학술논문
Targeting Menin disrupts the KMT2A/B and polycomb balance to paradoxically activate bivalent genes
Document Type
Original Paper
Author
Sparbier, Christina E.; Gillespie, Andrea; Gomez, Juliana; Kumari, Nishi; Motazedian, Ali; Chan, Kah Lok; Bell, Charles C.; Gilan, Omer; Chan, Yih-Chih; Popp, Sarah; Gough, Daniel J.; Eckersley-Maslin, Melanie A.; Dawson, Sarah-Jane; Lehner, Paul J.; Sutherland, Kate D.; Ernst, Patricia; McGeehan, Gerard M.; Lam, Enid Y. N.; Burr, Marian L.; Dawson, Mark A.
Source
Nature Cell Biology. 25(2):258-272
Subject
Language
English
ISSN
1465-7392
1476-4679
1476-4679
Abstract
Precise control of activating H3K4me3 and repressive H3K27me3 histone modifications at bivalent promoters is essential for normal development and frequently corrupted in cancer. By coupling a cell surface readout of bivalent MHC class I gene expression with whole-genome CRISPR–Cas9 screens, we identify specific roles for MTF2–PRC2.1, PCGF1–PRC1.1 and Menin–KMT2A/B complexes in maintaining bivalency. Genetic loss or pharmacological inhibition of Menin unexpectedly phenocopies the effects of polycomb disruption, resulting in derepression of bivalent genes in both cancer cells and pluripotent stem cells. While Menin and KMT2A/B contribute to H3K4me3 at active genes, a separate Menin-independent function of KMT2A/B maintains H3K4me3 and opposes polycomb-mediated repression at bivalent genes. Release of KMT2A from active genes following Menin targeting alters the balance of polycomb and KMT2A at bivalent genes, facilitating gene activation. This functional partitioning of Menin–KMT2A/B complex components reveals therapeutic opportunities that can be leveraged through inhibition of Menin.
With whole-genome screens using a bivalent MHC class I gene expression readout, Sparbier et al. identify opposing roles for Menin and KMT2A/B in modulating activating H3K4me3 versus repressive H3K27me3 at bivalent promoters to regulate gene activation.
With whole-genome screens using a bivalent MHC class I gene expression readout, Sparbier et al. identify opposing roles for Menin and KMT2A/B in modulating activating H3K4me3 versus repressive H3K27me3 at bivalent promoters to regulate gene activation.