‐Inhibits ovarian granulosa cells proliferation in PCOS via DNMT1 downregulation‐In KGN cells‐lnc‐MAP3K13‐7:1 overexpression resulted in cell cycle arrest in the G0/G1 phase, as well as the molecular inhibition and genetic silencing of DNMT1. The gene discussed is MAP3K13; the disease is polycystic ovary syndrome.