELA, MYB, NFKB1, FOXO1, MYOD1, and GATA factors (16), have been demonstrated to play crucial roles in PAH (17), implying EP300 might participate in PAH occurrence. Here, HIF1A is linked to pulmonary arterial hypertension.