Epigenetic regulation of asymmetric cell division by the LIBR-BRD4 axis

• Published in: Nucleic acids research 2024-01, Vol.52 (1), p.154-165
• Main Authors: Chen, Hsiao-Fan, Chang, Chia-Ting, Hsu, Kai-Wen, Peng, Pei-Hua, Lai, Joseph Chieh-Yu, Hung, Mien-Chie, Wu, Kou-Juey
• Format: Article
• Language: English
• Subjects: Asymmetric Cell Division; Cell Cycle Proteins - genetics; Cell Cycle Proteins - metabolism; Epigenesis, Genetic; Gene regulation, Chromatin and Epigenetics; Nuclear Proteins - metabolism; RNA, Long Noncoding; Transcription Factors - metabolism
• ISSN: 0305-1048; 1362-4962
• DOI: 10.1093/nar/gkad1095

Abstract Asymmetric cell division (ACD) is a mechanism used by stem cells to maintain the number of progeny. However, the epigenetic mechanisms regulating ACD remain elusive. Here we show that BRD4, a BET domain protein that binds to acetylated histone, is segregated in daughter cells together with H3K56Ac and regulates ACD. ITGB1 is regulated by BRD4 to regulate ACD. A long noncoding RNA (lncRNA), LIBR (LncRNA Inhibiting BRD4), decreases the percentage of stem cells going through ACD through interacting with the BRD4 mRNAs. LIBR inhibits the translation of BRD4 through recruiting a translation repressor, RCK, and inhibiting the binding of BRD4 mRNAs to polysomes. These results identify the epigenetic regulatory modules (BRD4, lncRNA LIBR) that regulate ACD. The regulation of ACD by BRD4 suggests the therapeutic limitation of using BRD4 inhibitors to treat cancer due to the ability of these inhibitors to promote symmetric cell division that may lead to tumor progression and treatment resistance. Graphical Abstract Graphical Abstract